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Добірка наукової літератури з теми "Amine solvents"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Amine solvents"

Liu, Xiangwei, Qian Ao, Shengyou Shi, and Shuie Li. "CO₂ capture by alcohol ammonia based deep eutectic solvents with different water content." Materials Research Express 9, no. 1 (January 1, 2022): 015504. http://dx.doi.org/10.1088/2053-1591/ac47c6.

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Abstract The existing CO2 absorption by deep eutectic solvents is limited by the unavoidable water absorption problem during use. In this study, we prepared three deep eutectic solvents with different alcohol aminations and added different water contents to discuss the effect of water content on the absorption of carbon dioxide by deep eutectic solvents. All deep eutectic solvents have a low melting point at room temperature as a liquid and have high thermal stability, where the choline chloride-diethanolamine deep eutectic solvents have a high viscosity. Anhydrous choline chloride-monoethanolamine deep eutectic solvents have the largest CO2 absorption, reaching 0.2715 g g−1, and the absorption of CO2 by anhydrous choline chloride-N-methyldiethanolamine deep eutectic solvents is only 0.0611 g g−1. Water content inhibited the absorption of CO2 in primary amine and secondary amine systems, whereas it enhanced the absorption of CO2 in tertiary amine systems, which was related to the reaction process of deep eutectic solvent and CO2.

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Agarwal, Neha, Le Cao Nhien, and Moonyong Lee. "Rate-Based Modeling and Assessment of an Amine-Based Acid Gas Removal Process through a Comprehensive Solvent Selection Procedure." Energies 15, no. 18 (September 18, 2022): 6817. http://dx.doi.org/10.3390/en15186817.

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In this study, an industrial acid gas removal (AGR) process which uses amine-based solvents was designed and simulated. The selection of suitable absorbents is crucial for an effective AGR process. Therefore, various single and blended amine-based solvents for capturing acid gases were evaluated through a comprehensive procedure, including solvent screening and process design steps. First, various solvents were screened for their CO2 and H2S absorption efficiencies. Promising solvents were then selected for the process design step, in which all process alternatives were simulated and rigorously designed using Aspen Plus. The non-equilibrium rate-based method with an electrolyte non-random two-liquid thermodynamic model was employed for modeling the absorption column. All processes were evaluated in terms of energy requirements, costs, and carbon emissions. The results show that a blend of methyldiethanolamine and piperazine solutions are the most promising solvents for the AGR process, as they can save up to 29.1% and 30.3% of the total annual costs and carbon emissions, respectively, compared to the methyldiethanolamine + diethanolamine solvent process.

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Vijayaraghavan, Ranganathan, and Douglas R. MacFarlane. "Charge Transfer Polymerization in Ionic Liquids." Australian Journal of Chemistry 57, no. 2 (2004): 129. http://dx.doi.org/10.1071/ch03236.

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Charge transfer (CT) polymerization of methyl methacrylate has been successfully carried out by employing n-butyl amine and carbon tetrachloride as CT initiators and hydroquinone as promoter in room-temperature ionic liquids (ILs) as solvents. The reaction rate and polymer yields at short reaction times are enhanced in the IL solvent compared to conventional solvents. The effect of various reaction conditions including concentration of amine, IL, and temperature have been studied. The polymers were characterized for thermal and molecular weight properties and compared with the conventional CT reaction.

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Hasegawa, Miki, Yasunori Yamada, Ken-ichi Kumagai, and Toshihiko Hoshi. "Electronic Structure of 2,6-Bis{.N-(2-hydroxyphenyl)immoinethyl}-4-methylphenol." Zeitschrift für Naturforschung B 54, no. 7 (July 1, 1999): 929–39. http://dx.doi.org/10.1515/znb-1999-0717.

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The electronic and molecular structure of 2,6-bis{N-(2-hydroxyphenyl)iminomethyl}-4- methylphenol (hpimp) is clarified from the measurements of electronic absorption and 1H NMR spectra in various solvents and an X-ray diffraction analysis, together with MO calculations. Electronic absorption bands of hpimp are at 422, 397.9, 359, 341, 294.3, 265.8, and 224 nm in the non-polar solvent cyclohexane. In polar solvents, such as methanol, an additional band which is assigned to a partly formed keto-amine hpimp, is observed at 499 nm. From the 1H NMR spectra it is seen that hpimp exists in the enol-imine form in non-polar solvents, and as an equilibrium mixture of enol-imine and keto-amine forms in polar solvents. Each electronic absorption band of solid hpimp in a KBr disk is broadened compared with the solution state, and an additional band, again assigned to the keto-amine form, appears around 499 nm. An X-ray diffraction analysis shows that hpimp assumes a keto-amine structure in the solid state, and forms a column structure along the c-axis. MO calculations suggest that the enol-imine hpimp has a twist structure around the two C−C single bonds, the twist angle being 100° to 120°.

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Saeed Alshahrani. "Amino silicones solvent advantages to capture CO2 and improve plant sustainability." World Journal of Advanced Engineering Technology and Sciences 8, no. 1 (February 28, 2023): 277–81. http://dx.doi.org/10.30574/wjaets.2023.8.1.0053.

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Results for novel amino silicone physical properties to capture carbon dioxide (CO2) were discussed in this article, that also investigated their potential economic benefits versus traditional amine solvents, such as monoethanolamine (MEA). A range of differing amino silicone solvents were tested for density, viscosity, vapor pressure, and heat value. The novel amino silicone solvents showed better results than conventional solvents for CO2 removal, demonstrating less density, lower vapor pressure, and reduced heat capacity. These advantages were also translated into economic benefits with respect to capital expenditure (CAPEX) and operation expenditure (OPEX).

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Luu, Xuan Dinh, Thanh Thuy Nguyen, Ba Thuan Le, and Mai Huong Le Thi. "Separation of Th from leachate of monazite sulphation process using amine solvent extraction." Nuclear Science and Technology 8, no. 1 (September 1, 2021): 44–49. http://dx.doi.org/10.53747/jnst.v8i1.83.

