Removal of low molecular organic acids from aqueous solutions with reactive extraction

Abstract

This paper presents investigation on removal of low molecular organic acids (acetic, lactic, succinic and fumaric) from aqueous solutions with reactive extraction. The results specifi cally show that the extraction effi ciency of acids depends on the type of extractant, diluents of the organic phase and the initial pH of the aqueous phase. It is possible to separate succinic or fumaric from lactic and acetic acids with high selectivity with the use of TOA and Aliquat 336, respectively. Increasing the pH of the aqueous phase results in a reduction of fumaric acid extraction effi ciency with solvating extractants. This can be explained by the decreasing share of acidic form, whose extraction is favored by these extractants. Effi cient extraction of both fumaric acid and fumarate using Aliquat 336 can be explained by the ionic structure of the quaternary ammonium salt, capable of transporting both forms of the acid.

Study on Oxalic Acid Extraction by Tripropylamine: Equilibrium and Computational COSMO-SAC Analysis

“…Reactive extraction method that depends on the chemical reaction between the solute and extractant molecules is an effective separation procedure because the desired component can be obtained with high purity, more selectivity, effective pH control of the fermentation process, low optional component arrangement, and low energy utilization. , Because of that, numerous investigations were carried out on the refinement of organic acids from aqueous phases utilizing the reactive extraction method. − In the reported investigations, a few parameters were inspected, for example, starting acid amounts, the effect of the diluents, the effect of pH, and so on on the extraction system. These parameters are also the main parameters that have been investigated using other separation methods. − …”

Comparison of Extractability of Oxalic Acid from Dilute Aqueous Solutions Using Dioctylamine and Trioctylphosphine Oxide

“…The reactive extraction technique that relies on the chemical interaction between the solute and extractant molecule is an encouraging separation method due to the product formation with high purity, high selectivity, and efficient pH control of the fermentation media, low secondary product formation, and low energy consumption since many investigations were performed for the purification of organic acids from aqueous solutions via reactive extraction. − In these studies, several parameters have been observed such as initial acid concentration, the effect of the diluents, the effect of the pH, etc. on the extraction process.…”