ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Membrane-Based Extraction Joined with Membrane-Based Stripping in a Circulating Arrangement I. Modelling of Mass Transfer in a Hollow Fibre Contactor

M. Vajda

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: 24 January 2002

Abstract: A simple model is developed for the determination of the overall coefficients of extraction and stripping, K_e,K_s, in membrane-based extraction joined with membrane-based stripping (reextraction) in circulating arrangement. Ideally mixed phases in the reservoirs are demanded. The calculation of mass transfer in hollow fibre contactors was based on integral equations for steady-state conditions. The equations of mass balance in the reservoirs (ordinary differential equations) together with equations for the calculation of exit concentrations of the transferred component in the phases flowing from the contactors (integral equations) formed a set of model equations. The overall coefficients are calculated from the time dependences of concentrations in both the feed and the solvent, or the stripping reservoirs. Constant flows of phases through hollow fibre contactors and constant volumes of phases in the reservoirs are supposed. The nonlinear dependence of partition coefficients, D_F, D_R, on concentration of the transferred component can be used.

Full paper in Portable Document Format: 565a288.pdf

Chemical Papers 56 (5) 288–294 (2002)