Artículos de revistas: "Liquid extraction purification"

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Huseynov, H. D. "IONIC LIQUID EXTRACTION CLEANING OF PETROLEUM FRACTIONS". Chemical Problems 20, n.º 3 (2022): 197–212. http://dx.doi.org/10.32737/2221-8688-2022-3-197-212.

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The extraction purification process is currently being intensively studied and has a great future as an alternative method of purification of petroleum fractions. The point is that the development of technology and rise in the consumption of fuels and oils calls for tightening of requirements to their quality characteristics. At the same time, special attention is paid to the content of aromatic hydrocarbons, sulfur-containing and resinous compounds in their composition. The present review considers the results of studies of extractive purification of various oil fractions using both traditional and "green" solvents - ionic liquids as an extractant providing for the effectiveness of ion-liquid extraction purification. The article also describes studies on combining the process of ion-liquid extraction with an oxidative purification method. The results of studies carried out at the Institute of Petrochemical Processes of the National Academy of Sciences of Azerbaijan on ion-liquid extraction purification of petroleum distillates for various purposes, in particular, transformer oil distillate, catalytic cracking and reforming gasoline, AMG-10 hydraulic fluid, Naftalan oil, diesel fuel, as well as oil distillates fractions with different viscosity values, are shown in the article. Also, the possibility getting petroleum products when used as a selective solvent of ionic liquids (morpholformate, anilinformate, N-methylpyrrolidone acetate, etc.) differing in cationic-anionic combination is substantiated.

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Ibragimova, M. J., S. A. Seidova, S. G. Alieva, H. J. Huseynov, Kh A. Abdullaeva y F. Yu Yusifzade. "IONIC LIQUIDS AS EXTRAGENTS OF COMPOUNDS NEGATIVELY AFFECTING THE ENVIRONMENTAL PROPERTIES OF DIESEL FUEL". Azerbaijan Chemical Journal, n.º 3 (21 de agosto de 2024): 20–28. http://dx.doi.org/10.32737/0005-2531-2024-3-20-28.

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The results of scientific research in the field of liquid-liquid extraction purification of diesel distillates differing in the content of undesirable aromatic and sulfur compounds using various ionic liquids as a selective, environmentally friendly solvent are presented. Different extracting ability of ionic liquids (dipropylammonium, dibutylammonium and N-methylpyrrolidinium acetate, morpholinium formate) in relation to the extracted components of diesel distillate is shown. In particular, a high degree of purification of the hydrotreated diesel fraction was established when using N-methylpyrrolidinium acetate ionic liquid in the extraction process. The influence of the staged process of extraction purifica-tion of mixed diesel distillate based on straight-run diesel fraction (70% vol.) and secondary oil processing products - light gas oil coking and light gas oil catalytic cracking (30% vol.) on the degree of dearomatization and desulfurization of the fuel has been determined. A relatively high yield and degree of purification of diesel fuel were revealed when carrying out the process of extraction purification of the mixed diesel distillate with N-methylpyrrolidinium acetate ionic liquid in three stages. The extraction purification process was studied using IR and UV spectral analysis methods and the possibility of purifying three- and fourcyclic aromatic hydrocarbons from the mixture of straight-run diesel fraction and secondary petroleum products was established when carrying out the extraction process with N-methylpyrrolidinium acetate ionic liquid

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Blaga, Alexandra Cristina, Alexandra Tucaliuc y Lenuta Kloetzer. "Applications of Ionic Liquids in Carboxylic Acids Separation". Membranes 12, n.º 8 (9 de agosto de 2022): 771. http://dx.doi.org/10.3390/membranes12080771.

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Ionic liquids (ILs) are considered a green viable organic solvent substitute for use in the extraction and purification of biosynthetic products (derived from biomass—solid/liquid extraction, or obtained through fermentation—liquid/liquid extraction). In this review, we analyzed the ionic liquids (greener alternative for volatile organic media in chemical separation processes) as solvents for extraction (physical and reactive) and pertraction (extraction and transport through liquid membranes) in the downstream part of organic acids production, focusing on current advances and future trends of ILs in the fields of promoting environmentally friendly products separation.

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Evstaf’ev, Sergei N. y Cuong Q. Hoang. "PURIFICATION OF 1-BUTYL-3-METHYLIMIDAZOLIUM CHLORIDE AFTER DISSOLUTION OF WHEAT STRAW". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, n.º 3 (27 de febrero de 2018): 83. http://dx.doi.org/10.6060/tcct.20186103.5615.

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The existing technologies for the extraction of polysaccharides and lignin from lignocellulosic materials from an ecological and economic point of view are imperfect. The solution of this actual problem at present day is possible by heat treatment of lignocellulosic materials at the atmospheric pressure and relatively low temperature in the environment of ionic liquids. The use of ionic liquids for the fractionation of lignocellulosic raw materials isn't found industrial application because of their relatively high cost and sensitivity to contamination, despite the unique set of physico-chemical properties for dissolving cellulose. The solution of the problem is possible by reusing ionic liquid in the technological process without losing their effectiveness, which requires purification from impurities. The purpose of thе work was the comparative research of the efficiency of purification of 1-butyl-3-methylimidazolium chloride by adsorption on activated carbon, liquid extraction by organic solvents (benzene, dioxane, tetrahydrofuran) and supercritical CO2 extraction. It has been established that the methods of liquid extraction, supercritical CO2 extraction and adsorption on activated carbon can be used to purify 1-butyl-3-methylimidazolium chloride from extractives of wheat straw. For the purpose of comparison of efficiency of purification with above-mentioned methods the GC-MS, IR- and 1H NMR spectroscopy were used. It was revealed that extraction of impurities by organic solvents, such as benzene, dioxane and tetrahydrofuran, allows to reduce significantly their content in ionic liquid while supercritical CO2-extraction and adsorption on activated carbon almost completely remove impurities. Considering the substantial losses of the ionic liquid when using adsorption to purify 1-butyl-3-methylimidazolium chloride from the extractives of wheat straw, a supercritical CO2 extraction method can be recommended for use.Forcitation:Evstaf’ev S.N., Hoang C.Q. Purification of 1-butyl-3-methylimidazolium chloride after dissolution of wheat straw. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 83-87

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Chaturvedi, Tanmay, Laura Sini Sofia Hulkko, Malthe Fredsgaard y Mette Hedegaard Thomsen. "Extraction, Isolation, and Purification of Value-Added Chemicals from Lignocellulosic Biomass". Processes 10, n.º 9 (2 de septiembre de 2022): 1752. http://dx.doi.org/10.3390/pr10091752.

