Extraction of carboxylic acids with amine extractants. 2. Chemical interactions and interpretation of data

Stoichiometric and Spectroscopic Study of Reactive Extraction of Phenylacetic Acid with Tri-n-Butyl Phosphate

“…Scare literature is available on spectroscopic studies between acid-extractant complex 20,[33][34][35] and reactive extraction of phenylacetic acid. [36][37][38] In the present work, the data on stoichiometric and spectroscopic analysis of reactive extraction of phenylacetic acid with tri-n-butyl phosphate at interface of aqueous and organic phase the data are presented in terms of extraction efficiency, distribution coefficient, loading factor, and overall equilibrium constant.…”

“…The distillation method is a well-established technology, but its drawbacks involve formation of high-boiling internal esters, dimers, and greater power consumption. [20][21][22][23][24][25] Reactive extraction with the proper selection of diluents and extractants can provide high selectivity and extraction but suffers from toxicity problems of solvents toward microbial strains. Selection of an extractant and diluent for reactive extraction should be on the basis of minimal toxicity and maximum capacity.…”

Optimal Reactive Extraction of Valeric Acid from Aqueous Solutions Using Tri- n -propyl amine/Diluent and Dibenzyl amine/Diluent Systems

“…Inherent to this uncoupling, the complementary solvation effect of an oxygen-containing, substituted aromatic or aliphatic diluent is considered to be an important complexation factor. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] However, the experimental findings of Yang et al 4 and Senol et al [7][8][9][10][11][12][13][14] give evidence for the reversible complexation between the tertiary amine and the non-dissociated part of the acid in the organic phase being overly sensitive to the solvation efficiency of diluent. The extraction power of an amine/diluent system has been found to decrease in the order: valeric acid > butyric acid > propionic acid > levulinic acid > acetic acid > formic acid.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] The amine extractants have been widely used for the extractive recovery of carboxylic acids from aqueous solutions, such as fermentation broth and wastewater including lower than 10 % (w/w) acid content. [1][2][3][4][5][6][7][8] The experimental findings of King and co-workers [1][2][3] and Senol and co-workers [7][8][9][10][11][12][13][14] have revealed that the characterization of acid-amine complexation is intimately connected to the polarity and hydrogen bonding affinity of diluent. Three major factors have been found to influence the equilibrium characteristics of amine extraction of carboxylic acids from aqueous solutions, i.e., the nature of acid, concentrations of the acid and extractant, and the type of diluent.…”

“…Three major factors have been found to influence the equilibrium characteristics of amine extraction of carboxylic acids from aqueous solutions, i.e., the nature of acid, concentrations of the acid and extractant, and the type of diluent. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Simultaneously, the influence of additional controlling factors, such as temperature, pH, swing effect of a mixed diluent and a third phase formation can also modify the reversible complexation stage. 15 The implementation of amine extraction method argues an uncoupling of the behaviors relative to the diluent/ complex interaction from the physical solubility of the acid to establish a sentence structure distinguishing the dominating factors of extraction.…”