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Membrane-Based Extraction Joined with Membrane-Based Stripping in a Circulating Arrangement II. Extraction of Organic Acids

M. Vajda, E. Sabolová, Š. Schlosser, and E. Mikulová

Department of Chemical and Biochemical Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37 Bratislava

 

E-mail: vajdam@cvt.stuba.sk

Received: 26 March 2002

Abstract: The paper presents an experimental veri cation of a simple model for a circulating arrangement of extraction joined with stripping (re-extraction) developed in Part I. Membrane-based extraction connected with simultaneous membrane-based stripping of organic acids was performed. The original derivative equations for both stripping and solute phases were modi ed into a new form. This form of the model equations reflects the fact that for a system with a very high value of the distribution coecient, model equations are independent of the arrangement of flow through the contactor. Both butyric acid and 5-methyl-2-pyrazinecarboxylic acid (MPCA) were extracted from aqueous solutions by TOA diluted in alkanes or xylene and successively stripped by an aqueous solution of sodium hydroxide. For both systems time courses of the concentration of carboxylic acids were used. By tting the experimental time dependences of concentrations of transferred component in the feed, solute and stripping phase containers, the values of model parameters, namely extraction mass transfer coeficient, Ke, and the stripping mass transfer coeficient Ks, were obtained.

Full paper in Portable Document Format: 571a3.pdf

 

Chemical Papers 57 (1) 3–10 (2003)

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