Recovery of carboxylic acids produced by fermentation

Lactic acid is an important commercial product and extracting this from aqueous solution is a growing requirement in fermentation-based industries. The design of an amine extraction process requires (i) equilibrium and (ii) kinetic data for the acid-amine (solvent) system used. The equilibrium complexation constants for ratios of (1:1) and (2:1) have been estimated. The kinetics of extraction of lactic acid by Alamine 336 in decanol has also been determined. The reaction between lactic acid and Alamine 336 in decanol in a stirred cell falls in Regime 3, ie extraction accompanied by a fast chemical reaction occurring in the diffusion film. The reaction has been found to be zero order in Alamine 336 and first order in lactic acid with a rate constant of 0.21 s-1. These data will be useful in the design of extraction processes.

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Equilibria and kinetics for reactive extraction of lactic acid using Alamine 336 in decanol

Acidic sulphate leaching of chalcopyrite concentrates in presence of pyrite

Modeling and optimization of tartaric acid reactive extraction from aqueous solutions: A comparison between response surface methodology and artificial neural network

The prospective function of a novel energy efficient fermentation technology has been getting great attention in the past fifty years due to the quick raise in petroleum costs. Fermentation chemicals are still limited in the modern market in huge part because of trouble in recovery of carboxylic acids. Therefore, it is needed considerable development in the current recovery technology. Carboxylic acids have been used as the majority of fermentation chemicals. This paper presents a state-of-the-art review on the reactive extraction of carboxylic acids from fermentation broths. This paper principally focuses on reactive extraction that is found to be a capable option to the proper recovery methods.

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Status of the Reactive Extraction as a Method of Separation

Kinetics, mechanism and mathematical modelling of extraction of citric acid with isodecanol/n-paraffins solutions of trioctylamine

Extraction equilibria of citric acid from aqueous solutions with trioctylamine in isodecanol/n-parafrins mixtures, were studied as a function of acid, amine and isodecanol concentrations at 25°C. The equilibrium data were interpreted by “chemical modeling” approach in which existence of (1,1) and (1,2) acid-amine complexes in the organic phase, were assumed. The corresponding equilibrium constants, which represent the experimental results the best, were determined.Simpler mathematical model which refer to modified Langmuir isotherm, was also used for interpretation of the equilibrium data. Extraction constants and overall acid stoichiometric coefficient, which represent the experimental results the best, were determined. This mathematical form could be suitable in the analysis and design of the process in dynamic conditions.

Equilibria and Mathematical Models of Extraction of Citric Acid with Isodecanol/n-Parrafins Solutions of Trioctylamine

Extraction of tartaric acid from aqueous solutions with tri-iso-octylamine (HOSTAREX A 324). Equilibrium and kinetics

Leaching of a low-grade chalcocite-covellite ore containing iron in sulphuric acid: The influence of pH and particle size on the kinetics of copper leaching

The dependence of extraction equilibrium on pH of the aqueous phase was studied in the system: aqueous solution of D-tartaric acid - solution of trialkylamine (TAA) in binary diluent. TAA was a mixture of tertiary amines with C 7 -C 9 carbon chains, the binary diluent was a mixture of w=0.7 of n-octan-1-ol in n-heptane. Measurements were performed at three levels of equilibrium pH 2.0, 2.5 and 3.0, the pH value required being adjusted with aqueous sodium hydroxide solution. The range of pH values and of acid concentrations investigated was limited by the low solubility of the sodium hydrogentartrate forming. In the range of pH values examined an increase of acid extraction with increasing pH was found, if only free acid in the aqueous phase was taken into account. The results of the extraction at constant initial total acid molality and varying pH exhibited diverse trends according to the way of expressing the degree of extraction. All these effects could be explained by assuming that only the free, undissociated acid can be extracted.

Filimena A. Poposka

Papers

Kinetics, mechanism and mathematical modelling of extraction of citric acid with isodecanol/n-paraffins solutions of trioctylamine

Equilibria and Mathematical Models of Extraction of Citric Acid with Isodecanol/n-Parrafins Solutions of Trioctylamine

Extraction of tartaric acid from aqueous solutions with tri-iso-octylamine (HOSTAREX A 324). Equilibrium and kinetics

Leaching of a low-grade chalcocite-covellite ore containing iron in sulphuric acid: The influence of pH and particle size on the kinetics of copper leaching

pH dependence of tartaric acid extraction