Facilitated Transport Of Lactic Acid And Its Ethyl Ester By
Supported
Liquid Membranes Containing Functionalized
Polyorganosiloxanes As
Carriers
Yahaya, GO; Brisdon, BJ; England, R
ELSEVIER SCIENCE BV, JOURNAL OF MEMBRANE SCIENCE; pp: 187-201; Vol: 168
King Fahd University of Petroleum & Minerals
http://www.kfupm.edu.sa
Summary
The
feasibility
of
using
hydrophobic
fluid
organosiloxane,
Me3SiO(MeSi(OR)O)(x)(Me2SiO)(y)SiMe3 polymer (containing x=4, 11 or 30
mol% of R=-(CH2)(3)NMe2 (amine); -(CH2)(2)OEt (ether); -(CH2)(5)COOEt
tester); or -(CH2)(4)Me talkyl), side-arm organofunctional groups) as integrated
solvent/carrier supported liquid membranes (SLMs) for the recovery from aqueous
phases of lactic acid and its ethyl ester has been investigated. The carriers are capable
of interacting specifically with the required product in a complex mixture. The ethyl
ester of lactic acid undergoes pH driven facilitated transport through both ether and
amine functionalized polyorganosiloxane/celgard K-273 SLMs resulting in a dramatic
permeability enhancement compared with that displayed by the free acid. The pH
driven facilitated flux of the ester is directly proportional to the substrate
concentration, and it is also greatest at low amine and ether functional group loadings.
Both amine and ether functionalized polyorganosiloxane/celgard SLMs were found to
be stable throughout the duration of the experiments tup to 100 h). (C) 2000 Elsevier
Science B.V. All rights reserved.
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Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa