@article { ISI:000255421300007, title = {Rapid liquid-liquid extraction of thallium(III) from succinate media with 2-octylaminopyirdine in chloroform as the extractant}, journal = {Journal of the Serbian Chemical Society}, volume = {73}, number = {4}, year = {2008}, month = {JAN}, pages = {435-451}, publisher = {SERBIAN CHEMICAL SOC}, address = {KARNEGIJEVA 4, PO BOX 462, YU-11001 BELGRADE, YUGOSLAVIA}, abstract = {

A simple solvent extraction study of thallium(III) was conducted. Selective and quantitative extraction of thallium(III) by 2-octylaminopyridine (2-OAP) in chloroform occurred from aqueous sodium succinate medium (0.0075 M) at pH 3.0. Thallium(III) was back extracted with acetate buffer (pH 4.63). The effect of the concentration of succinate and 2-OAP, the role of various diluents, stripping agents, loading capacity of 2-OAP, equilibrium time and aqueous:organic volume ratio on the extraction of thallium(III) was studied. The stoichiometry of the extracted species was determined based on the slope analysis method and found to be 1: 2: 1 (metal: acid: extractant). The temperature dependence of the extraction equilibrium constant was also examined to estimate the apparent thermodynamic functions Delta H, Delta G and Delta S for the extraction reaction. The method is free from interference of a large number of cations and anions. The method was used for the selective extraction of thallium(III) from its binary mixture with Zn(II), Cd(II), Hg(II), Bi(ill), Pb(II), Se(IV), Te(IV), Sb(III), Ga(III), In(III), AI(III), TI(I) and Fe(III). The proposed method was applied to the synthetic mixtures and alloys. It is simple, selective, rapid and eco-friendly.

}, keywords = {2-OAP, liquid-liquid extraction, succinate media, Temperature effect, thallium(III)}, issn = {0352-5139}, doi = {10.2298/JSCO804435M}, author = {Mahamuni, Sandip V. and Wadgaonkar, Prakash P. and Anuse, Mansing A.} } @article { ISI:000263939200021, title = {Solvent extraction of trivalent indium from succinate solution by 2-octylaminopyridine in chloroform}, journal = {Journal of the Iranian Chemical Society}, volume = {6}, number = {1}, year = {2009}, month = {MAR}, pages = {200-212}, publisher = {IRANIAN CHEMICAL SOC}, address = {NO 7, MARAGHEH ST, OSTAD NEJATOLLAHI AVE, PO BOX 15875-1169, TEHRAN, 00000, IRAN}, abstract = {

Extraction processes of indium(III) with 2-octylaminopyridine (2-OAP) from media of various complexing ability, succinate and salicylate, in chloroform have been elucidated. The ion-pair complex has also quantitative extraction in xylene and 1,2-dichloroethane. Indium(III) from organic phase was stripped with 1.0 M hydrochloric acid and determined complexometrically with EDTA. The stoichiometry of the extracted species was found out on the basis of slope analysis. The extraction of indium(III) proceeds by an anion exchange mechanism and the extracted species is [RR{\textquoteright}NH(2)(+)In(succinate)(2)(-)]((org)). Temperature dependence of the extraction equilibrium constant was also examined to estimate the apparent thermodynamic functions (Delta H, Delta G and Delta S) for extraction reaction. It is possible to separate indium(III) from Zn(II), Cd(II), Pb(II), Hg(II), Bi(III), Tl(I), Tl(III), Ga(III), Al(III), Te(IV), Se(IV), Sb(III), Fe(III) and Sn(IV). The method is simple, rapid and reproducible and can be used to determine the indium from samples like alloys.

}, keywords = {2-OAP, Binary separations, Indium(III), liquid-liquid extraction, Sodium succinate}, issn = {1735-207X}, author = {Mahamuni, Sandip V. and Kolekar, S. S. and Wadgaonkar, P. P. and Anuse, Mansing A.} } @article { ISI:000281683900009, title = {Liquid-liquid extraction and recovery of gallium(III) from acid media with 2-octylaminopyridine in chloroform: analysis of bauxite ore}, journal = {Journal of the Serbian Chemical Society}, volume = {75}, number = {8}, year = {2010}, month = {Apr}, pages = {1099-1113}, publisher = {SERBIAN CHEMICAL SOC}, address = {KARNEGIJEVA 4, 11 120 BELGRADE, SERBIA}, abstract = {

The liquid liquid extraction of gallium(III) from hydrochloric acid solution using 2-octylaminopyridine (2-OAP) in chloroform was investigated. The extraction of gallium(III) from 6.0-9.0 mol dm(-3) hydrochloric acid was found to be quantitative using 0.033 mol dm-3 2-OAP in chloroform. The effect of the reagent concentration and other parameters on the extraction of gallium(111) was also studied. The stoichiometry of the extracted species of gallium(In) was determined based on the slope analysis method. The extraction reaction proceeded via the anion exchange mechanism from hydrochloric acid and the extracted species was [RR{\textquoteright}NH(2)(+)GaCl(4)(-)](org). The extraction of gallium(III) was performed in the presence of various ions to ascertain the tolerance limit to individual ions. The temperature dependence of the extraction equilibrium constants was examined to estimate the apparent thermodynamic functions (Delta H, Delta S and Delta G) for the extraction reaction. Gallium(III) was successfully separated from commonly associated metal ions, such as Zn(II), Pb(II), Cd(II), Hg(II), Bi(III), Al(III), Se(IV), Sb(III), Sn(IV), In(III), TI(I) and TI(III). However, gallium(III) was separated from Fe(III) from weak organic acid media. The procedure was also extended to the determination of gallium(III) in bauxite ore by the standard addition method.

