CO2 plasticization of polyethersulfone/polyimide gas-separation membranes

被引:63
作者
Kapantaidakis, GC
Koops, GH [1 ]
Wessling, M
Kaldis, SP
Sakellaropoulos, GP
机构
[1] Univ Twente, Fac Chem Technol, NL-7500 AE Enschede, Netherlands
[2] Aristotle Univ Thessaloniki, Dept Chem Engn, GR-54006 Thessaloniki, Greece
关键词
D O I
10.1002/aic.690490710
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This work reports the CO2 plasticization of gas-separation hollow-fiber membranes based on polyimide and polyethersulfone blends. The feed pressure effect on the permeance of pure gases (CO2, N-2) and the separation performance of a gaseous mixture (CO2/N-2, 55/45%) is examined. Contrary to dense membranes, the permeance of CO2 through ultrathin asymmetric fibers increases immediately with pressure resulting in pronounced apparent plasticization and reduction of the ideal CO2/N-2 selectivity. However, no evidence of plasticization was observed when a CO2/N-2, 55/45% mixture was fed to the hollow-fiber membranes. In all cases, CO2 permeance decreased with pressure, while that of N2 remained constant. Experimental results were validated by means of mathematical modeling. Membrane-separation performance was overestimated when pressure-independent permeabilities were used in the model, while pressure-dependent permeabilities, due to the overall effect of plasticization and competition phenomena, explained excellently, the obtained stage-cut and permeate purity.
引用
收藏
页码:1702 / 1711
页数:10
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