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This review covers the operating conditions for extracting top value-added chemicals, such as levulinic acid, lactic acid, succinic acid, vanillic acid, 3-hydroxypropionic acid, xylitol, 2,5-furandicarboxylic acid, 5-hydroxymethyl furfural, chitosan, 2,3-butanediol, and xylo-oligosaccharides, from common lignocellulosic biomass. Operating principles of novel extraction methods, beyond pretreatments, such as Soxhlet extraction, ultrasound-assisted extraction, and enzymatic extraction, are also presented and reviewed. Post extraction, high-value biochemicals need to be isolated, which is achieved through a combination of one or more isolation and purification steps. The operating principles, as well as a review of isolation methods, such as membrane filtration and liquid–liquid extraction and purification using preparative chromatography, are also discussed.

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Seidova, Sabina A. "EXTRACTION METHODS OF CLEANING OF MOTOR FUEL". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, n.º 10 (29 de octubre de 2019): 30–39. http://dx.doi.org/10.6060/ivkkt.20196210.5941.

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In paper the results of the carried out analysis of literary data on preparation of motor fuels of high quality by extraction method of purification of the corresponding oil distillates with use of compounds of various class as a selective solvent have been presented. In particular, the results of comparative analysis of existing methods of the extraction purification of distillates of motor fuels from unnecessary components – aromatic hydrocarbons, sulphur-containing compounds and resinous substances with use of organic solvents and ion-liquid compositions as a selective solvent have been presented. The advantage of the extraction method of purification of motor fuels determined by possibility of the process at low temperature and pressure, by absence of necessity of application of the expensive catalysts, by possibility of regeneration and reuse of solvent, etc. in comparison with widely used hydrogenation method has been shown. The lacks of the organic solvents used as an extractant have been also listed and due to the ecological problems the use of non-volatile, thermally stable ion-liquid compositions as a selective solvent in the processes of purification of the distillates, intended for preparation a high quality target products, such as diesel fuel, gasoline, base oils for various purposes has been substantiated. In paper the results of systematic investigations carried out at the Institute of Petrochemical Processes of Azerbaijan National Academy of Sciences with the participation of the authors themselves, concerning the selective purification of the oil fractions of various composition and viscosity with use of ionic liquids synthesized on the basis of formic and acetic acids composition have been also presented. By carried out analysis it has been shown the perspectivity of application of the ion-liquid compositions as an extractant in the processes of the selective purification of the oil distillates.

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Niu, Rui Xia, Bo Lin Li y Biao Long. "Purification and Fractionation of Natural Petroleum Sulfonates by Liquid-Liquid & Soxhlet Extraction". Advanced Materials Research 455-456 (enero de 2012): 496–502. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.496.

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Natural petroleum sulfonates (PS) was separated, purified and divided into several fractions by a new method liquid-liquid & soxhlet extraction. The effects of heating time, volume ratio of extractants (isopropanol aqueous solution-50/50 (by volume) : n-pentane), gradient solvent types, extracting time & times on the separation efficiency are discussed, respectively. And the extracted mineral oil was anlalyzed by IR spectra, the average equivalent weight of each extracted PS fraction was measured by ESI-MS. The experimental results show that the volatiles in natural plant-manufactured PS can evaporate thoroughly in 3.5h at 130°C, and when the volume ratio of stated extractants is 3:1, after several times extraction & anti-extraction, the extracted mineral oil is PS-free, and the purified PS is successfully separated from inorganic salt, meanwhile the purified PS was divided into four fractions, whose average equivalent weight are (toluene extract) 595.03, (dichloromethane extract) 486.00, (isopropanol extract) 474.85 and (alcohol extract) 384.5g/mol, respectively. The proposed method is superior to the traditional liquid-liquid extraction for simplified steps and bifunction with PS purifying & fraction dividing, can separate efficiently industrial PS and other similar mixtures.

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Curran, Dennis P, Reena Bajpai y Elizabeth Sanger. "Purification of Fluorous Mitsunobu Reactions by Liquid-Liquid Extraction". Advanced Synthesis & Catalysis 348, n.º 12-13 (agosto de 2006): 1621–24. http://dx.doi.org/10.1002/adsc.200606187.

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Bendada, A., A. H. Meniai y L. M. Bencheikh. "Modeling of Phosphoric Acid Purification by Liquid-Liquid Extraction". Chemical Engineering & Technology 24, n.º 12 (diciembre de 2001): 1273–80. http://dx.doi.org/10.1002/1521-4125(200112)24:12<1273::aid-ceat1273>3.0.co;2-j.

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10

Mansel, Alexander y Karsten Franke. "Production of no-carrier-added 89Zr at an 18 MeV cyclotron, its purification and use in investigations in solvent extraction". Journal of Radioanalytical and Nuclear Chemistry 328, n.º 1 (11 de marzo de 2021): 419–23. http://dx.doi.org/10.1007/s10967-021-07634-x.

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AbstractThe chemical separation of zirconium from lanthanides by liquid–liquid extraction is challenging but critical for medical and technological applications. Using the example of 89Zr, we optimize the liquid–liquid-extraction process by means of the radiotracer technique. We produced 89Zr by proton irradiation of a metallic yttrium target at a cyclotron. The purification of the radionuclide was performed by a UTEVA resin. 89Zr was separated in no-carrier-added form in a sulfuric acid solution. 89Zr was successfully used in solvent extraction tests with calixarenes for the separation of zirconium from lanthanides. This reaction is suitable for the efficient extraction and purification of lanthanides.

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11

Lestari, Gabriella, Alinaghi Salari, Milad Abolhasani y Eugenia Kumacheva. "A microfluidic study of liquid–liquid extraction mediated by carbon dioxide". Lab on a Chip 16, n.º 14 (2016): 2710–18. http://dx.doi.org/10.1039/c6lc00597g.