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The solvent extraction is one of the most common method for separating Th from solution. Primary amine has higher selectivity for the extraction of Th(IV) than U(VI) and RE(III) in sulfate media. N1923 (a primary aliphatic amine with amino nitrogen linked to a secondary carbon consisting of branched alkyl groups in C19–23 range) is commonly used to extractTh. At room temperature using 0.1M N1923 amine as solvent in this work, the results showed thatthorium maximum extraction capacity was about 2.5g/L with concentration of sulfuric acid in the aqueous phase was 1M and for 3 minutes shaking. At room temperature for 3 minutes shaking the best conditions for scrubbing processwas using the mixture of acids H2SO4 0.2M and HNO3 0.1M, result inover 75%, Th was scrubbed in the aqueous phase only 0.7%. The separation of Th from leachate of monazite sulphation process was carried out on a multistage continuous flow extraction device (12 boxes), the thorium purity was 98%. Therefore, the use of amine solvents can purify thorium from rare-earth solutions in a sulfate medium

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Chen, Francis M. F., Young Lee, Rene Steinauer, and N. Leo Benoiton. "Mixed anhydrides in peptide synthesis. A study of urethane formation with a contribution on minimization of racemization." Canadian Journal of Chemistry 65, no. 3 (March 1, 1987): 613–18. http://dx.doi.org/10.1139/v87-105.

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A study of the factors contributing to urethane formation during the coupling of N-alkoxycarbonylamino acids with an amino acid ester by the mixed carboxylic–carbonic acid anhydride method has been carried out, using nuclear magnetic resonance spectroscopy and high-performance liquid chromatography for the quantitation of products. Urethane formation is associated primarily with reactions of activated hindered residues such as isoleucine and N-methylamino acids. Of prime importance in dictating the amount of urethane generated is the tertiary amine/solvent combination. N-Methylpiperidine/dichloromethane is the best combination for minimizing urethane formation, N-methylmorpholine/tetrahydrofuran is a good combination, while triethylamine/dichloromethane is a particularly bad one. In dimethylformamide, the differences between these amines are marginal. Aqueous dimethylformamide is a good solvent for mixed anhydride generation and coupling. A small excess of substrate reduces the amount of urethane. Less racemization accompanies the coupling of peptide acids in tetrahydrofuran than in halogen-containing solvents, N-methylpiperidine being the superior base in these solvents, but not in dimethylformamide. Racemization is reduced by one half when menthyl chloroformate instead of isobutyl chloroformate is used in the couplings.

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Raksajati, Anggit, Minh Ho, and Dianne Wiley. "Solvent Development for Post-Combustion CO2 Capture: Recent Development and Opportunities." MATEC Web of Conferences 156 (2018): 03015. http://dx.doi.org/10.1051/matecconf/201815603015.

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Chemical absorption is widely regarded as the most promising technology for post-combustion CO2 capture from large industrial emission sources with CO2 separation from natural gas using aqueous amine solvent system having been applied since the 1930s. The use of monoethanolamine (MEA) in CO2 absorption system possesses several drawbacks, such as high regeneration energy, high solvent loss, and high corrosion tendency. Various solvents have been developed for post-combustion CO2 capture application including the development of aqueous solvents and phase-change solvents. Some of these alternate solvents have been reported to have better solvent properties, which could improve the CO2 absorption system performance. This paper reviews key parameters involved in the design improvement of several chemical absorption process systems. In addition, some novel solvent systems are also discussed, for example encapsulated solvents systems. Some of the key solvent parameters that affect the capture performance, such as heat of reaction, absorption rate, solvent working capacity, solvent concentration, and solvent stability, are discussed in this paper, particularly in relation to the economic viability of the capture process. In addition, some guidelines for the future solvent development are discussed.

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Li, Peng, and Huanrong Li. "Amine vapor responsive lanthanide complex entrapment: control of the ligand-to-metal and metal-to-metal energy transfer." Journal of Materials Chemistry C 4, no. 11 (2016): 2165–69. http://dx.doi.org/10.1039/c5tc04377h.

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We develop a luminescent platform based on Eu³⁺ and Tb³⁺ co-doped nanozeolite to realize the probing of amine solvents. Such a luminescence sensor can classify amine solvents and achieve an excellent fingerprint correlation between the amine solvents (with larger pK_a values) and the emission intensity ratio (I_Eu/I_Tb), which is ratiometric.

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Wilson, Aaron D., and Frederick F. Stewart. "Structure–function study of tertiary amines as switchable polarity solvents." RSC Adv. 4, no. 22 (2014): 11039–49. http://dx.doi.org/10.1039/c3ra47724j.

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A series of tertiary amines have been screened for their function as switchable polarity solvents (SPS). The relative ratios of tertiary amine and carbonate species as well as maximum possible concentration were determined. A new form of SPS with an amine : carbonate ratio significantly greater than unity has been identified. The N,N-dimethyl-n-alkylamine structure has been identified as important to the function of an SPS.

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Дисертації з теми "Amine solvents"

Garcia, Ortega Monica. "Theoretical and experimental study on novel amine and hybrid solvents for CO2 capture." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/844875/.

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An introduction and overview of the work is given in Chapter 1. In Chapter 2, a description of the equipment and the kinetics modelling used in this thesis is explained in detail. Chapter 3 includes an overview of traditional solvents and shows the kinetics and mass transfer results of the absorption of CO2 in amine solvents. Chapter 4 starts with a literature review on organic solvents and hybrid solutions (organic-amine aqueous solutions) and includes the mass transfer and kinetic results of the absorption of CO2 in selected hybrid solvents containing amines. Chapters 3 and 4 sum up the 11 solutions tested for the absorption of CO2 and include their physical characterization (density, viscosity and N2O solubility), at unloaded and loaded conditions and from 298 to 353K. Chapter 5 is focused on the thermodynamic modelling of new amine solvents in ASPEN PLUS and Chapter 6 includes the modelling at pilot plant scale of absorber and desorber. Every chapter includes conclusions and final remarks are given at the end of this thesis. Chapter 7 presents the conclusions of the whole thesis and recommendations for future work.

