Recovery of Carboxylic Acids From Aqueous Solutions by Liquid-Liquid Extraction With a Triisooctylamine Diluent System

Abstract

Tertiary alkylamines in solution with organic diluents are attractive extractants for the recovery of carboxylic acids from dilute aqueous phases. The aim of this study was to investigate the mechanism for extraction of organic acids from water by a long-chain aliphatic tertiary amine. In order to attain this objective, we studied the liquid-liquid equilibria between the triisooctylamine + 1-octanol + n-heptane system as solvent and an aqueous solution of an individual carboxylic acid such as citric, lactic and malic acids. The experiments showed that the partition coefficient for a particular organic acid depends on the kind of solute, notably when the acid concentration in the aqueous phase is low. A mathematical model, where both chemical association and physical distribution are taken into consideration, is proposed. The model suggests that the various complexes obtained between amine and organic acids contribute to the distribution of the solute between the coexisting phases in equilibrium

A novel solid-state fractionation of naphthenic acid fraction components from oil sands process-affected water

“…Solvent-solvent extraction processes represent a well-established and high throughput method for the separation of inorganic and organic compounds, as evidenced by some selected studies (Malmary et al, 2001;Zakhodyaeva and Voshkin, 2013;Banda and Lee, 2014). Herein, this study was focused on the utility of adsorbent technology for solid-solution systems as a potential alternative separation method for a range of sorbent materials (GAC, biochar, PANI, cellulose and iron oxides).…”

Reactive Extraction as an Intensifying Approach for the Recovery of Organic Acids from Aqueous Solution: A Comprehensive Review on Experimental and Theoretical Studies

“…Table 4. Reactive Extraction of Organic Acids with Aminic Extractants extractant used organic acid/salt of organic acid tri-iso-octyl amine (TIOA) tartaric acid, 125 citric acid, 130 lactic acid, 130 malic acid 130 trialkyl amine (alamine 336, N235) acetic acid, 76 phenyl acetic acid, 131 lactic acid, 76,126 succinic acid, 76 malonic acid, 76 fumaric acid, 76 maleic acid, 76 citric acid, 70,132−134 isonicotinic acid, 135 penicillin G, 136 picolinic acid 137 n-lauryl trialkyl-methyl amine (Amberlite LA-2)…”

“…Assuming the interaction of one undissociated acid molecule (H x A) with n numbers of extractant molecules (S̅) occurs by hydrogen bonding, eq can represent the reaction. where H x A represents the undissociated mono, di, and tricarboxylic acids.…”

Process Intensification for Separation of Carboxylic Acids from Fermentation Broths using Reactive Extraction

“…Equilibria and Kinetics for lactic acid extraction by alamine 336 in methyl -iso -butyl ketone (MIBK) as a diluent have been studied by Wasewar et al [44]. Malmary et al [45] proposed experimental and mathematical studies for recovery of carboxylic acids from aqueous solutions by liquid-liquid Extraction with a triisooctylamine diluent system. They studied the liquid-liquid equilibria between the triisooctylamine + 1-octanol + n-heptane system as solvent and an aqueous solution of an individual carboxylic acid such as citric acid, lactic acid and malic acid.…”