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Добірка наукової літератури з теми "Acid solutions"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 26 січня 2023

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Статті в журналах з теми "Acid solutions"

Pasenko, O., A. Mandryka, Ye Khrupchyk, and V. Vereshchak. "Stable solutions of orthosilicic acid." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 4 (July 2022): 56–60. http://dx.doi.org/10.32434/0321-4095-2022-143-4-56-60.

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Soluble silicon plays a significant role in living organisms. Orthosilicic acid is the only bioavailable form of silicon. Sodium silicate solutions with various silicate moduli and different types of acids were used in our work to investigate the effect of silicate modulus and types of acids on the stability of the solutions of orthosilicic acid. It was determined that both the silicate modulus and the type of acid have a certain impact on the stability of orthosilicic acid solution. The effect of sulfuric, hydrochloric, orthophosphoric and methanesulfonic acid on the stability of orthosilicic acid solutions was studied depending on the silicate modulus of sodium silicate. It was shown that in the following series of anions SO42–, Cl–, CH3SO3–, PO43–, the stability of orthosilicic acid solutions increases. In the following series of alkaline modulus 3.02, 2.72, 2.06, 1.96, the stability increases too. The use of orthophosphoric acid and liquid glass with a silicate modulus of 1.96 allowed obtaining a solution, which is stable for at least 40 days.

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Serheyev, Valentyn, Yuriy Kos, and Yuriy Van-Chin-Syan. "Thermodynamic Properties of Solutions of Ethacrylic Acid in Acetonitrile and Acetic Acid." Chemistry & Chemical Technology 9, no. 2 (May 15, 2015): 131–35. http://dx.doi.org/10.23939/chcht09.02.131.

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Park, Min Sun, Olof Heimbürger, Jonas Bergström, Jacek Waniewski, Andrzej Werynski, and Bengt Lindholm. "Peritoneal Transport during Dialysis with Amino Acid-Based Solutions." Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis 13, no. 4 (October 1993): 280–88. http://dx.doi.org/10.1177/089686089301300404.

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Objective To evaluate the potential clinical role of amino acids as an osmotic agent. Design The peritoneal transport of fluid, amino acids, and other solutes was investigated during a 6–hour single-cycle peritoneal dialysis with PDA 1% versus 1.36% glucose (n=6) or PDA 2.7% versus 3.86% glucose solution (n=9). Patients Fifteen stable nondiabetic continuous ambulatory peritoneal dialysis (CAPD) patients. Results The fractional absorption of the osmotic agents at 6 hours was higher with PDA 2.7% versus glucose 3.86% (p<0.005). The diffusive mass transport coefficient, KeD’ calculated for a period of dialysate isovolemia was higher with PDA 2.7% versus PDA 1% for essential, nonessential (p<0.005), and total (p<0.05) amino acids. The intraperitoneal volume-over-time curves and KqD values for urea, creatinine, glucose, albumin, β2microglobulin, and total protein did not differ between the amino acid solutions and the corresponding glucose solutions. KeD for urea was significantly higher during the dwell with PDA 2.7% versus PDA 1% (p<0.05). Plasma amino acid concentrations increased substantially during the first 1– 2 hours and then decreased gradually. Valine and methionine rose to 792% and 1119% of baseline values, respectively. Conclusions We conclude that the peritoneal transport of fluid and investigated solutes, except amino acids, was not different with the amino acid solutions compared with the corresponding equimolar glucose solutions. However, ultrafiltration tended to be lower with amino acid solutions. Furthermore, the fractional absorption of amino acids and KeD values for amino acids was higher with PDA 2.7% versus PDA 1 %, suggesting an effect of the hypertonic amino acid solution on the peritoneal membrane transport properties. Also, the hypertonic PDA2.7% solution yielded nonphysiologically high plasma levels of several amino acids. We therefore consider this solution not to be safe enough for long term clinical use.”

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Serheyev, Valentin, Yuri Kos, and Yuri Van-Chin-Syan. "Thermodynamic Properties of Solutions of the Acrylic Acid in 1,2-Dichloroethane and Acetic Acid." Chemistry & Chemical Technology 5, no. 2 (June 15, 2011): 123–27. http://dx.doi.org/10.23939/chcht05.02.123.

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Cheon, Eunjin, and Richard Mattes. "Fatty Acids Taste Intensity Ratings Before and After Sour Taste Adaptation." Current Developments in Nutrition 4, Supplement_2 (May 29, 2020): 742. http://dx.doi.org/10.1093/cdn/nzaa052_011.