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Wang, Nan. "CO2 Separation - from Aqueous Amine Solvent to Ionic Liquid-based solvent." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84244.

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Blasucci, Vittoria Madonna. "Organic solvents for catalysis and organic reactions." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31723.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2010.
Committee Chair: Charles Eckert; Committee Co-Chair: Charles Liotta; Committee Member: Amyn Teja; Committee Member: Christopher Jones; Committee Member: William Koros. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Lukhezo, Muchinyarawo. "Reactive solvent extraction of amino acids." Thesis, London South Bank University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245090.

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Moreira, Roger Cardoso. "Desenvolvimento de metodologia para separação de aminas quaternárias utilizando eletroforese não aquosa em microssistemas." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/5899.

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This study describes the development of an analytical methodology for the separation of quaternary amines using nonaqueous electrophoresis microchips coupled with capacitively coupled contactless conductivity detection (C4D). Initially, preliminary experiments were performed to evaluate two electrokinetic modes for sample introduction on chip, known as gated and floating approaches. Gated injection showed repeatability slightly better than floating mode. In addition, it also provided better analytical responses on the C4D system. During the development of analytical methodology for NAME-C4D, the electrolyte composition was optimized to ensure satisfactory separations on electrophoresis microchips. The electrolyte composed of sodium deoxycholate (NaDCHA) at concentration of 10 mmol/L dissolved in a mixture of MeOH/ACN at the ratio 90:10 (v/v) exhibited separations with high efficiency and resolution above 1. Then, it was realized the optimization of potential injection, separation and detection parameters (frequency and amplitude). Running electrolyte was prepared in both DMSO and DMF, however, the use of a mixture containing MeOH/ACN provided best analytical performance. The best results were obtained with electrolyte containing 10% ACN and 90% MeOH. In addition, different electrolyte compositions were also evaluated, but the electrolyte containing NaDCHA offered results slightly better when compared to others. The optimization of running buffer allowed the separation of nine quaternary amines in electrophoresis channels with effective length of 7.0 cm with analysis time lower than 120 s. The peak resolution was higher than 1 and the calculated separation efficiencies ranged from 77.000 to 185.000 pratos/m. This excellent performance was achieved using NAME conditions under high electric fields. The developed methodology was used for the analysis of quaternary amines in samples containing high salinity levels through the standard addition method. Linear correlation coefficients were obtained up to 0,990 for eight quaternary amines. Lastly, the use of NAME-C4D allowed to observe a strong dependence of the detector response according to the carbon number of quaternary amine molecules.
O presente trabalho descreve o desenvolvimento de uma metodologia analítica para separação de aminas quaternárias utilizando eletroforese não aquosa em microchips (NAME, do inglês non-aqueous microchip electrophoresis) com detecção condutométrica sem contato acoplada capacitivamente (C4D, do inglês capacitively coupled contactless conductivity detection). Inicialmente foi realizado um estudo para avaliação de dois modos de introdução da amostra nos microchips, denominados de gated e floating. O modo gated apresentou repetitividade ligeiramente melhor que o modo floating, além de proporcionar melhores respostas do detector C4D. No desenvolvimento da metodologia utilizando NAME-C4D, foi realizado um estudo para encontrar a composição ideal do eletrólito para as separações eletroforéticas. O eletrólito constituído de deoxicolato de sódio (NaDCHA), na concentração de 10 mmol/L, dissolvido em uma mistura de MeOH/ACN na proporção 90:10 (v/v), apresentou separações com alta eficiência e resolução superior a 1. A partir de então, foi realizada a otimização dos potenciais de injeção, separação e dos parâmetros de detecção (frequência e amplitude). Durante o desenvolvimento da metodologia, foram avaliados eletrólitos preparados em outros dois solventes, DMSO e DMF. Porém, a mistura de MeOH/ACN como solvente forneceu os melhores resultados, desta maneira também foi avaliada a adição de diferentes proporções de MeOH/ACN. Os melhores resultados foram obtidos com o eletrólito contendo 10% de ACN e 90% de MeOH. Na sequência, foram avaliadas diferentes composições do eletrólito, com a adição de outros compostos em substituição ao NaDCHA. Todos os eletrólitos avaliados apresentaram ótimas separações, porém o eletrólito com NaDCHA apresentou resultados ligeiramente superiores. Com a otimização da metodologia desenvolvida, obteve-se separações eletroforéticas de nove aminas quaternárias em microssistema contendo comprimento efetivo de 7,0 cm, com um tempo de análise inferior a 120 s. As separações apresentaram resolução superior a 1 e valores de eficiência entre 77,000 e 185,000 pratos/m, uma vez que com a utilização de solventes orgânicos, foi possível a aplicação de campos elétricos elevados. A metodologia desenvolvida foi avaliada através da determinação das aminas quaternárias, pelo método de adição de padrão, em uma matriz com elevada salinidade. Foram obtidos coeficientes de correlação lineares acima de 0,990 para oito aminas quaternárias. Durante o desenvolvimento do trabalho, foi observada uma clara dependência das respostas analítica em função da quantidade de carbono da molécula.

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Fichera, Alfio. "Syntheses of triflu[o]romethyl-containing amino acids and development of catalysts capable of hydrolyzing the D-Ala-D-Lac depsipeptide /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2004.

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Thesis (Ph.D.)--Tufts University, 2004.
Adviser: Krishna Kumar. Submitted to the Dept. of Chemistry. Includes bibliographical references (leaves 190-197). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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Howell, Bill. "Physical and chemical aspects of the solvent extraction of uranium by a tertiary amine." Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/4574.