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Liquid–liquid extraction is an important separation and purification method; however, it faces a challenge in reducing the energy consumption and the environmental impact of solvent (extractant) recovery. An oscillatory microfluidic platform is proposed to study reactive liquid–liquid extraction involving switchable solvents and carbon dioxide gas.

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12

Koźlecki, Tomasz, Wojciech Sawiński, Adam Sokołowski, Wojciech Ludwig y Izabela Polowczyk. "Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6]". Polish Journal of Chemical Technology 10, n.º 1 (1 de enero de 2008): 79–83. http://dx.doi.org/10.2478/v10026-008-0018-2.

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Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6] Extraction of several chloro compounds from water has been examined. As the extracting liquid the 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6], which is common hydrophobic ionic liquid, was used. Additionally, extraction of selected chlorinated compounds from tert-butylmethylether (MTBE) was investigated. The obtained results show the usefulness of [BMIM][PF6] to remove the organic impurities from water, particularly at the concentration range inappropriate for biological purification plants.

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Molero, C., A. de Lucas y J. F. Rodríguez. "Purification by Liquid Extraction of Recovered Polyols". Solvent Extraction and Ion Exchange 24, n.º 5 (octubre de 2006): 719–30. http://dx.doi.org/10.1080/07366290600762587.

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Béri, János, Sára Nagy, Ádám Kolay Kovács, Erika Vági y Edit Székely. "Pressurized Liquid Extraction of Hemp Residue and Purification of the Extract with Liquid-Liquid Extraction". Periodica Polytechnica Chemical Engineering 66, n.º 1 (26 de noviembre de 2021): 82–90. http://dx.doi.org/10.3311/ppch.18456.

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The first semi-continuous Pressurized Liquid Extraction (PLE) of hemp threshing residue with ethanol was carried out according to a 32 full factorial experimental design with pressure and temperature as independent variables at 8-10-12 MPa and 323-333-343 K, respectively. The total- and cannabidiol (CBD) yield curves were fitted to the modified two-parameter Brunner equation. Best results, concerning CBD, can be achieved at 12 MPa and 343 K. Solvent mass-consumption and operation time were considerably decreased compared to a previous supercritical fluid extraction study on the same material. Furthermore, the concentration profiles were evaluated to study the mass transfer. The winterized dry extracts were further studied in a methanol-hexane-water ternary system concerning CBD distribution ratio, showing high methanol dependency.

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Yan, Xu, Maria Aparecida Souza, Marcela Z. R. Pontes, Michele Vitolo y Adalberto Pessoa Júnior. "Liquid-liquid extraction of enzymes by affinity aqueous two-phase systems". Brazilian Archives of Biology and Technology 46, n.º 4 (diciembre de 2003): 741–50. http://dx.doi.org/10.1590/s1516-89132003000400030.

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From analytical to commercial scale, aqueous two-phase systems have their application in the purification, characterization and study of biomaterials. In order to improve the selectivity of the systems, the biospecific affinity ligands were introduced. In the affinity partitioning aqueous two-phase system, have many enzymes been purified. This review discusses the partitioning of some enzymes in the affinity aqueous two-phase systems in regard to the different ligands, including reactive dyes, metal ions and other ligands. Some integration of aqueous two-phase system with other techniques for more effective purification of enzymes are also presented.

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Sankaran, Revathy, Jenn Hau Bong, Yin Hui Chow, Fadzlie Wong Faizal Wong, Tau Chuan Ling y Pau Loke Show. "Reverse Micellar System in Protein Recovery - A Review of the Latest Developments". Current Protein & Peptide Science 20, n.º 10 (20 de septiembre de 2019): 1012–26. http://dx.doi.org/10.2174/1389203720666190628142203.

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Reversed micellar system (RMS) is an innovative technique used for the isolation, extraction and purification of proteins and enzymes. Studies have demonstrated that RMS is an efficient purification technology for extracting proteins and enzymes from natural plant materials or fermentation broth. Lately, reverse micelles have wider biological applications and the ease of scaling up and the possibility for the continuous process have made RMS a vital purification technique in various fields. In this study, an extensive review of RMS with the current application in biotechnology is examined. This review provides insights into the fundamental principles, key variables and parameters of RMS. In addition, a comparative study of RMS with other liquid-liquid extraction techniques is also included. The present review aims to provide a general overview of RMS by summarising the research works, since the introduction of the technology to current development.

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Cuong, Dang Xuan. "Antioxidant chlorophyll purification from maize leaves by liquid-to-liquid extraction method". Journal of Drug Delivery and Therapeutics 10, n.º 3 (15 de mayo de 2020): 152–58. http://dx.doi.org/10.22270/jddt.v10i3.4104.

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Chlorophyll is the blood of plant possesses a medical-value for treating support of disease in human, and the paper focused on the purification of antioxidant chlorophyll extracting from maize leaves in Vietnam. Chlorophyll was extracted with 96% ethanol and segmented by different solvents, for example, n-hexane, 96% ethanol, and ethyl acetate, respectively. Ethanol fraction was running via the chromatography column of silica gel for collecting antioxidant purified chlorophyll. All fractions were analysed chlorophyll content, antioxidant activities (total antioxidant activity, reducing power activity, and DPPH free radical scavenging activity) and run the thin layer chromatography for determining the chlorophyll purification degree and the Rf. The results showed that the purification of antioxidant chlorophyll from maize leaves was by using the liquid-liquid segment and the column run, for example, in turn, ethanol, n-hexane, ethanol, and the silica gel chromatography. The highest value of chlorophyll content, total antioxidant activity, reducing power activity, and DPPH free radical scavenging activity was 0.563±0.003 µg chl equivalent/ml, 1.392±0.018 mg ascorbic acid equivalent/ml, 3.396±0,024 mg FeSO4/ml, and 76.34±0.81 (%), respectively, as the n-hexane/ethanol ratio of 1/1 (v/v). After the chromatography run, chlorophyll content, total antioxidant activity, reducing power activity, and DPPH free radical scavenging activity corresponded to 0.217±0.002 µg chl equivalent/ml, 0.628±0.013 mg ascorbic acid equivalent/ml, 1.928±0.019 mg FeSO4/ml, and 77.19±0.58 (%), respectively. Keywords: antioxidant, chlorophyll, maize, purification, liquid-to-liquid

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Li, Xing Yuan, Bing Xie, Wen Lan Guo, Run Zi Guo y Xiao Hong Kou. "Extraction and Purification of Asparagus Oligosaccharides". Advanced Materials Research 550-553 (julio de 2012): 1886–92. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.1886.