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Abstract Objectives Recent research indicates that the taste quality of fatty acids, called ‘Oleogustus’, differs from the traditionally accepted five basic tastes. However, the actual quality of the sensation has not been characterized. One question is whether there is a sour component because very short-chain fatty acids, like acetic acid, the sour tastant in vinegar, is structurally a fatty acid. The present study investigated the quality sensation of fatty acids of graded chain length. Methods Sensory stimuli were acetic acid, butyric acid, hexanoic acid, octanoic acid, decanoic acid, lauric acid, oleic acid, and linoleic acid emulsions and palmitic acid, stearic acid powder. The intensity of the samples before and after expectorating was measured. Next, participants repeatedly sipped, held for 5 seconds, and expectorated a sour solution (0.09% w/w) and rated the intensity on a gLMS until the intensity was lower than “weak”. After adaption to the sour solution, the intensity of the sample was measured before and after expectorating. Participants recorded the quality of each sample. Results The intensity of acetic acid was significantly lower after adaptation (P < 0.04) that before adaptation and a similar trend was noted for butyric acid. The other fatty acids were not affected by adaptation. The intensities of all liquid samples except the octanoic acid solution showed a significant difference between before and after expectorating the samples. The intensities of acetic, butyric and hexanoic acids were lower after expectorating the samples than the intensities before expectorating the samples (P < 0.05) while the intensities of decanoic acid, lauric acid, oleic acid, and linoleic acid (P < 0.05) were lower after expectorating. There was no significant difference in intensity of the palmitic acid solution and the intensity of the stearic acid solution between before and after expectorating. Conclusions The results showed that fatty acids with chain lengths great than 4 have a unique taste other than the sourness. In addition, short-chain fatty acid solutions had higher intensity before expectorating the solutions while the medium- and long-chain fatty acid solutions had higher intensity after expectorating solutions, indicating that there is a different persistence time for fatty acid directly related to chain-length. Funding Sources This study has no sponsors.

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Tran, Anh T., Jay Tomlin, Phuoc H. Lam, Brittany L. Stinger, Alexandra D. Miller, Dustin J. Walczyk, Omar Cruz, Timothy D. Vaden, and Lei Yu. "Conductivity, Viscosity, Spectroscopic Properties of Organic Sulfonic Acid solutions in Ionic Liquids." ChemEngineering 3, no. 4 (October 1, 2019): 81. http://dx.doi.org/10.3390/chemengineering3040081.

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Sulfonic acids in ionic liquids (ILs) are used as catalysts, electrolytes, and solutions for metal extraction. The sulfonic acid ionization states and the solution acid/base properties are critical for these applications. Methane sulfonic acid (MSA) and camphor sulfonic acid (CSA) are dissolved in several IL solutions with and without bis(trifluoromethanesulfonyl)imine (HTFSI). The solutions demonstrated higher conductivities and lower viscosities. Through calorimetry and temperature-dependent conductivity analysis, we found that adding MSA to the IL solution may change both the ion migration activation energy and the number of “free” charge carriers. However, no significant acid ionization or proton transfer was observed in the IL solutions. Raman and IR spectroscopy with computational simulations suggest that the HTFSI forms dimers in the solutions with an N-H-N “bridged” structure, while MSA does not perturb this hydrogen ion solvation structure in the IL solutions. CSA has a lower solubility in the ILs and reduced the IL solution conductivity. However, in IL solutions containing 0.4 M or higher concentration of HTFSI, CSA addition increased the conductivity at low CSA concentrations and reduced it at high concentrations, which may indicate a synergistic effect.

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Boichenko, Alexander, Vadim Markov, Hoan Kong, Anna Matveeva, and Lidia Loginova. "Re-evaluated data of dissociation constants of alendronic, pamidronic and olpadronic acids." Open Chemistry 7, no. 1 (March 1, 2009): 8–13. http://dx.doi.org/10.2478/s11532-008-0099-z.

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AbstractThe dissociation constants of (4-amino-1-hydroxybutylidene)bisphosphonic (alendronic) acid, (3-(dimethylamino)-1-hydroxypropylidene)bisphosphonic (olpadronic) acid and (3-amino-1-hydroxypropylidene)bisphosphonic (pamidronic) acid were obtained in aqueous solutions (0.10 M KCl) and micellar solutions of cetylpyridinium chloride (0.10 M CPC) at 25.0°C. With the exception of the third dissociation constant of alendronic acid, the dissociation constants of alendronic, olpadronic and pamidronic acids in aqueous solutions matched literature data. The possibility of sodium alendronate determination by acid-base titration by NaOH solution was theoretically grounded on the basis of re-evaluated data of alendronic acid dissociation constants.

