Mm. Hossain, Mass transfer studies of amino acids and dipeptides in AOT-oleyl alcohol solution using a hollow fiber module, SEP PURIF T, 18(1), 2000, pp. 71-83
The mass transfer of amino acids [tryptophan (Trp), phenylalanine (Phe) and
dipeptides (tryptophan-leucine (Trp-Leu), phenylalanine-leucine (Phe-Leu)]
was studied by using a hollow fiber module (HFM). The membrane module (2.5
cm diameter x 20 cm long) has a shell-and-tube configuration and allows fl
ow of two streams in the fiber and shell sides. The liquid membrane contain
ed an ionic carrier, Aerosol OT (AOT), dissolved in oleyl alcohol. The modu
le was operated by both the membrane extraction and supported liquid membra
ne (SLM) mode. In the SLM mode, the organic solution was loaded inside the
micropores and a 'feed' solution (an aqueous solution containing the target
solutes) and a 'strip' solution (containing sodium chloride) were circulat
ed through the shell and fiber sides, respectively. The results were not en
couraging so the experiments were performed in the membrane extraction mode
. This was done by recirculating the feed and the organic solutions through
the shell and fiber sides, respectively. The effects of recirculation flow
rate, initial feed pH and concentration on the percentage extraction have
been determined. The equilibrium reactions at the interfaces and mass trans
fer from the fiber side to the shell side were analyzed with a simple theor
etical model. The distribution coefficient was obtained from two-phase part
ition experiments and used to calculate the overall mass transfer coefficie
nt. (C) 2000 Elsevier Science B.V. All rights reserved.