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The hot water method conditions of extracting oligosaccharides from asparagus are: extraction temperature: 80°C, extraction time: 90min, solid-liquid ratio: 1:20, ethanol final concentration: 80%, ethanol precipitation time: 8h and extraction times: 2. Different auxiliary treatments were tested to enhance the extraction ratio and it was improved from 3.842% to 9.638% after microwave freeze-thawing. Comparing of oligosaccharides contents between purple asparagus and green asparagus in different parts, the results showed that the oligosaccharides content in purple asparagus is about 3.5 times as that in green asparagus, and the oligosaccharides content of peel is higher than that of pulp in both asparagus. Different purification tests showed that combined action of papain and Sevag obtained a better effect.

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Guo, Jie Zhi, Hao Guo Tang, Hong Juan Yao y Yan Mei Zhang. "Research on the Extraction and Purification of Dihydromyricetin from Ampelopsis grossedentata". Advanced Materials Research 1033-1034 (octubre de 2014): 738–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.738.

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Extracting dihydromyricetin from Ampelopsis grossedentata by water extraction method. The orthogonal test and single factor experiment were used to optimize the best extraction condition. The ratio of liquid and material is 20:1, extraction time is 90min, extraction temperature is 90°C,holding time is 1d. The results of comparison between two purification methods show: Purify with acetone and recrystallization with water is better. The purity of dihydromyricetin is high to 98%, recovery rate was 59.2%.

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Amelio, A., L. Loise, R. Azhandeh, S. Darvishmanesh, V. Calabró, J. Degrève, P. Luis y B. Van der Bruggen. "Purification of biodiesel using a membrane contactor: Liquid–liquid extraction". Fuel Processing Technology 142 (febrero de 2016): 352–60. http://dx.doi.org/10.1016/j.fuproc.2015.10.037.

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Schoemig, Veronika, Eda Isik, Lea Martin y Sonja Berensmeier. "Solid liquid liquid extraction of porcine gastric mucins from homogenized animal material". RSC Advances 7, n.º 63 (2017): 39708–17. http://dx.doi.org/10.1039/c7ra06594a.

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Xu, Sijie, Junxia Wang, Dengxian Deng, Yueying Sun, Xuedong Wang y Zhanen Zhang. "A pretreatment method combined matrix solid-phase dispersion with dispersive liquid–liquid micro-extraction for polybrominated diphenyl ethers in vegetables through quantitation of gas chromatography-tandem mass spectrometry (GC-MS)". RSC Advances 13, n.º 23 (2023): 15772–82. http://dx.doi.org/10.1039/d3ra00320e.

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Herein, a novel pretreatment method for extraction of polybrominated diphenyl ethers (PBDEs) using matrix solid phase dispersion (MSPD) and depth purification using dispersive liquid–liquid micro-extraction (DLLME) from vegetables was designed.

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Ren, Guangwei, Xingwen Gong, Bilei Wang, Yingyi Chen y Jianying Huang. "Affinity ionic liquids for the rapid liquid–liquid extraction purification of hexahistidine tagged proteins". Separation and Purification Technology 146 (mayo de 2015): 114–20. http://dx.doi.org/10.1016/j.seppur.2015.03.025.

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Suwal, Shyam y Alice Marciniak. "Technologies for the Extraction, Separation and Purification of polyphenols – A Review". Nepal Journal of Biotechnology 6, n.º 1 (15 de enero de 2019): 74–91. http://dx.doi.org/10.3126/njb.v6i1.22341.

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Polyphenols are high molecular weight, organic molecules mainly found in plant kingdom. They are mostly known for their positive impact on health, specifically for their antioxidant activity. Indeed, they are widely studied for the prevention of multiple diseases such as cancer, inflammatory, cardiovascular and neurodegenerative diseases. Nevertheless, extractions of these growing interest molecules remain challenging using conventional methods such as solvent extraction. That is why recent researches have focused on improving the extraction of polyphenol by using different technologies such as ultrasound, microwave, pressurized liquid, pulsed electric field, supercritical fluid and high hydrostatic pressure. In the current context, the assisted-extraction should demonstrate their potential to improve the extraction efficiency while being cost-effective and with a low environmental impact. To this end, technologies ought to, for instance, increase the solubility of polyphenol and the permeability of the cell wall. Consequently, this review is focused on the use and potential of these technologies to improve polyphenol extractions from plants as well as their purification using various methods. It discusses of the advantages and disadvantages with some examples of all these technologies assisted-extraction in comparison with conventional extraction method as well as purification technology.

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Niftullayeva, Sayad, Yegana Mamedova y Ibrahim Mamedov. "Deep Eutectic Solvents for Liquid-Liquid Extraction-Denitrification". Energy Environment and Storage 3, n.º 2 (30 de mayo de 2023): 66–69. http://dx.doi.org/10.52924/sgaw3909.

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In this study, a new type of deep eutectic solvent was prepared and tested for the selective extraction of nitrogen compounds from model fuels. DES2 was made of triethylammonium acetate [TEA]+[AcO]- and glycerol in a volume ratio of 1:6. The extraction capacity of DES2 was evaluated and compared to DES1a, and DES1b. The denitrification process was carried out at room temperature. The volume ratio of DESs to model fuels were taken 1:1. Obtained results showed, that DES2 was highly selective for all nitrogen compounds (pyridine, quinoline, indole, and pyridine/quinoline mixture) in a one-step liquid-liquid extraction (LLE). The purification rate of the pyridine, indole and pyridine/quinoline mixture was 100, 98 and 88% in one hour. Quinoline showed high-extraction efficiency (92%) in three hours of mixing time. All experiments were evaluated by NMR spectra.