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Pilipenko, Alexei, Antonina Maizelis, Hanna Pancheva, and Yulia Zhelavska. "Electrochemical Oxidation of VT6 Titanium Alloy in Oxalic Acid Solutions." Chemistry and Chemical Technology 14, no. 2 (June 15, 2020): 221–26. http://dx.doi.org/10.23939/chcht14.02.221.

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Bessarab, O. V., T. F. Platonova, and I. V. Protunkevitch. "Modeling of the corrosion process in the interaction of tinplate with vegetable canned food." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 1 (July 18, 2019): 149–59. http://dx.doi.org/10.20914/2310-1202-2019-1-149-159.

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When choosing metal packaging for canned vegetables, it is advisable to take into account their corrosivity, because the inner surface corrosion is one of the factors affecting product quality during storage. To rationalize the corrosion tests of metal packaging materials, it is advisable to replace food with model media – organic acids solutions. The aim of this work was to study the corrosion kinetics of electrolytic tinplate in model media–aqueous solutions of oxalic (mass fraction 0.25–1.00%) and citric (mass fraction 0.25–1.50%) acids, as well as their compositions. The uniform corrosion rate was measured by the linear polarization resistance method, pitting corrosion–zero resistance amperometry method. The tests were carried out using the “Expert-004” corrosion-meter, according to a two-electrode scheme. For oxalic acid solutions with a mass fraction of 0.25% and 0.50% and for all citric acid solutions, the process is characterized as uniform corrosion – the pitting corrosion rates average steady values are 7–11 times less than the corresponding uniform corrosion rates values (1.52–3.93 µm/year and 17.42–26.56 µm/year, respectively). The most aggressive with respect to tinplate are oxalic acid solutions with a mass fraction of 0.25 and 0.50% and citric acid solutions with a mass fraction of 0.25 and 0.50%. On this basis, two-component solutions of the following composition were chosen: 0.25% citric acid + 0.25% oxalic acid; 0.25% citric acid + 0.50% oxalic acid; 0.50% citric acid + 0.25% oxalic acid; 0.50% citric acid + 0.50% oxalic acid. For these solutions, the process is characterized as uniform corrosion — the pitting corrosion rates average steady values are 7–10 times less than the corresponding the uniform corrosion rates values (2.04–3.85 ?m/year and 19.56–26.93 ?m/year, respectively). For two-component solutions, an additive effect is observed–the uniform and pitting corrosion rates average experimental steady values correspond to the calculated additive values. By mathematical processing of experimental data, it was found that the uniform corrosion steady rate maximum value the corresponds to a two-component solution containing 0.40% citric acid and 0.30% oxalic acid. This is confirmed by experimental data–the uniform corrosion rate average steady value for this solution is 28.18 ?m/year. According to the research results it was found that as a model corrosive medium that simulates canned vegetables, it is advisable to use a solution containing 0.40% citric acid and 0.30% oxalic acid, because it is the most aggressive.

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Bulstrode, C. J. K., A. W. Goode, and P. J. Scott. "A prospective controlled trial of topical irrigation in the treatment of delayed cutaneous healing in human leg ulcers." Clinical Science 75, no. 6 (December 1, 1988): 637–40. http://dx.doi.org/10.1042/cs0750637.

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1. Topical irrigation with normal saline is known to produce rapid healing in chronic leg ulcers. This study was designed to determine if the rate of healing could be improved by the addition of topical nutrition to the irrigating solution. 2. Forty-eight patients with chronic leg ulcers were admitted to hospital for a minimum of 6 weeks bed-rest. During this time the ulcers were continuously irrigated by one of four test solutions. The solutions were: normal saline; a dilute amino acid solution isotonic with the normal saline; a hyperosmolar saline solution; a hyperosmolar amino acid solution. There were 12 ulcers in each group. 3. The amino acid solutions produced significantly faster healing than the saline solutions (P < 0.01). Concentration had no significant effect on healing (P > 0.15). 4. The application of amino acids does appear to enhance healing in this model of delayed wound healing. This effect does not depend only on the osmolarity of the solution used.