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Law, Gim Hoong Erica. "Mutational analysis of solvent-exposed amino acids in Photinus pyralis luciferase." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615816.

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Qureshi, Numan. "Conducting tests of immobilized enzyme, Omega-transaminase with organic solvent." Thesis, KTH, Skolan för bioteknologi (BIO), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-163668.

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Britto, Patrícia Fonseca de [UNESP]. "Adsorção de íons Cu(II) sobre superfícies de sílicas gel modificadas com 4-amino-2-mercaptopirimidina e com 2-mercaptopirimidina." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/92017.

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A combinação de diferentes tipos de materiais para obtenção de novas propriedades tem despertado grande interesse em vários campos da ciência de materiais. Em processos de separação, é de considerável interesse o uso de materiais com propriedades básicas extremamente diferentes. Entre os suportes mais usados está a sílica gel, um material com tamanho de partículas e porosidade bem definidas, elevada área superficial, e estabilidades mecânica, química e térmica elevadas. Neste contexto, a sílica gel modificada com grupos organofuncionais pode ser utilizada para a adsorção de íons metálicos em soluções aquosas e não aquosas, pré-concentração e separação de íons metálicos. Neste trabalho, a sílica gel 60 (Merck), com tamanho de partículas entre 0,2 e 0,05 mm e área superficial específica de 486 m2.g-1, foi quimicamente modificada em duas etapas. Primeiro, a sílica gel foi quimicamente modificada com 3-cloropropiltrimetoxisilano, resultando o 3-cloropropil sílica gel (CPSG). Na segunda etapa, o produto resultante, CPSG, reagiu com 2-mercaptopirimidina e 4-amino-2-mercaptopirimidina, resultando os materiais sólidos 2-mercaptopirimidina-propil sílica gel (MPSG) e 4-amino-2-mercaptopirimidinapropil sílica gel (AMSG). As quantidades de grupos funcionais conectados na superfície da sílica gel, N0, foram 7,007 x 10-4 mols e 7,416 x 10-4 mols de moléculas por grama de sílica, para MPSG e AMSG, respectivamente. Conhecendo a área superficial específica e assumindo que as moléculas cobrem uniformemente a superfície, a densidade média, d, das moléculas ancoradas e a distância intermolecular média, l, podem ser calculadas aplicando as equações d = N0 N/SBET e l = (l/d) 1/2 , onde N é o número de Avogadro. Os valores calculados são d = 1,42 moléculas.nm2 e l = 0,979 nm, e d = 1,166 moléculas.nm2 e l = 0,926 nm, para MPSG e... .
The combination of different type of materials for achieving novel properties has always been of high interest in many fields of the materials sciences. The use of materials with extremely different basic properties, like organic and inorganic compounds, is of considerable interest in separation processes. Among the supports the most used is silica gel, a material of well-established particle sizes and well-define porosity, high surface area, and high mechanical, chemical, and thermal stability. In this context, silica gel modified with organofunctional groups has been used for adsorption of metal ions from aqueous and non-aqueous solutions, pre-concentration and separation of metallic ions. In this work, silica gel 60 (Merck) having secondary particles sized between 0,2 and 0,05 mm and specific surface area of 486 m2.g-1 was modified using a two step approach. First, the silica gel was chemically modified with 3- chloropropyltrimetoxysilane, resulting the 3-chloropropyl-silica gel (CPSG). Second, the resultant product, CPSG, reacted with 2-mercaptopyrimidine and 4-amino-2- mercaptopyrimidine, resulting the solid materials 2-mercaptopyrimidine-propyl-silica gel (MPSG) and 4-amino-2-mercaptopyrimidine-propyl-silica gel (AMSG). The quantities of functional groups attached on the silica gel surface, No, were 7,007 x 10-4 mols e 7,416 x 10-4 mols .g-1 of molecules per gram of silica, for MPSG and AMSG, respectively. It being known the specific surface area and assuming that the molecules uniformly cover the surface, the average density, d, of the attached molecules and the average intermolecular distance, l, can be calculated by applying the equations: d = N0 N /SBET and l = (l/d)1/2, where N is Avogadro's number. The calculated values were d = 1,042 molecules.nm-2 and l = 0,979 nm and d = 1,166 molecules.nm-2 and... (Complete abstract click electronic address below).

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Книги з теми "Amine solvents"

Leslie, Young Colin, Fogg P. G. T, Clever H. Lawrence, and Hayduk Walter, eds. Ammonia, amines, phosphine, arsine, stibine, silane, germane and stannane in organic solvents. Oxford: Pergamon, 1985.

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Liu, Helei. Post-combustion CO2 Capture Technology: By Using the Amine Based Solvents. Springer, 2018.

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Young, C. L., and P. G. T. Fogg. Ammonia, Amines, Phosphine, Arsine, Stibine, Silane, Germane and Stannane in Organic Solvents: Ammonia, Amines, Phosphine and Arsine in Organic Solvents. Elsevier Science & Technology Books, 2013.

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Krittanai, Chartchai. Helical propensity of amino acids changes with solvent environment. 1997.

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Ammonia, Amines, Phosphine, Arsine, Stibine, Silane, Germane and Stannane in Organic Solvents. Elsevier, 1985. http://dx.doi.org/10.1016/c2009-0-01218-5.

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Young, Colin L. Ammonia, Amines, Phosphine, Arsine, Stibine, Silane, Germane and Stannane in Organic Solvents (Solubility Data Series). Elsevier Science Publishing Company, 1985.

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Shields, Andrew, Corinne Varron, Eugenie Charriere-Peroud, Pierre Ardaud, Jean-Marie Bernard, Mike Cowley, Thierry Jeanette, et al. Polyurethanes: Waterborne & Solvent Based Surface Coating Resins and Their Applications (Wiley/Sita Series in Surface Coatings Technology). John Wiley & Sons, 1999.