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Imbrogno, Joseph, Luke Rogers, Dale A. Thomas y Klavs F. Jensen. "Continuous purification of active pharmaceutical ingredients utilizing polymer membrane surface wettability". Chemical Communications 54, n.º 1 (2018): 70–73. http://dx.doi.org/10.1039/c7cc08218e.

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Mejía-Manzano, Luis Alberto, Bertha A. Barba-Dávila, Janet A. Gutierrez-Uribe, Edgardo J. Escalante-Vázquez y Sergio O. Serna-Saldívar. "Extraction and Isolation of Antineoplastic Pristimerin from Mortonia greggii (Celastraceae)". Natural Product Communications 10, n.º 11 (noviembre de 2015): 1934578X1501001. http://dx.doi.org/10.1177/1934578x1501001130.

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The aim of this research was to identify, extract and isolate pristimerin in leaves, stems and roots of the Mexican plant Mortonia greggii ( Celastraceae). The principal objective was to determine the best laboratory experimental conditions for the extraction and isolation of this powerful natural anticancer agent from the root tissue. Six experimental factors in solid-liquid pristimerin extraction were analyzed: solvent systems, number of extractions, ratio of plant weight (g)/solvent volume (mL) used, time of extraction, temperature and agitation. A mathematical model was generated for pristimerin purity and yield. Ethanol, first extraction, 0.5 ratio of plant weight/solvent volume (g/mL), 0.5 h, 200 rpm and 49.7°C were optimal conditions for the extraction of this phytochemical. The degree of purification of pristimerin root extract was studied by size-exclusion chromatography (SEC) using Sephadex LH-20 reaching fractions with purification indexes (PI) greater than 2 and recoveries of 28.3%. When fractions with purification indices higher than 1 and less than 2 were accumulated, the recovery of pristimerin increased by about 73.6%. By combining the optimum extracts and SEC purification protocols, an enriched fraction containing 245.6 mg pristimerin was obtained from 100 g of root bark, representing about 14.4%, w/w, pristimerin from the total solids presented in the fraction.

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Bostyn, S., J. Gaucher, G. Christophe, R. Soukehal y C. Porte. "An Automated Liquid-Liquid Extraction System Supervised by an Industrial Programmable Logic Controller". JALA: Journal of the Association for Laboratory Automation 6, n.º 1 (febrero de 2001): 53–57. http://dx.doi.org/10.1016/s1535-5535-04-00115-7.

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In the case of development of new products in organic synthesis, the final step of the process must offer the best purity. In this way, the final step is a unit operation of isolation like distillation, crystallisation or liquid-liquid extraction. Therefore, it is necessary to integrate a module of purification on an automated platform for achieving the whole process. In our case, an automated platform was based on Zymark architecture allowing us to automate sample preparation and the reaction steps. For the purification module, we opted to develop our own home module: a liquid-liquid extraction module. This unit operation permits us to separate the final product in the case of peptide synthesis in liquid phase, but equally, in the case of isolation of vegetable molecules. The module capacities had to permit the multistage extraction and the determination of the binodal curve for optimising the process, and to possess in our own system for liberating the Zymark robot for other tasks. The operator interface is developed by using a SCADA (supervisory control).

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Li, Ying, Xiaoli Li, Xueyan Wang, Jiaojiao Xue, Rui Zhang, Yi Ding, Xiuling Chu y Jianqing Su. "Study on Extraction and Purification of Acanthopanax senticosus Polyphenols by an Ionic Liquid-Assisted Aqueous Two-Phase System". Molecules 28, n.º 17 (31 de agosto de 2023): 6383. http://dx.doi.org/10.3390/molecules28176383.

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This study aimed to extract and purify polyphenols from Acanthopanax senticosus. A new green method was developed, in which ionic liquids (ILs) were used as aqueous two-phase (ATP) adjuvants to extract the polyphenols from A. senticosus. An ionic liquid-assisted aqueous two-phase system (IL-ATPS) was established. The purification of the polyphenols from the extraction fluid by AB-8 macroporous resin was conducted, and the kinetic mechanisms were studied. The reuse of ionic liquids was executed. The results showed that an [OMIM]Br-assisted ethanol/NaH2PO4 system (IL-ATPS) was the best extraction solvent. In this study, the following optimal extraction conditions were determined: 32 wt.% ethanol, 25 wt.% NaH2PO4, 9 wt.% additional ionic liquid, a solid–liquid ratio of 1:40 g/mL, an extraction temperature of 50 °C, a pH of 4.0, an extraction time of 50 min, and an extraction rate of the polyphenols at 15.90 mg/g. The optimum adsorption parameters of the macroporous resin AB-8 were as follows: a flow rate of 3.5 BV·h−1, a sample volume of 40 mL, an elution flow rate of 3.5 BV·h−1, an eluent volume of 80 mL, and an eluant that was constituted by an 85% volume fraction of ethanol. The decolorization effect of 4% activated carbon was better than the other amounts; in addition, a decolorization rate of 76.81% and an ionic liquid recovery rate of 81.12% were found to be the most optimal. Compared with the traditional extraction methods, IL-ATPS has the advantages of requiring simple operation, saving time, and high efficiency. In addition, it can be used for the extraction of the polyphenolic compounds.

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Peng, Zuren, Wanying Wang, Xianjun Long, Ping Qiu, Qiaoqiao Liu, Yuanxiang Yang, Xuechun Yang, Meili Wang, Songmao Yin y Xingchu Gong. "Sinomenine Purification by Continuous Liquid-Liquid Extraction Process with Centrifugal Extractors". Advances in Chemical Engineering and Science 10, n.º 03 (2020): 171–80. http://dx.doi.org/10.4236/aces.2020.103012.

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31

Mun, Low Wai, I. S. M. Rafiqul, A. M. M. Sakinah y A. W. Zularisam. "Purification of bioxylitol by liquid–liquid extraction from enzymatic reaction mixture". Separation Science and Technology 51, n.º 14 (22 de agosto de 2016): 2369–77. http://dx.doi.org/10.1080/01496395.2016.1203335.

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Schmidt, Axel, Fabian Mestmäcker, Lisa Brückner, Tobias Elwert y Jochen Strube. "Liquid-Liquid Extraction and Chromatography Process Routes for the Purification of Lithium". Materials Science Forum 959 (junio de 2019): 79–99. http://dx.doi.org/10.4028/www.scientific.net/msf.959.79.