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Більше джерел

Дисертації з теми "Acid solutions"

Vinichenko, N. O. "Acid rain. Problems and solutions." Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/45158.

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Acid rain refers to a relatively new phenomenon, a form of precipitation that is acidic in nature. The result of human-induced emissions, acid rain has grave effects on the planet's flora and fauna and different ecosystems. The precipitation occurs when exhaust emissions of sulfur and nitrogen compounds react in the atmosphere.

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Magalhães, Júnior Antonio Irineudo. "Recovery of itaconic acid from aqueous solutions." reponame:Repositório Institucional da UFPR, 2015. http://hdl.handle.net/1884/44013.

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Orientador : Prof. Dr. Julio Cesar de Carvalho
Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia de Bioprocessos e Biotecnologia. Defesa: Curitiba, 27/03/2015
Inclui referências : f. 79-83
Área de concentração: Agroindústria e biocombustíveis
Resumo: Ácido itacônico (AI) é um produto químico promissor que tem uma ampla gama de aplicações e pode ser obtido em grande escala por processos fermentativos. A separação de AI a partir do caldo fermentativo tem um impacto considerável no custo total da produção. Por conseguinte, a procura de processos para a recuperação de ácidos orgânicos com alta eficiência e baixo custo é um dos passos chave para a substituição de produtos de base petroquímica. Apesar dos avanços biotecnológicos em frente aos processos fermentativos, o principal obstáculo ainda é a separação e purificação. Uma revisão sobre os principais métodos de separação foi realizada nesse trabalho e fomentou as diretrizes dessa investigação. Um dos métodos mais comuns para a separação de ácidos orgânicos envolve a precipitação e ressolubilização (regeneração). Os estudos sobre a precipitação de AI são dificilmente encontrados na literatura, embora estejam bem desenvolvidos. Neste estudo, os dados da solubilidade de itaconato de cálcio foram determinados de modo a avaliar o potencial de precipitação de AI. O processo foi muito dependente da temperatura, com recuperação de 88 a 97% na faixa de 20 a 80°C. A separação de AI a partir de soluções aquosas usando resinas comerciais de troca iônica fortemente básicas foi outra investigação realizada. A adsorção foi investigada para determinar os efeitos da concentração inicial de AI, pH e temperatura. As isotermas clássicas de Freundlich e Langmuir e a cinética de pseudo-segunda ordem foram utilizadas para calcular os parâmetros de adsorção. Um modelo matemático simplificado foi desenvolvido e validado com dados experimentais de uma coluna de leito fixo. Durante os experimentos, um método analítico foi desenvolvido para a determinação da concentração de AI em solução aquosa. Palavras-chave: Recuperação de Ácidos Orgânicos, Ácido Itacônico, Análise, Precipitação, Adsorção.
Abstract: Itaconic acid (IA) is a promising chemical product, which has a wide range ofapplications and can be obtained in large scale by fermentative processes. Theseparation of IA from fermented broth has a considerable impact in the total cost ofproduction. In that way, the search for high efficiency and low cost processes oforganic acids recovery is one of the key steps to the replacement of petrochemicalbasedproducts. Despite the important biotechnological advances in fermentativeprocesses, the biggest remaining obstacles remain being the separation andpurification. In this work, a review of the main separation methods has been doneshowing that the most common methods of organic acids separation involvesprecipitation and regeneration. Studies about IA precipitation are rare in the literature.In this study, the data about calcium itaconate solubility were determined as a meansto evaluate IA precipitation potential. The process is dramatically dependent oftemperature, with recovering yields ranging from 88 to 97% at temperatures of 20 to80ºC. Another investigation made was the IA separation from aqueous solutionsusing strongly basic commercial ion-exchange resins. This adsorption method wasinvestigated in order to determine the effects of IA initial concentration, pH andtemperature. The classical isotherms of Freundlich and Langmuir and a pseudosecondorder kinetics were used to calculate the adsorption parameters. A simplifiedmathematical model was developed and evaluated with experimental data obtainedfrom a fixed bed column. During the experiments, an analytical method wasdeveloped to determine the concentration of IA in aqueous solution.Key words: Organic Acids Recovery, Itaconic Acid, Analysis, Precipitation,Adsorption.

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Fangelow, M. "Dimerisation of aleic acid in ionic solutions." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419519.

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Marti, Mustafa Esen. "Reactive Extraction Of Pyruvic Acid From Aqueous Single And Mixed Acid Solutions." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612261/index.pdf.

