Swelling behaviors and pervaporation properties of CA/PAN composite membranes for separation of caprolactam/water mixtures |
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Authors: | Lei Zhang Yunbai Luo Gaifeng Xue Ping Yu |
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Institution: | 1.Research and Development Center of Wuhan Iron and Steel (Group) Corp,Wuhan,Hubei, China;2.College of Chemistry and Molecular Sciences,Wuhan University,Wuhan,Hubei, China |
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Abstract: | The composite membranes with cellulose acetate (CA) as the separating layer material and polyacrylonitrile (PAN) as the supporting
layer material were prepared for separating caprolactam (CPL) from CPL/water mixtures by pervaporation technique. The swelling
experiments were carried out to investigate the effects of swelling time and CPL concentration on the degree of swelling.
The results showed that the CA membrane reached swelling equilibrium within 24 h, and the degree of swelling first slightly
decreased then increased with the increase of CPL concentration in the feed under the experimental conditions. Respectively
comparing flux with permeance, and separation factor with selectivity, we found out that the separation performance of the
CA/PAN composite membrane is more strongly dependent on its hydrophilic/hydrophobic nature as well as on the effects of operating
parameters, such as feed composition concentration and feed temperature. |
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Keywords: | |
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