Effect of support layer structure of composite membrane on the pervaporation performance
Date Issued
2010
Date
2010
Author(s)
Kao, Se-Tsung
Abstract
The main purpose of this dissertation is to study how to prepare skin-free support membranes and to interpret the mechanism of membrane formation by the nonsolvent-induced phase separation method, which involves the absorption of water vapor to induce phase separation, combined in-situ casting process with dual coagulation or precipitation method, and added inorganic particle. Also, the effects of skin-free support membranes on their pervaporation performance were discussed.
In the preparation of skin-free PC/PAN composite membranes, the membrane formation was via the vapor-induced phase separation (VIPS) method combined with in-situ casting process. This method proved effective in obtaining a porous top surface. Compared with the traditional method of preparing asymmetric PAN membrane with a dense skin layer and porous support layer, the VIPS method combined with the in-situ casting process effectively prevented skin layer formation in the ensuing PC/PAN composite membranes, resulting in the water flux increase. The mechanical properties of the PC/PAN composite membranes decreased with decreasing the PC casting layer concentration.
Dual coagulation bath was the precipitation method used in forming the skin-free PC/PAN composite membranes. The surface pore size and surface roughness increased with increase in the immersion time in the first coagulation bath (ethanol), resulting in the water flux increase. Chitosan/skin-free CA composite membranes were prepared for the separation of 70 wt% IPA/H2O at 70
Subjects
skin-free support membranes
composite membrane
vapor-induced phase separation (VIPS) method
dual coagulation method
in-situ casting process
organic/inorganic blend membrane
pervaporation
Type
thesis
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