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Interest in recovery of carboxylic acids from their aqueous solutions and production media has been growing with the improvements in the production techniques. Reactive extraction is proposed as a promising method to achieve high distribution coefficients with good selectivity. In the present study, equilibrium and kinetic studies, needed for the design of a recovery unit were carried out. Reactive extraction of pyruvic, acetic and lactic acids from their single and mixed acid solutions were carried out with tertiary amines, Alamine 336 and trioctylamine, dissolved in diluents, 1-octanol and oleyl alcohol. The kinetic parameters such as reaction order and rate constant were calculated by using the aqueous solution of pyruvic acid with 1-octanol solution of trioctylamine. The distribution coefficient of pyruvic acid was obtained as 0.30 and 0.07 with 1-octanol and oleyl alcohol respectively. The trend did not change after the addition of the extractants to the diluents. As expected, the more polar diluent extracted more acid than the less polar one. The extractant was observed to be the limiting reagent of the reversible complexation reaction in the organic phase. It was seen that loading ratio was not affected by the concentration of the extractant in the organic phase but increased with the equilibrium concentration of the acid in the aqueous phase. The results showed that mainly (1-1) acid-amine reaction occurred in the organic phase. Because tertiary amines can react with only undissociated acids, the increase in the initial pH of the aqueous phase caused a decrease in the distribution coefficients of the carboxylic acids studied. The effect of the concentration of the organic phase disappeared when the initial pH of the aqueous phase was 4.0 and a distribution coefficient value of 0.1 was achieved for all concentration levels of organic phase. Similar results were obtained for acetic and lactic acids and this behavior was used to propose a selective recovery of the acids from their mixed acid solutions. The presence of acetic acid prevented the extraction of pyruvic acid. The increase in the concentration of the extractant in the organic phase caused an increase in the distribution coefficient of pyruvic acid. During the extraction process, lactic acid could not be recovered from ternary acid solutions because of its high hydrophilicity. The results of reactive extraction of lactic and pyruvic acids from their binary acid solutions showed that at higher concentration of lactic acid, the distribution of pyruvic acid was negatively affected. On the other hand, the presence of lactic acid at a low concentration level did not affect the distribution of pyruvic acid. It was found that the reaction between pyruvic acid and trioctylamine in 1-octanol was first order with respect to the reactants with a second order rate constant of 0.94 L mol-1 s-1. The enhancement factor of the system was obtained as 25.

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Trownson, Glenn. "The high temperature corrosivity of radiolysed nitric acid solutions." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html.

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Currently in the UK, spent nuclear fuel is reprocessed using the PUREX (Plutonium Uranium Reduction Extraction) process. This process generates large amounts of aqueous nitric acid based waste which is reduced in volume by evaporation before being stored in stainless steel tanks pending eventual disposal to a repository after conversion into a solid wasteform. The corrosivity of nitric acid solutions towards these stainless steel storage tanks is strongly affected by the presence of oxidants that can form in situ if certain dissolved metals such as cerium, chromium, ruthenium and neptunium are present, which is invariably the case in nuclear reprocessing plant liquors. Such liquors are, however, subject to radiolysis leading to the formation of nitrous acid and NOx species in equilibrium with nitric acid and water. The redox chemistry of irradiated reprocessing plant liquors is therefore complex, depending on a large number of factors including acidity, nitrate ion concentration, temperature, pressure, radiation dose rate and the nature/concentration of dissolved species. High acidities, high temperatures and low dose rates favour the oxidation of species such as Ce(III). For example, when Ce(IV) forms, the corrosion rate of stainless steel is strongly increased since the reduction of Ce(IV) forms a kinetically-favoured path way. Furthermore, the presence of nitrous acid (which is radiolytically formed from nitrate/nitric acid) can act to reduce potential corrosion accelerators (e.g. Ce(IV)) to their non-oxidising valency states. These dependencies are only semi-quantitatively understood at present, hampering useful prediction of actual effects when conditions are changed. The research presented within this thesis is divided between two experimental campaigns which are interrelated by their applicability to highly active storage tank conditions; I. An investigation into the conditions which effect the radiolytic production of nitrous acid in nitric acid based solutions was undertaken. This included the quantitative measurement of the steady state concentration of nitrous acid experienced under different conditions. The conditions investigated include temperature, dose rate, gaseous headspace and liquor composition in order to elucidate which factors are of importance in estimating the concentration of nitrous acid which can be expected at the base of a highly active storage tank. The major result of this campaign was that nitrous acid data collected could be used to formulate a g-value of nitrous acid formation (which was found to be 0.71) and this value was used to calculate the nitrous acid production rate expected within a highly active storage tank which is a pre-requisite of underpinning the corrosion chemistry within. II. Investigation into the potential formation of in situ corrosion accelerators in a reprocessing liquor simulant was undertaken. For this, a bespoke experimental rig has been designed, built and operated in order to identify the valency of potential corrosion accelerators at high temperatures while closely representing the conditions expected at the base of a highly active storage tank. This included the simulation of nitric acid radiolysis by means of an appropriate nitrite addition underpinned by the radiolysis studies described above in (I). It was found that none of the conditions investigated were oxidising enough to promote the generation of Ce(IV), which is contrary to the current understanding and should be favourable with regards to the storage tank remnant life expectations. Results reported in this thesis provide insight into the corrosivity of reprocessing liquors under representative storage tank conditions at various temperatures (up to the local liquor saturation temperature) and this knowledge will help improve remnant life predictions of the highly active storage tanks on the Sellafield site.