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Since several years, the lithium market is characterized by high growth rates especially due to the increasing demand for lithium-ion batteries. Therefore, the primary production is currently expanded and there is a growing interest in recycling. However, because of the chemical properties of lithium, many production processes lack efficient processes for the separation, concentration and purification of lithium. This article reviews the current use of liquid-liquid extraction (LLE) and chromatography in lithium production as well as research. Currently, the industrial application of LLE and chromatography in lithium purification is limited to the extraction of impurities and co-products. Extraction of lithium is only used as concentration step in few processes before lithium precipitation. In research and development, a wide variety of extractants and resins is investigated. In LLE, chelating extractants like crown ethers and calixarene and synergistic systems show the greatest potential. In the chromatographic separation the main focus of research lies upon cation exchange media, especially media with sulfonated ligands. However, most research is still in early development. Therefore, extensive research is needed to enable the industrial use of optimized LLE and chromatography processes in lithium production. Content TOC \o "1-3" \h \z \u HYPERLINK \l "_Toc515547308" Abstract PAGEREF _Toc515547308 \h 2 HYPERLINK \l "_Toc515547309" Content PAGEREF _Toc515547309 \h 3

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Freitas, Lucas Victor Pereira de, Lorena Maria Guimarães Alves, Lázaro Chaves Sicupira, Gevany Paulino de Pinho y Flaviano Oliveira Silvério. "Determination of DDT in honey samples by liquid–liquid extraction with low-temperature purification (LLE-LTP) combined to HPLC-DAD". Analytical Methods 13, n.º 16 (2021): 1955–64. http://dx.doi.org/10.1039/d1ay00264c.

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Zhao, Chan, Jian Xu, Yao Liu, Peng Xu, Jin Yi, Lin Feng, Yanyan Miao y Yongping Zhang. "Extraction and Purification of Flavonoids and Antiviral and Antioxidant Activities of Polygonum perfoliatum L." Molecules 30, n.º 1 (25 de diciembre de 2024): 29. https://doi.org/10.3390/molecules30010029.

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The aim of the present study was to optimize the process parameters for the extraction and purification of total flavonoids from Polygonum perfoliatum L., in addition to analyzing their chemical composition and evaluating their activity against varicella-zoster virus (VZV) and antioxidant activity. The optimum extraction process was determined using one-way and response surface methods with the following conditions: ethanol concentration of 82.00%, temperature of 90.29 °C, solid-to-liquid ratio of 1:32.78 g/mL, extraction time of 1.5 h, and two extractions with a yield of 14.98 ± 0.11 mg/g. Purification was then carried out using D101 macroporous resin to obtain a flavonoid purity of 43.00 ± 2.55%, which was 3.38 times higher than that of the crude extract (12.74 ± 1.04%). Further purification was carried out using a 1:9 hybrid column of macroporous resin and polyamide, and the purity of flavonoids was enhanced to 59.02 ± 2.23%, which is 1.37 times higher than that of the macroporous resin purifier (43.00 ± 2.55%) and 4.63 times higher than that of the crude extract (12.74 ± 1.04%). Seventy-nine flavonoids were identified using ultra-performance liquid chromatography-tandem high-resolution mass spectrometry (UPLC-HRMS). In addition, the purified flavonoids showed good anti-VZV and antioxidant activities. Therefore, this study can provide technical support and theoretical basis for the further development and utilization of Polygonum perfoliatum L. resources.

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Zhu, Lifang, Shanshan Wang, Faling Wan, Yihong Zhou, Zongde Wang, Guorong Fan, Peng Wang et al. "Quantitative Analysis of Camellia oleifera Seed Saponins and Aqueous Two-Phase Extraction and Separation". Molecules 28, n.º 5 (24 de febrero de 2023): 2132. http://dx.doi.org/10.3390/molecules28052132.

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At present, the technology used for the extraction and purification of Camellia oleifera saponins generally has the problems of high cost and low purity, and the quantitative detection of Camellia oleifera saponins also has the problems of low sensitivity and easy interference from impurities. To solve these problems, this paper aimed to use liquid chromatography for the quantitative detection of Camellia oleifera saponins, and to adjust and optimize the related conditions. In our study, the average recovery of Camellia oleifera saponins obtained was 100.42%. The RSD of precision test was 0.41%. The RSD of the repeatability test was 0.22%. The detection limit of the liquid chromatography was 0.06 mg/L, and the quantification limit was 0.2 mg/L. In order to improve the yield and purity, the Camellia oleifera saponins were extracted from Camellia oleifera Abel. seed meal by methanol extraction. Then, the extracted Camellia oleifera saponins were extracted with an ammonium sulfate/propanol aqueous two-phase system. We optimized the purification process of formaldehyde extraction and aqueous two-phase extraction. Under the optimal purification process, the purity of Camellia oleifera saponins extracted by methanol was 36.15%, and the yield was 25.24%. The purity of Camellia oleifera saponins obtained by aqueous two-phase extraction was 83.72%. Thus, this study can provide a reference standard for rapid and efficient detection and analysis of Camellia oleifera saponins for industrial extraction and purification.

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Zayats, M. F. y S. M. Leschev. "Determination of the bifenazate insecticide in apples and cucumbers by high performance liquid chromatography". Proceedings of the National Academy of Sciences of Belarus, Chemical Series 55, n.º 4 (6 de diciembre de 2019): 422–28. http://dx.doi.org/10.29235/1561-8331-2019-55-4-422-428.

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Based on the distribution constants of biphenazate, obtained experimentally and also calculated from literature data on the solubility of biphenazate in water and organic solvents, as well as experimental data on the extraction of biphenazate from plant matrices by various extractants, we selected the optimal conditions for extracting biphenazate from apples and cucumbers. The conditions for the purification of the extracts were also selected. Acetonitrile in the presence of ammonium sulfate and hexane was used for extraction of the pesticide. Purification of extracts of plant materials was carried out by partitioning between hexane and water-acetonitrile mixture. The samples obtained after this treatment were pure enough to determine the residual amounts of biphenazate in them at the maximum residue level determined in Belarus and the countries of the European Union, or lower using widespread liquid chromatography with diode-array (ultraviolet) detection.