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Частини книг з теми "Amine solvents"

Liu, Helei, Raphael Idem, and Paitoon Tontiwachwuthikul. "Solvent Property of Amine Based Solvents." In SpringerBriefs in Petroleum Geoscience & Engineering, 7–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00922-9_2.

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Coulier, Yohann, Yohann Coulier, Yohann Coulier, Elise El Ahmar, Jean-Yves Coxam, Jean-Yves Coxam, Elise Provost, et al. "New Amine Based Solvents for Acid Gas Removal." In Carbon Dioxide Capture and Acid Gas Injection, 127–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118938706.ch7.

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Goto, K., S. Kodama, H. Okabe, and Y. Fujioka. "Energy Performance of New Amine-Based Solvents for CO2Capture from Blast Furnace Gas." In ACS Symposium Series, 317–31. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1097.ch017.

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Tao, Zuyi. "Ion-Exchange Equilibria of Amino Acids." In Ion Exchange and Solvent Extraction, 353–79. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003208846-8.

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Ohtake, Satoshi, Yoshiko Kita, Kouhei Tsumoto, and Tsutomu Arakawa. "Solvent Interactions with Proteins and Other Macromolecules." In Amino Acids, Peptides and Proteins in Organic Chemistry, 277–360. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527631841.ch9.

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Ihara, Yoshinori, Shinji Kurose, and Takashi Koyama. "Extraction of Unprotected Amino Acids by Mixed-Ligand Nickel(II) and Copper(II) Chelates." In Highlights in Solute-Solvent Interactions, 197–202. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-6151-7_10.

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Mahi, Mohammed-Ridha, Mohammed-Ridha Mahi, Ilham Mokbel, Latifa Négadi, and Jacques Jose. "CO2 Capture Using Deep Eutectic Solvent and Amine (MEA) Solution." In Cutting-Edge Technology for Carbon Capture, Utilization, and Storage, 309–16. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119363804.ch21.

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McFerran, Neil, Fiona Scott, and Brian Walker. "Amino acid activation: Solvent composition for monitoring reaction progress." In Peptides 1992, 296–97. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1470-7_123.

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Patel, Fenil, Umang Sutariya, Anirban Dey, Bharti Saini, and Sweta Balchandani. "Exploration of Amine Based Nanofluids as a Potential Solvent for Post-combustion CO2 Capture." In Energy, Environment, and Sustainability, 187–204. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8599-6_8.

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Yao, Jing, Rosalind M. Wharf, and Gregory R. Choppin. "Solvent Extraction of Eu(III) and Am(III) with Thio and Amide Extractants." In Separations of f Elements, 31–42. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1406-4_4.

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Тези доповідей конференцій з теми "Amine solvents"

Ribeiro, Mariana Araújo de Assis, Fernando Luiz Pellegrini Pessoa, and Ewerton Emmanuel da Silva Calixto. "COMPARISON AMONG GROUP CONTRIBUTION METHODS FOR AMINE SOLVENTS." In VII Simpósio Internacional de Inovação e Tecnologia. São Paulo: Editora Blucher, 2021. http://dx.doi.org/10.5151/siintec2021-205983.

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IKPEZE, Victoria Kamnetochi, John Olusoji OWOLABI, Idowu Iyabo OLATEJU, and Abdulwahab GIWA. "Modelling and Simulation of Acid Gas Absorption from Natural Gas by Amine Solution Using Aspen HYSYS." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/207183-ms.

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Abstract This work has been carried out to model and simulate a typical acid gas absorption process using Aspen HYSYS process simulator. The chemical components involved in the process development were water, methane, ethane, propane, higher alkanes, carbon dioxide, hydrogen sulphide, nitrogen and amines: monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA) and methyldiethanolamine (MDEA). The fluid package selected for the simulation before entering the simulation environment was Acid Gas – Chemical Solvents. In the simulation environment, the model was developed by picking an absorber from the Model Palette, placing it and assigning the input and the output streams involved before inputting the parameters required for model convergence. The carbon dioxide-rich feed gas was made to enter the absorber at the bottom inlet stream while the lean amine stream entered at the top inlet and showered down on the uprising gas thereby trapping the carbon dioxide molecules within the gas. The top product from the absorber was the treated gas while the amine solution and the trapped carbon dioxide left the absorber as the bottom product. Different simulations were run to investigate the performance of the amines under the same operating conditions. It was discovered that, of all the four amine solvents considered in this work for the removal of carbon dioxide by chemical absorption, MEA had the highest efficiency but would require more dehydration because it had the highest water content. DEA was also found to scrub the carbon dioxide down to acceptable levels. However, TEA and MDEA barely scrubbed any carbon dioxide under these conditions, as their carbon dioxide compositions were found to be unacceptable. The analyses of the results obtained from the simulations indicated that Aspen HYSYS can be used to study the process of acid gas absorption successfully.

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Karunarathne, Sumudu, John Ikechukwu Okoro, Saroj Neupane, and Lars Erik Øi. "Density and viscosity correlations of aqueous solvents for amine-based CO2 capture." In 63rd International Conference of Scandinavian Simulation Society, SIMS 2022, Trondheim, Norway, September 20-21, 2022. Linköping University Electronic Press, 2022. http://dx.doi.org/10.3384/ecp192020.