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Bengraine, Karim. "Ozonation de solutions aqueuses : role de l'eau oxygenee." Paris 7, 1988. http://www.theses.fr/1988PA077176.

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Contribution a la meilleure connaissance des phenomenes impliques dans une filiere de traitement de l'eau, avec un interet plus particulier au role de l'eau oxygenee au cours de l'ozonation de solutions aqueuses. Etude de l'ozonation de molecules organiques (acides salicylique, phtalique et oxalique), des mecanismes mis en jeu et comparaison des produits obtenus par ozonation et par reaction de fenton

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Principe, Frank T. "Separation of iron(III) from zinc sulphate-sulphuric acid solutions using organophosphoric acid extractants." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0016/MQ55025.pdf.

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Österdahl, Kerstin. "Crystallization of iron fluoride trihydrate from mixed acid solutions /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-347.

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Liu, Jingyi. "Acetic acid separation from aqueous solutions using ionic liquids." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.679212.

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A series of hydrophobic ionic liquids (ILs) have been employed to extract acetic acid from aqueous solutions at 101.3 KPa. This study was carried out using tetradecyltrihexylphosphonium cation ([P666, 14]+) combined with two series of anions: benzoate and long-chain carboxylate based anions. For comparison, the extraction of organic solvent MTBE was also investigated. The long-chain carboxylate based ILs showed a larger two phase region and high extraction efficiency. [The performance of a selection of inorganic salts, organic salts, and ILs in the extractive distillation for the (HOAc + H20) system was analyzed by vapour-liquid equilibrium under atmospheric pressure. The results indicate that the inorganic salts showed a salting-out effect of acetic acid while all the organic salts and ILs presented salting-out effect of water. All the ILs investigated showed a notable salting-out effect of wate which implied that an IL might be a promising additive in extractive distillation processes. Supported materials were investigated in extractive distillation for the (HOAc + H20) system. The performance of a selection of organic and ILs functionalized supports was analyzed by vapour-liquid equilibrium at 101.3 kPa. Leaching problem of the imidazolium based IL tethered support, blockage problem of the powder support and the saturation of the support during continuous distillation are still the challenging parts in this work. The UNIFAC method was employed to correlate and predict the LLE and VLE data for IL/salt modified systems. The results illustrated that the UNIF AC model has the ability to correlate and predict both VLE and LLE in mixtures containing ILs or salts with satisfactory accuracy. In addition, the ability of a commercial process simulator (Aspen Plus), to model phase equilibrium for the ternary systems of (HOAc + H20 + IL/salt) was examined. The physico-chemical properties of the investigated ionic liquids were characterized as a function of temperature.

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Forsberg, Kerstin. "Crystallization of metal fluoride hydrates from mixed acid solutions /." Stockholm : Skolan för kemivetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10619.

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Книги з теми "Acid solutions"

Siochi, Emilie J. Stability of poly(amide acid) solutions. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1998.

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G, Schwieger Robert, Elliott Thomas C, and International Conference on Acid Rain (2nd : 1985 : Washington, D.C.), eds. Acid rain: Engineering solutions, regulatory aspects. New York: Hemisphere Pub. Corp., 1985.

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Nejat, Veziroğlu T., ed. Environmental problems and solutions: Greenhouse effect, acid rain, pollution. New York: Hemisphere Pub. Corp., 1990.