}, keywords = {2-OAP, gallium(III), liquid-liquid extraction, recovery of gallium from bauxite}, issn = {0352-5139}, doi = {10.2298/JSC090630072M}, author = {Mahamuni, Sandip V. and Wadgaonkar, Prakash P. and Anuse, Mansing A.} } @article { ISI:000309333600007, title = {Downstream processing of extracellular phytase from aspergillus niger: chromatography process vs. aqueous two phase extraction for its simultaneous partitioning and purification}, journal = {Process Biochemistry}, volume = {47}, number = {7}, year = {2012}, month = {JUL}, pages = {1066-1072}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

The application of single step aqueous two-phase extraction (ATPE) for the downstream processing of phytase from Aspergillus niger NCIM 563, produced under solid state fermentation, has been studied and compared with the traditional multi-step procedure involving salt precipitation and column chromatography. High phytase recovery (98.5\%) within a short time (3 h) and improved thermostability was attained by ATPE in comparison to 20\% recovery in 96 h by chromatography process.The ATPE method, therefore, seems to be an interesting alternative for simultaneous partitioning and purification of phytase. The influence of system parameters; such as, phase forming salts, polymer molecular weight and system pH on the partitioning behavior of phytase was evaluated. The ATPE system consisting of combination of polyethylene glycol (PEG) 6000 and 8000(10.5\%) and sodium citrate (20.5\%) resulted in one-sided partitioning of phytase in bottom phase with a purification factor of 2.5. This is the first report on phytase purification using liquid-liquid extraction and the results are likely to be beneficial in the poultry feed industry. (c) 2012 Elsevier Ltd. All rights reserved.

}, keywords = {Aspergillus niger, liquid-liquid extraction, Phytase, Polyethylene glycol, Purification}, issn = {1359-5113}, doi = {10.1016/j.procbio.2012.03.012}, author = {Bhavsar, Kavita P. and Kumar, V. Ravi and Khire, Jayant Malhar} } @article { ISI:000345295000016, title = {Two-phase flow in metal monoliths: hydrodynamics and liquid-liquid extraction}, journal = {Canadian Journal of Chemical Engineering}, volume = {92}, number = {12}, year = {2014}, month = {DEC}, pages = {2166-2175}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

This work aims to explore the application of metal monoliths as a scale-up option for efficient liquid-liquid extraction. The pressure drop, mass transfer and residence time distribution are measured for low Ca (approximate to 10(-5)) with monoliths having three different cell densities. The cross-over section between two monoliths was seen to enhance mixing in the column. However, the RTD of two-phase liquid-liquid up-flow was inferior to the single phase RTD. For higher cell density substrates, the cross-over zones seem to cause trapping of slugs due to non-superimposing channel ends. Relatively high shear rates through the film of continuous phase helped enhance the mass transfer rates, thereby helping to achieve the desired extraction in a short column. The entrance sections and cross-over zones between the monoliths adversely affected the extraction for higher cell density monoliths. The analysis of data supports use of low cell density monolith for better performance and scale up.

}, keywords = {capillary, hydrodynamics, liquid-liquid extraction, monolith, slug flow}, issn = {0008-4034}, doi = {10.1002/cjce.22081}, author = {Deshpande, Jaydeep B. and Gosavi, Abha and Kulkarni, Amol A.} } @article {46678, title = {Solvent extraction of butanol from synthetic solution and fermentation broth: batch and continuous studies}, journal = {Separation and Purification Technology}, volume = {249}, year = {2020}, month = {OCT}, pages = {117058}, type = {Article}, abstract = {

Product recovery is one of the essential finishing steps to any commercial fermentation process. In acetone-butanol-ethanol (ABE) fermentation, butanol recovery is quite tedious mainly due to dilute product and multiple byproduct formation in complex media. Among different recovery methods, extraction has attracted considerable attention in biofuel recovery owing to its high selectivity, low energy consumption, and ease of operation. In present work, the butanol extraction performance from synthetic solvent mixture containing ABE was tested in batch and continuous operations using 20\% (v/v) decanol in oleyl alcohol. The optimized extraction conditions were then validated using actual fermentation broth to confirm effectiveness of the extraction operation. The distribution coefficient (K-d) and batch extraction efficiency (E) were in the range of 5.60-9.80 and 87.70-86.90\% for fermentation broth and synthetic solution, respectively for a given initial concentration of butanol in the aqueous phase. Further, E was relatively improved by supplementing different inorganic salts. Sodium hydroxide (5\%, w/v) was highly effective to recover butanol from fermentation broth (E similar to 97.70\%) with K-d of 33.10. Besides, the continuous counter current extraction of butanol in a packed column was performed. The volumetric mass transfer coefficient (kLa) was estimated to be 0.025 1/min at an optimized superficial velocity of the aqueous phase (0.28 cm/min) and sodium hydroxide concentration (5\%, w/v). Height of the extraction column was estimated to be 28.32 cm using height of transfer unit (HTU) and number of transfer unit (NTU) concept for extraction efficiency of 97.20\%. Overall, the present study has demonstrated an enhanced extraction efficiency of butanol from fermentation broth.

}, keywords = {Biobutanol, Equilibrium stages, Height of transfer unit, liquid-liquid extraction, mass transfer coefficient, Number of transfer unit}, issn = {1383-5866}, doi = {10.1016/j.seppur.2020.117058}, author = {Khedkar, Manisha A. and Nimbalkar, Pranhita R. and Gaikwad, Shashank G. and Chavan, V, Prakash and Bankar, Sandip B.} }