US EPA

1549242 

Journal Article 

Stability studies of poly(vinyl chloride)-based polymer inclusion membranes containing Aliquat 336 as a carrier 

Kagaya, S; Ryokan, Y; Cattrall, RW; Kolev, SD 

2012 

1 

Separation and Purification Technology
ISSN: 1383-5866 

101 

69-75 

English 

10.1016/j.seppur.2012.09.007 

WOS:000311703100010 

http://://WOS:000311703100010
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The stability of poly(vinyl chloride)-based polymer
inclusion membranes (PIMs) containing 40%(w/w) Aliquat 336 (R3MeN+Cl-) and 60%(w/w) PVC is
studied in detail when these membranes are immersed in deionized water and in aqueous solutions
containing various salts or hydrochloric acid. It is shown that the mass loss is suppressed in
the salt solutions and that the effectiveness of the suppression follows the order: NaClO4 >
NaNO3 > NaSCN > NaCl approximate to LiCl approximate to HCl > Na2SO4 > CH3COONa. It is also
demonstrated that the distribution ratio of R3MeN+X- (where X- is Cl- or NO3-) between the PIM
and the aqueous solution depends on the concentration of the ""common anion"" X- in the solution.
However, in every case, the PIM eventually reaches an equilibrium with the aqueous solution, and
after that the PIM composition remains stable. The ion-exchange equilibrium constants between Cl-
on one hand and NO3- or SO42- on the other are reported to be Kie-NO3 = 1.8 x 10(1) and Kie-SO4 =
1.5 x 10(-2), respectively. The results reported in this study suggest that although PlMs are
capable of losing some membrane liquid phase when exposed to aqueous solutions, this loss can be
minimized or even eliminated by increasing the solution concentration of the common anion. (c)
2012 Elsevier B.V. All rights reserved. 

Polymer inclusion membrane (PIM); Aliquat 336; PIM stability; PIM mass change; PIM anion exchange reaction