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Shepherd, Jeffrey L. Complex oscillations and chaos during anodic dissolution of nickel in sulphuric acid solutions. Sudbury, Ont: Laurentian University, 1999.

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Jacobs, James. Effects of acid and metal solutions on seedling foliage of two western conifers. Ogden, UT (324 25th St., Ogden 84401): U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station, 1994.

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Birchall, K. L. The stress corrosion cracking of a low alloy steel in lithiated boric acid solutions. Manchester: UMIST, 1989.

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Barry, Aaron P. Formation of surface films and periodic current oscillations during anodic dissolution of nickel in sulfuric acid solutions. Sudbury, Ont: Laurentian University, 1999.

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Thorn, Kevin A. Characterization of the International Humic Substances Society standard and reference fulvic and humic acids by solution state carbon-13 (C) and hydrogen-1 (H) nuclear magnetic resonance spectrometry. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.

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Thorn, Kevin A. Characterization of the International Humic Substances Society standard and reference fulvic and humic acids by solution state carbon-13 (p13sC) and hydrogen-1 (p1sH) nuclear magnetic resonance spectrometry. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1991.

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Cook, Michelle Schoffro. The Ultimate pH Solution. New York: HarperCollins, 2007.

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Частини книг з теми "Acid solutions"

Wohlfarth, Ch. "Second virial coefficient of poly(dl-lactic acid-co-glycolic acid." In Polymer Solutions, 951. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_584.

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Wohlfarth, Ch. "Second virial coefficient of poly(3-hydroxybutanoic acid-co-3-hydroxypentanoic acid)." In Polymer Solutions, 902–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_558.

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Apelblat, Alexander. "Properties of Citric Acid and Its Solutions." In Citric Acid, 13–141. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11233-6_2.

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Apelblat, Alexander. "Dissociation Equilibria in Solutions with Citrate Ions." In Citric Acid, 143–212. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11233-6_3.

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Wohlfarth, Ch. "Vapor-liquid equilibrium data of poly(3-hydroxybutanoic acid-co-3-hydroxypentanoic acid) in chlorobenzene." In Polymer Solutions, 1306–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_262.

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Wohlfarth, Ch. "Partial specific volume of poly(acrylic acid)." In Polymer Solutions, 348–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_166.

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Wohlfarth, Ch. "Partial specific volume of poly(methacrylic acid)." In Polymer Solutions, 483. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_261.

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Wohlfarth, Ch. "Second virial coefficient of dextran (acid-hydrolyzed)." In Polymer Solutions, 559. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_330.

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Wohlfarth, Ch. "Second virial coefficient of poly(acrylic acid)." In Polymer Solutions, 584–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_351.

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Wohlfarth, Ch. "Solubility parameter of poly(dl-lactic acid)." In Polymer Solutions, 1606. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_957.

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Тези доповідей конференцій з теми "Acid solutions"

Amro, Mohammed M. "Extended Matrix Acidizing Using Polymer-Acid Solutions." In SPE Technical Symposium of Saudi Arabia Section. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/106360-ms.

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HONG, Y. K., Y. S. HUH, and W. H. HONG. "REMOVAL OF ACETIC ACID FROM AQUEOUS SOLUTIONS CONTAINING SUCCINIC ACID AND ACETIC ACID BY AMINE EXTRACTANTS." In Proceedings of the 4th International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702623_0140.

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Lecolier, Eric, Alain Rivereau, Nathalie Ferrer, Annie Audibert-Hayet, and Xavier Longaygue. "Study of New Solutions for Acid-Resistant Cements." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/116066-ms.

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Reimus, M. A. H., G. L. Silver, L. Pansoy-Hjelvik, and K. B. Ramsey. "Containment of nitric acid solutions of Plutonium-238." In Space technology and applications international forum -1999. AIP, 1999. http://dx.doi.org/10.1063/1.57555.

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Zelinsky, A. G., O. N. Shevtsova, and S. N. Ovchinnikova. "Peculiarities of silver reduction from acid thiourea solutions." In 2008 Third International Forum on Strategic Technologies (IFOST). IEEE, 2008. http://dx.doi.org/10.1109/ifost.2008.4602955.

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Kleschenko, I., M. Rezvanova, and A. Poznyak. "Peculiarity of Aluminium Anodization in Sulphosalicylic Acid Solutions." In 2006 16th International Crimean Microwave and Telecommunication Technology. IEEE, 2006. http://dx.doi.org/10.1109/crmico.2006.256153.