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Density and viscosity data are essential in designing process equipment and process simulations in the amine-based CO2 capture process. In literature, semi-empirical and empirical correlations for density and viscosity were fitted to measured data available in the literature and the goodness of fit by calculating Average Absolute Relative Deviations (AARDs %) were examined. The correlations based on excess properties give insights on intermolecular interactions and packing efficiency in multicomponent liquid mixtures.In this study, correlations for density, excess density (ρE, ln(ρE)) viscosity and excess viscosity (ηE, ln(ηE)) were examined for binary aqueous mixtures (Monoethylethanolamine) EMEA (1) + H2O (2) and (Monoethylethanolamine) EMEA (1) + (Diethylethanol amine) DEEA (2) to represent the measured density and viscosity. The Redlich and Kister type polynomials were used to fit the excess properties and the goodness of fit was determined by calculating AARD%. The fitted experimental data at different mole fractions and temperatures were able to acquire a good accuracy. Highest deviation for density correlations of EMEA + DEEA mixtures was observed with AARD 0.135 % and AMD 2.98 kg·m-3. For the EMEA + H2O mixtures, the highest deviation was observed with AARD 0.23 % and AMD 8.38 kg·m-3. Viscosity correlations showed a highest deviation for the EMEA + DEEA mixtures in which AARD was 5.2 % and AMD was 1.2 mPa·s. For the EMEA + H2O mixtures, the highest deviation observed with AARD was 1.1% and AMD was 0.75 mPa·s.McAllister’s kinematic viscosity model is a semi-empirical model based on Eyring’s theory for viscosity. The kinematic viscosity data were fitted to McAllister’s three-body model to investigate whether the suggested intermolecular interactions in the model are capable of describing the nature of the binary mixtures. The results indicated a good agreement between data and model with accuracies R2 = 0.99 and AARD 2% for EMEA + DEEA mixtures and AARD 6% for EMEA + H2O mixtures.

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Karunarathne, Sumudu, Jeanette Larsen, and Lars Erik Øi. "Mathematical Models for Physicochemical Properties of Different Amine-based Solvents in Post combustion CO2 Capture." In 63rd International Conference of Scandinavian Simulation Society, SIMS 2022, Trondheim, Norway, September 20-21, 2022. Linköping University Electronic Press, 2022. http://dx.doi.org/10.3384/ecp192021.

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In order to reduce global CO2 emissions, CO2 capture based on absorption in an amine/water mixture is an established method. To develop such processes, correct physicochemical properties like densities and viscosities are important.The first objective of this work is to explore mathematical correlations for fitting viscosity data for aqueous Monoethanolamine (MEA) and Methyldiethanolamine (MDEA). A second objective is to evaluate the prediction of viscosity based on parameters independent of viscosity measurements.13 developed correlations have been evaluated by comparing the maximum deviation of fitted models to the measured property, and by determining the average absolute relative deviation (AARD%). Python 3.6, MATLAB R2020b and Excel were used as the tools for regression.The results indicated that viscosity for aqueous amines was better correlated by Eyring’s viscosity model based on NRTL (Non-Random-Two Liquid model) rather than a Redlich-Kister correlation. The achieved AARD% of aqueous MEA were 2.39 for Redlich-Kister, 1.87 for Eyring-NRTL and 1.88 for the segment-based Eyring-NRTL model. The same trend was achieved for aqueous MDEA with AARD% of 3.04, 2.23 and 1.88 for different approaches.The possibility of using data from vapor/liquid equilibrium parameters to predict viscosity in MEA/water and MDEA/water was evaluated. Using parameters in the equilibrium model NRTL from the simulation program Aspen HYSYS in a model from Karunarathne indicated that it is possible to predict viscosity reasonably well without experimental viscosity data.

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Zhang, Zhien, Yunfei Yan, Junlei Wang, Li Zhang, Yanrong Chen, and Shunxiang Ju. "Analysis of CO2 Capture From Power-Plant Flue Gas Using the Membrane Gas Absorption (MGA) Method." In ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/power2015-49026.

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Currently membrane gas absorption (MGA) is a novel approach for gas separation. In the present work, a wide-ranging 2D mathematical model for CO2 absorption from the N2/CO2 mixture is proposed. Single solvents [H2O, ethylenediamine (EDA), diethanolamine (DEA), monoethanolamine (MEA), piperazine (PZ)] and blended solvents [DEA/PZ] were used as the absorbents. The non-wetting mode for the membrane contactor was considered in the calculations. The effects of gas concentration and velocity, and liquid concentration and velocity on CO2 removal were observed. The simulation results were verified with the experimental data showing a good agreement. The modeling results indicate that gas concentration and velocity have a negative effect on the capture process, while liquid concentration and velocity enhance CO2 capture. Also, it is noted that PZ has the best absorption performance than other single absorbents. The chemical solvents are much better than the physical solvent for the absorption of CO2. For mixed absorbents based on amine solutions, the CO2 removal efficiency could be about 20% higher than that of the single solutions. Thus, this model could provide the optimum operating conditions for acid gas absorption in the hollow fiber membrane module. It is also proved that the MGA approach exhibits a good potential in power-plant waste gas purification.

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Salais, Clément, Laurent Normand, and Christian Streicher. "Optimized CO2 Capture Solutions for Carbon Free Hydrogen Production with Development of New Demixing Solvent Technology DMX™." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207875-ms.

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Abstract CO2 capture & storage is foreseen as a necessity to limit global warming, as indicated by the recent reports from International Energy Agency. Major initiatives have to be initiated in a near future with concrete actions to get efficient results in limiting global warming. Based on its decades of experience in gas sweetening AXENS has developed an expertise in CO2 removal technologies. While conventional amine based processes can be used for some CO2 capture applications like for instance the treatment of process gas streams under pressure, other applications for low pressure gas streams like flue gases will require innovative advanced solutions. AXENS has studied various options for the removal of CO2 in SMR based hydrogen schemes, including the treatment of the process gas or the treatment of the flue gases from the SMR furnace, evaluating the respective merits of those options. For the treatment of the flue gases a new technology developed by IFPEN and AXENS based on a second generation amine solvent is considered : DMX™ DMX™ process, is foreseen as a key contributor for the removal of CO2 from all kind of low pressure gas streams. This process allows drastic reduction of CO2 capture cost in comparison to more conventional solvent such as MEA and others available solvents. The specific features of this solvent allows significant reduction of the heat requirements for the regeneration of the solvent. It also allows regenerating the solvent directly under pressure up to 6 bara, reducing the costs for downstream CO2 compression Preliminary techno-economic studies show significant advantage of DMX™ technology relatively to MEA : up to 30 % reduction in OPEX can be obtained for lower or similar CAPEX, depending on the condition. This process has been developed at the lab scale and is now going to be demonstrated in an industrial pilot unit installed in ArcelorMittal's steel mill plant in Dunkirk (France). This demonstration benefits from the support of EU's H2020 programme, under 3D project.

