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    Effect of binary extractants and modifier-diluents systems on equilbria of propionic acid extraction
    (Elsevier, 2009) Keshav, Amit; Wasewar, Kailas L.; Chand, Shri; Uslu, Hasan
    Propionic acid is an important carboxylic acid widely used in chemical industries. The recovery from aqueous waste streams and fermentation broth is of research interest. Extraction of carboxylic acids by reactive extraction using extractant-diluent, mixed extractants in diluents and extractants in mixed diluents etc. are emerging areas of study. With this aim reactive extraction of propionic acid was carried out to study: (i) effect of binary extractants (tri-n-octylamine(TOA):tri-n-butylphosphate (TBP), TOA:Aliquat 336 and TBP:Aliquar 336), (ii) effect of modifier (1-decanol) in different diluents (kerosene, n-octane. n-heptane. petroleum ether, butyl acetate, MIBK. 2-octanol. dodecanol, hexane) and (iii) effect of phase volume. Improved extractions using binary extractants and binary diluents were observed. Since liquid-liquid extraction is dependent on effect of modifier concentration, effect of phase volume, presence of single or binary extractants and binary diluents, the Study will be useful in the design of reactive extraction process for propionic acid recovery. (C) 2008 Elsevier B.V. All rights reserved.
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    Extractive Separation of Pentanedioic Acid by Amberlite LA-2 in Various Solvents
    (Amer Chemical Soc, 2016) Uslu, Hasan; Bamufleh, Hisham S.; Keshav, Amit; Pal, Dharm; Demir, Goksel
    Reactive extraction of pentanedioic acid using Amberlite LA-2 in different diluents, such as hexane, methylbenzene, kerosene, 4-methyl-2-pentanone, 2,6-dimethyl-4-heptanone, n-hexanone, 3-methyl-1-butanol, n-octanol, nnonanol, and n-decanol, respectively, was studied. At lower amine concentrations, K-D values of less than 1 were obtained but it improves as amine concentration was raised. Increase in amine concentration was found to increase the KD by 80-85% in inert diluents (hexane, methylbenzene and kerosene). In the chosen ketones, the extraction percentage follows the following trend 4-methyl-2-pentanone > DIBK > n-hexanone. Among the various diluents used, higher KD was obtained when alcohols were used as diluents. Mass action equilibria, linear solvation energy relationship modeling, and differential evolution (DE) was applied for estimating the model parameter and compare the model values with the experimental results of extraction equilibria.