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Wu, Yu Qiong y Wei Dong Man. "Study on Ultrasonic Assisted - Precipitation Method Combined Purification of Tea Saponin". Advanced Materials Research 634-638 (enero de 2013): 1552–56. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1552.

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Commercial crude tea saponin as raw material, ultrasonic assisted extraction technology of tea saponin was investigated. Five influence factors of ethanol concentration, extraction temperature, extraction time, solid-liquid ratio, ultrasonic power on the extraction of tea saponin were studied in detail. Orthogonal experiment through the single factor experiment design, the experimental results show that the optimum operating conditions for the ethanol concentration of 80%, solid-liquid ratio 1: 40, extraction temperature 40°C, ultrasonic power of 300W, ultrasonic extraction time 45 minutes. Under the optimum conditions obtained tea saponin extract with ethanol- acetone precipitation method is further purified, tea saponin content increased from 52.1% to 93.6%. The result indicated that the purity of the tea saponin could be effectively improved through the ultrasonic assisted- precipitation combined method.

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Eiamart, Wanna, Supeecha Wittayalertpanya, Sarin Tadtong y Weerasak Samee. "Efficient Simultaneous Isolation of Pinostrobin and Panduratin A from Boesenbergia rotunda Using Centrifugal Partition Chromatography". Molecules 29, n.º 21 (2 de noviembre de 2024): 5186. http://dx.doi.org/10.3390/molecules29215186.

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The bioactive flavonoids pinostrobin (PN) and panduratin A (PA) from Boesenbergia rotunda are essential for research and therapeutic applications. This study introduces an innovative method utilizing ultrasound-assisted extraction with n-hexane pre-treatment, followed by one-step centrifugal partition chromatography (CPC) purification. Extraction efficiency was evaluated using ultra high-performance liquid chromatography (UHPLC), and the isolated compounds were characterized through 1H-NMR and liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS), adhering to AOAC validation guidelines. Optimal extraction conditions comprised a particle size of 125 μm, a solid-to-liquid ratio of 1:30 g/mL, and a 10 min extraction time, yielding a crude extract of 6.96 ± 0.07%. Using an n-hexane/MeOH/water (5/3.4/1.6, v/v) solvent system in ascending mode, PN (2.16 mg, 98.78% purity) and PA (0.4 mg, 99.69% purity) were isolated from 67 mg of crude extract within 30 min. This streamlined approach enhances purification efficiency, allowing for faster extraction and higher purity, making it a suitable method for commercial applications.

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Bekavac, Nikša, Maja Benković, Tamara Jurina, Davor Valinger, Jasenka Gajdoš Kljusurić, Ana Jurinjak Tušek y Anita Šalić. "Advancements in Aqueous Two-Phase Systems for Enzyme Extraction, Purification, and Biotransformation". Molecules 29, n.º 16 (9 de agosto de 2024): 3776. http://dx.doi.org/10.3390/molecules29163776.

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In recent years, the increasing need for energy conservation and environmental protection has driven industries to explore more efficient and sustainable processes. Liquid–liquid extraction (LLE) is a common method used in various sectors for separating components of liquid mixtures. However, the traditional use of toxic solvents poses significant health and environmental risks, prompting the shift toward green solvents. This review deals with the principles, applications, and advantages of aqueous two-phase systems (ATPS) as an alternative to conventional LLE. ATPS, which typically utilize water and nontoxic components, offer significant benefits such as high purity and single-step biomolecule extraction. This paper explores the thermodynamic principles of ATPS, factors influencing enzyme partitioning, and recent advancements in the field. Specific emphasis is placed on the use of ATPS for enzyme extraction, showcasing its potential in improving yields and purity while minimizing environmental impact. The review also highlights the role of ionic liquids and deep eutectic solvents in enhancing the efficiency of ATPS, making them viable for industrial applications. The discussion extends to the challenges of integrating ATPS into biotransformation processes, including enzyme stability and process optimization. Through comprehensive analysis, this paper aims to provide insights into the future prospects of ATPS in sustainable industrial practices and biotechnological applications.

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Li, Chen Zhe, Hong Yan Xie y Hui Xin Jin. "Extraction Technology for Manganese Sulfate Solution Purification". Engineering Chemistry 1 (30 de marzo de 2023): 45–56. http://dx.doi.org/10.4028/p-6oe21m.

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Manganese sulfate is an important base manganese salt; nearly 80% of the world's manganese products are produced using manganese sulfate or manganese sulfate solution. Furthermore, manganese sulfate has many applications in industry and agriculture; thus, manganese sulfate solution impurity removal technology is important. This study aims to remove impurities from manganese sulfate solution-using complex low-grade manganese ore and manganese-rich fumes after pressure acid leaching to obtain a manganese sulfate solution, which is then purified through iron removal by oxidation neutralization; finally, the purified liquid is treated using extraction-back-extraction. We investigated the effects of various extraction parameters on the extraction rate of manganese, as well as the effects of various back-extraction parameters on the manganese back-extraction rate and manganese ion concentration in the back-extraction solution, and studied the extraction-back-extraction process. We found that the extraction and back-extraction rates of manganese could reach 95% and 96.9%, respectively, under optimal conditions..

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Huseynov, H. J. "Study dearomatization of kerosene by IR and UV spectral analysis". Modern Physics Letters B 35, n.º 12 (23 de febrero de 2021): 2150197. http://dx.doi.org/10.1142/s0217984921501979.

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This work is devoted to study the extraction dearomatization of the kerosene fraction using ionic liquids synthesized on the basis of formic acid and morpholine, as well as acetic acid and diethylamine as a selective solvent. The influence of various factors on the selective purification process has been investigated and the conditions for dearomatization of kerosene have been determined. The group hydrocarbon composition of the dearomatized kerosene raffinate samples by ion-liquid extraction was determined by IR and UV spectral analysis.

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Magda, Ali Akl, Mohammed Youssef Abdul Fatah, Mohammed Ali Mohsen y Ibraheim Amin Mostafa. "Liquid-liquid extraction technique for purification of Egyptian WET process phosphoric acid". Periodica Polytechnica Chemical Engineering 54, n.º 2 (2010): 57. http://dx.doi.org/10.3311/pp.ch.2010-2.01.