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Nicu, Mihaela I., Laura A. Ionascu, Felicia N. Dragolici, Corneliu N. Turcanu, Gheorghe Gh Rotarescu, and Gheorghe C. Dogaru. "Conditioning of Pretreated LLW Generated by the Decontamination of VVR-S Nuclear Research Reactor Primary Circuit." In ASME 2013 15th International Conference on Environmental Remediation and Radioactive Waste Management. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icem2013-96063.

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Concentration of complexing acids solutions (oxalic acid, tartaric acid and citric acid) used in radioactive decontamination by chemical method affects both the mechanical stability and the chemical stability of cement matrix. The paper presents the works performed related to the chemical pretreatment of these organic acids solutions using as neutralizing agent Ca(OH)2. In this way it was possible to increase the concentration of organic acids solutions used and the soluble complex radionuclides passing in chemical precipitates, these affecting in a smaller manner the mechanical stability of the cement matrix. The chemical pretreatment the effluents improve the precipitation and conditioning performances by cementation. Were prepared compositions with complexing agents and compositions for oxidative degradation tests to simulate the concentrations of secondary radioactive waste obtained from the primary circuit decontamination of the VVR-S research reactor. It has been studied the influence of chemical pretreatment of complexing acids solutions of different concentrations on the setting time. Also it was determined the compressive strength of mortar samples in which were embedded these solutions of chemically pretreated organic acids. The results shown that an optimum cement–solution ratio doesn’t have a significant impact on the setting time or on the mechanical properties.

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Que, Christopher T., Alfonsina Ramundo-Orlando, Kohji Yamamoto, and Masahiko Tani. "Terahertz spectroscopy of ascorbic acid oxidase in aqueous solutions." In 2010 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010). IEEE, 2010. http://dx.doi.org/10.1109/icimw.2010.5612420.

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Tang, Zhengyuan, Sinead Baraton, Tomás Ward, Bryan Hennelly, John P. Lowry, Hugh J. Byrne, and Michelle Doran. "Quantifying the concentration of glucose, urea, and lactic acid in mixture by confocal Raman microscopy." In Biophotonics: Photonic Solutions for Better Health Care, edited by Jürgen Popp, Valery V. Tuchin, and Francesco S. Pavone. SPIE, 2018. http://dx.doi.org/10.1117/12.2307550.

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Miranda, C. R., and J. S. Gold. "Study of Cement Resistance to the Attack of Acid Solutions." In International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1997. http://dx.doi.org/10.2118/37225-ms.

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Звіти організацій з теми "Acid solutions"

Rudisill, T. S. Thermal Stability of Acetohydroxamic Acid/Nitric Acid Solutions. Office of Scientific and Technical Information (OSTI), March 2002. http://dx.doi.org/10.2172/799683.

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KESSINGER, GLENF. Nylon Dissolution in Nitric Acid Solutions. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/833860.

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Pierce, R. A. Dibutyl Phosphoric Acid Solubility in High-Acid, Uranium-Bearing Solutions at SRS. Office of Scientific and Technical Information (OSTI), October 1998. http://dx.doi.org/10.2172/4886.

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Smith, J. R., and W. S. Cavin. Isothermal heat measurements of TBP-nitric acid solutions. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/90218.

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Gray, J. H. Solubility of Boron Compounds in Nitric Acid Solutions. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/4883.

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Pierce, R. GADOLINIUM OXALATE SOLUBILITY MEASUREMENTS IN NITRIC ACID SOLUTIONS. Office of Scientific and Technical Information (OSTI), February 2012. http://dx.doi.org/10.2172/1035778.

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Pierce, R. A. GADOLINIUM OXALATE SOLUBILITY MEASUREMENTS IN NITRIC ACID SOLUTIONS. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1036449.

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Wiersma, B. J. Corrosion Testing of Carbon Steel in Acid Cleaning Solutions. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/805803.

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Crawford, C. L., and R. A. Peterson. Decomposition Studies of Triphenylboron, Diphenylborinic Acid and Phenylboric Acid in Aqueous Alkaline Solutions Containing Copper. Office of Scientific and Technical Information (OSTI), February 1997. http://dx.doi.org/10.2172/626418.

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Smith, J. R. Radiolysis gases from nitric acid solutions containing HSA and HAN. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10106281.

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