Equilibrium Studies for Extraction of Propionic Acid Using Tri-n-Butyl Phosphate in Different Solvents

Abstract

Propionic acid extraction from the aqueous phase is important in view of its number of uses. The recovery technique should provide high selectivity and yield. A number of techniques like distillation, membrane, dialysis, electrodialysis, and reactive extraction are available. The profound success of reactive extraction has been noted in the recovery of carboxylic acids from dilute solutions. In the present paper, equilibrium with propionic acid using tri-n-butyl phosphate, an organophosphorous compound, in eight different diluents (1-dodecanol, benzene, toluene, heptane, hexane, butyl acetate, petroleum ether, and paraffin liquid) has been studied. Equilibrium parameters such as distribution coefficients, loading ratio, degree of extraction, and equilibrium complexation constants have been presented. The data obtained are useful in understanding the equilibrium characteristics and efficient design of the recovery process of propionic acid by reactive extraction.

Equilibrium Study on Reactive Extraction of Nicotinic Acid from Aqueous Solution

“…Higher concentrations of TOA in diluents may have some interactions with diluents, which leads to decrease in the extraction efficiency. These trends of degree of extraction are also observed for the reactive extraction of acids by [10], [11]. Initial concentration of acid also affects the extraction efficiency as shown in Fig.…”

Recovery of propionic acid by reactive extraction - 1. Equilibrium, effect of pH and temperature, water coextraction

“…Reactive extraction is one of the states of art technology for the recovery of carboxylic acids. In Downloaded by [University of Sussex Library] at 11:06 07 February 2015 reactive extraction, aliphatic amines and organo phosphorous compounds in diluents are used as reactive extractants that can provide higher recovery of acid in comparison to extraction techniques by employing conventional diluents like alcohols, ethers, esters or aliphatic and aromatic hydrocarbons [3][4][5][6][7][8][9][10]. For complete design of reactive extraction, equilibrium, kinetic, thermodynamic, pH and water coextraction data are required.…”

Reactive extraction of propionic acid using tri‐n‐octylamine, tri‐n‐butyl phosphate and aliquat 336 in sunflower oil as diluent

“…These results demonstrate that good extraction and recovery of lactic acid can be obtained. Some work on reactive extraction of propionic acid using organophosphorous compounds 19,20 and amines 3 -5,11,21 can be found in the literature but no work on the use of a natural non-toxic diluent (sunflower oil) could be found. In view of this, in the present study, the reactive extraction of propionic acid was carried out using Aliquat 336, TBP, and TOA and their mixed binary solutions in sunflower oil.…”