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REDDY, M. L. P., T. PRASADA RAO y A. D. DAMODARAN. "Liquid-Liquid Extraction Processes for the Separation and Purification of Rare Earths". Mineral Processing and Extractive Metallurgy Review 12, n.º 2-4 (diciembre de 1993): 91–113. http://dx.doi.org/10.1080/08827509508935254.

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Peng, Sean X., Charles Henson, Michael J. Strojnowski, Adam Golebiowski y Sean R. Klopfenstein. "Automated High-Throughput Liquid−Liquid Extraction for Initial Purification of Combinatorial Libraries". Analytical Chemistry 72, n.º 2 (enero de 2000): 261–66. http://dx.doi.org/10.1021/ac990946v.

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Boulkroune, N. y A. H. Meniai. "Modeling Purification of Phosphoric Acid Contaminated with Cadmium by Liquid-liquid Extraction". Energy Procedia 18 (2012): 1189–98. http://dx.doi.org/10.1016/j.egypro.2012.05.134.

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de Jesus, Sérgio S., Gabriela F. Ferreira, Maria Regina Wolf Maciel y Rubens Maciel Filho. "Biodiesel purification by column chromatography and liquid-liquid extraction using green solvents". Fuel 235 (enero de 2019): 1123–30. http://dx.doi.org/10.1016/j.fuel.2018.08.107.

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Katikaneni, Sai P. R. y Munir Cheryan. "Purification of Fermentation-Derived Acetic Acid By Liquid−Liquid Extraction and Esterification". Industrial & Engineering Chemistry Research 41, n.º 11 (mayo de 2002): 2745–52. http://dx.doi.org/10.1021/ie010825x.

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Lausen, Blake, Anahita Ahang, Scott Cummins y Tianfang Wang. "Investigation of Best Practices for Venom Toxin Purification in Jellyfish Towards Functional Characterisation". Toxins 15, n.º 3 (21 de febrero de 2023): 170. http://dx.doi.org/10.3390/toxins15030170.

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The relative lack of marine venom pharmaceuticals can be anecdotally attributed to difficulties in working with venomous marine animals, including how to maintain venom bioactivity during extraction and purification. The primary aim of this systematic literature review was to examine the key factors for consideration when extracting and purifying jellyfish venom toxins to maximise their effectiveness in bioassays towards the characterisation of a single toxin.An up-to-date database of 119 peer-reviewed research articles was established for all purified and semi-purified venoms across all jellyfish, including their level of purification, LD50, and the types of experimental toxicity bioassay used (e.g., whole animal and cell lines). We report that, of the toxins successfully purified across all jellyfish, the class Cubozoa (i.e., Chironex fleckeri and Carybdea rastoni) was most highly represented, followed by Scyphozoa and Hydrozoa. We outline the best practices for maintaining jellyfish venom bioactivity, including strict thermal management, using the “autolysis” extraction method and two-step liquid chromatography purification involving size exclusion chromatography. To date, the box jellyfish C. fleckeri has been the most effective jellyfish venom model with the most referenced extraction methods and the most isolated toxins, including CfTX-A/B. In summary, this review can be used as a resource for the efficient extraction, purification, and identification of jellyfish venom toxins.

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Yusree, Farhana Iylia Fatinee Mohd, Angela Paul Peter, Mohd Zuhair Mohd Nor, Pau Loke Show y Mohd Noriznan Mokhtar. "Latest Advances in Protein-Recovery Technologies from Agricultural Waste". Foods 10, n.º 11 (9 de noviembre de 2021): 2748. http://dx.doi.org/10.3390/foods10112748.

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In recent years, downstream bioprocessing industries are venturing into less tedious, simple, and high-efficiency separation by implementing advanced purification and extraction methods. This review discusses the separation of proteins, with the main focus on amylase as an enzyme from agricultural waste using conventional and advanced techniques of extraction and purification via a liquid biphasic system (LBS). In comparison to other methods, such as membrane extraction, precipitation, ultrasonication, and chromatography, the LBS stands out as an efficient, cost-effective, and adaptable developing method for protein recovery. The two-phase separation method can be water-soluble polymers, or polymer and salt, or alcohol and salt, which is a simpler and lower-cost method that can be used at a larger purification scale. The comparison of different approaches in LBS for amylase purification from agricultural waste is also included. Current technology has evolved from a simple LBS into microwave-assisted LBS, liquid biphasic flotation (LBF), thermoseparation (TMP), three-phase partitioning (TPP), ultrasound-assisted LBS, and electrically assisted LBS. pH, time, temperature, and concentration are some of the significant research parameters considered in the review of advanced techniques.

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Abbasov, V. M., L. I. Alieva, G. A. Isayeva, P. A. Movsumova y S. S. Süleymanova. "Results of research in the field of purification of Naftalan oil fractions with appropriate solvents". Azerbaijan Oil Industry, n.º 05 (15 de mayo de 2024): 42–48. http://dx.doi.org/10.37474/0365-8554/2024-05-42-48.

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Oil fraction samples were selected from individual wells of the Naftalan field. The physicochemical, spectral properties and structure of fractions obtained from mixtures of Naftalan oil were determined by using modern methods of analysis. For purification of Naftalan oil fractions from aromatic and sulfur compounds, an extraction process was carried out with ionic liquids (morpholineformate, diethylamineformate, triethylamineformate, pyridineformate, N-methyl-2-pyrrolidoneformate, piperidineformate, anylinformate), as well as and N-methyl-2-pyrrolidone extractants. In the obtaining of therapeutic “White Naftalan” oil from a fraction of Naftalan oil boiling at 200–450 °C, the purification process with ionic liquid morpholineformate in a mass ratio oil fraction: ionic liquid – 1:1, at a temperature of 60 oC, was carried out in 4 stages, with the contact time of 1 hour for each stage. In the purification proces the amount of aromatic hydrocarbons decreased and was 2 %, and the raffinate yield was 72.65 %. was. Thus, according to the results of IR, UV spectral analysis of the morpholineformate ionic liquid can be considered an economically and environmentally effective extractant in the obtaining of therapeutic “White Naftalan” oil.

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