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Tola, Vittorio, and Matthias Finkenrath. "Low Temperature Heat Recovery Through Integration of Organic Rankine Cycle and CO2 Removal Systems in a NGCC." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20324.

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Reducing carbon dioxide (CO2) emissions from power plants utilizing fossil fuels is expected to become substantially more important in the near- to medium-term due to increasing costs associated to national and international greenhouse gas regulations, such as the Kyoto protocol and the European Union Emission Trading Scheme. However, since net efficiency penalties caused by capturing CO2 emissions from power plants are significant, measures to reduce or recover efficiency losses are of substantial interest. For a state-of-the-art 400 MW natural gas-fueled combined cycle (NGCC) power plant, post-combustion CO2 removal based on chemical solvents like amines is expected to reduce the net plant efficiency in the order of 9–12 percentage points at 90% overall CO2 capture. A first step that has been proposed earlier to improve the capture efficiency and reduce capture equipment costs for NGCC is exhaust gas recirculation (EGR). An alternative or complementary approach to increase the overall plant efficiency could be the recovery of available low temperature heat from the solvent-based CO2 removal systems and related process equipment. Low temperature heat is available in substantial quantities in flue gas coolers that are required upstream of the CO2 capture unit, and that are used for exhaust gas recirculation, if applied. Typical temperature levels are in the order of 80°C or up to 100 °C on the hot end. Additional low-grade heat sources are the amine condenser which operates at around 100–130 °C and the amine reboiler water cooling that could reach temperatures of up to 130–140°C. The thermal energy of these various sources could be utilized in a variety of low-temperature heat recovery systems. This paper evaluates heat recovery by means of an Organic Rankine Cycle (ORC) that — in contrast to traditional steam Rankine cycles — is able to convert heat into electricity efficiently even at comparably low temperatures. By producing additional electrical power in the heat recovery system, the global performance of the power plant can be further improved. This study indicates a theoretical entitlement of up to additional 1–1.5 percentage points in efficiency that could be gained by integrating ORC technology with a post-combustion capture system for natural gas combined cycles. The analysis is based on fundamental thermodynamic analyses and does not include an engineering- or component-level design and feasibility analysis. Different ORC configurations have been considered for thermal energy recovery at varying temperature levels from the above-mentioned sources. The study focuses on simultaneous low-grade heat recovery in a single ORC loop. Heat recovery options that are discussed include in series, in parallel or cascaded arrangements of heat exchangers. Different organic operating fluids, including carbon dioxide, R245fa, and N-butane were considered for the analysis. The ORC performance was evaluated for the most promising organic working fluid by a parametric study. Optimum cycle operating temperatures and pressures were identified in order to evaluate the most efficient approach for low temperature heat recovery.

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Sultani, Arianna, Michael Rogers, and Pedram Nasr. "Development of a Low-cost, Nano-fibrillar Xerogel Network Comprised of Cyclic-di-amino Acids." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/qguy6594.

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Peptides are a promising class of gelators and specifically, cyclic-di-amino acids (CdAA) have great versatility and biocompatibility due to their amino acid side chain diversity. This allows custom programing of the molecular motifs responsible for self-assembly. Six pairs of di-peptides were tested in 25 solvents, of which 16 combinations resulted in a gel. Each of the amino acids selected have unique properties in self-assembly and the 25 solvents represent a broad spectrum of solvent conditions, allowing the result to be extrapolated to untested solvents. The ability to self-assemble into fibrous structures requires a meticulous balance amongst opposing factors, including solubility and those that control growth into elongated aggregates/fibers. The fibrous inter-woven peptide nanofibers from self-assembled CdAA form enormous aspect ratio fibers. The crystal morphology of the resultant gels drastically varied, which is attributed to changes in the side chains, as well as the thermodynamic driving force, being either slow cooling or electrospinning (rapid solvent evaporation). As shown, phenylalanine and leucine when cyclized at a 2% wt in canola oil formed a fibrillar network. Fiber formation was characterized using atomic force, scanning electron, brightfield and polarized light microscopies, as well as X-ray diffraction. Additionally, the 16 gels were examined for fiber formation using Hansen Solubility parameters.

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Nagasawa, Yutaka, Arkadiy P. Yartsev, Keisuke Tominaga, and Keitaro Yoshihara. "Chemical Substitution and Deuterium Isotope Effects on Ultrafast Intermolecular Electron Transfer: Possible Role of Molecular Vibrations." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.fa.3.

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We have observed ultrafast non-exponential fluorescence quenching of 7-aminocoumarin dyes in electron donating solvents by means of femtosecond fluorescence up-conversion technique [1]. We regarded this fluorescence quenching as an ultrafast intermolecular electron transfer (ET) from the solvent to the excited dye. When the carbon chain on the amino group becomes longer, the rate of ET becomes slower, and when the amino group is fixed by hexagonal carbon ring, it becomes the slowest. Some of the fast reactions occur much faster than the diffusive solvent relaxation process. The fastest reaction with a time constant of ~200 fs was observed for coumarin 151 (C151) in N,N-dimethylaniline (DMA). In such a case, some dynamics faster than diffusive orientational polarization of the solvent is required to induce the reaction.

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Vital, Amber, Bradley Doleman, and Messiha Saad. "Thermophysical Properties of AS4/3501-6 Carbon-Epoxy Composite." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65186.

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As today’s technology continues to develop at a rate that was once unimaginable, the demand for new materials that will outperform traditional materials also increases dramatically. To meet these challenges, monolithic materials are being combined to develop new unique materials called composites. Thermophysical properties of composite materials such as thermal conductivity, diffusivity, specific heat, and thermal expansion are very important in engineering design process and analysis of aerospace vehicles as well as space systems. These properties are also important in power generation, transportation, and energy storage devices including fuel cells. Thermal conductivity is the property that determines the working temperature levels of a material and plays a critical role in the performance of materials in high temperature applications. This parameter is important in problems involving heat transfer and thermal structures. The objective of this paper is to develop a thermal properties database for the carbon-epoxy AS4/3501-6 composite. The AS4 carbon fiber used is a unidirectional continuous PAN based fiber, and the 3501-6 epoxy resin is amine cured and provides low shrinkage during the curing process while maintain resistance to chemicals and solvents. The thermophysical properties of the AS4 composite have been investigated using experimental methods. The flash method was used to measure the thermal diffusivity of the composite based on the American Society for Testing and Materials standard, ASTM E1461. In addition, the Differential Scanning Calorimeter was used in accordance with the ASTM E1269 standard to measure the specific heat. The measured thermal diffusivity, specific heat, and density were used to compute the thermal conductivity, thus adding to the currently insufficient database for composite materials and foams.

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Звіти організацій з теми "Amine solvents"

Winterhalter, C. Experimental Battledress Uniform Fabrics Made from Amine Oxide Solvent Spun Cellulosic Fibers. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada400546.

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Fisher, Kevin S., Katherine Searcy, Gary T. Rochelle, Sepideh Ziaii, and Craig Schubert. Advanced Amine Solvent Formulations and Process Integration for Near-Term CO2 Capture Success. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/945367.

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Lay, P. A., N. S. McAlpine, J. T. Hupp, M. J. Weaver, and A. M. Sargeson. Solvent-Dependent Redox Thermodynamics of Metal Amine Complexes. The Delineation of Specific Solvation Effects. Fort Belvoir, VA: Defense Technical Information Center, May 1991. http://dx.doi.org/10.21236/ada237503.

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Poole, Loree Joanne, and C. Judson King. Novel Regenerated Solvent Extraction Processes for the Recovery of Carboxylic Acids or Ammonia from Aqueous Solutions Part I. Regeneration of Amine-Carboxylic Acid Extracts. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/937438.

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Hefetz, Abraham, and Justin O. Schmidt. Use of Bee-Borne Attractants for Pollination of Nonrewarding Flowers: Model System of Male-Sterile Tomato Flowers. United States Department of Agriculture, October 2003. http://dx.doi.org/10.32747/2003.7586462.bard.

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The use of bee natural product for enhancing pollination is especially valuable in problematic crops that are generally avoided by bees. In the present research we attempted to enhance bee visitation to Male Sterile (M-S) tomato flowers generally used in the production of hybrid seeds. These flowers that lack both pollen and nectar are unattractive to bees that learn rapidly to avoid them. The specific objects were to elucidate the chemical composition of the exocrine products of two bumble bee species the North American Bombus impatiens and the Israeli B. terrestris. Of these, to isolate and identify a bee attractant which when sprayed on M-S tomato flowers will enhance bee visitation, and to provide a procedure of the pheromone application regime. During the research we realized that our knowledge of B. impatiens is too little and we narrowed the objective to learning the basic social behavior of the bees and the pattern of foraging in a flight chamber and how it is affected by biogenic amines. Colonies of B. impatiens are characterized by a high number of workers and a relatively small number of queens. Size differences between queens and workers are pronounced and the queen seems to have full control over egg laying. Only about 9% of the workers in mature colonies had mature oocytes, and there were no signs of a "competition phase" as we know in B. terrestris. Queens and workers differ in their exocrine bouquet. Queen's Dufour's gland possesses a series of linear, saturated and unsaturated hydrocarbons whereas that of workers contains in addition a series of wax-type esters. Bees were trained to either visit or avoid artificially scented electronic flowers in a flight chamber. Since bee also learned to avoid scented non-rewarding flowers we attempted to interfere with this learning. We tested the effect of octopamine, a biogenic amine affecting bee behavior, on the choice behavior of free-flying bumblebees. Our results show that octopamine had no significant effect on the bees' equilibrium choice or on the overall rate of the behavioral change in response to the change in reward. Rather, octopamine significantly affected the time interval between the change in reward status and the initiation of behavioral change in the bee. In B. terrestris we studied the foraging pattern of the bees on tomato flowers in a semi commercial greenhouse in Yad Mordechai. Bee learned very quickly to avoid the non- rewarding M-S flowers, irrespective of their arrangement in the plot, i.e., their mixing with normal, pollen bearing flowers. However, bees seem to "forget" this information during the night since the foraging pattern repeats itself the next morning. Several exocrine products were tested as visitation enhancers. Among these, tarsal gland extracts are the most attractive. The compounds identified in the tarsal gland extract are mostly linear saturated hydrocarbons with small amounts of unsaturated ones. Application was performed every second day on leaves in selected inflorescences. Bee visitation increased significantly in the treated inflorescences as compared to the control, solvent treated. Treatment of the anthers cone was more effective than on the flower petals or the surrounding leaves. Methanol proved to be a non-flower-destructive solvent. We have shown that bumble bees (B. terrestris) can be manipulated by bee-borne attractants to visit non-rewarding flowers. We have further demonstrated that the bees learning ability can be manipulated by applying exogenously octopamine. Both methods can be additively applied in enhancing pollination of desired crops. Such manipulation will be especially useful in tomato cultivation for hybrid seed production.

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