The pervaporation dehydration of isopropanol by Btda-Tdi/MDI (P84) co-polyimide membranes

Ruixue Liu, Xiangyi Qiao, Tai Shung Chung

Research output: Contribution to conferencePaperpeer-review


Previous polymeric pervaporation dehydration membranes were mainly focused on flat membranes. The study of integrally-skinned asymmetric hollow fibers for pervaporation was rarely reported. In this work, integrally skinned BTDA-TDI/MDI (P84) co-polyimide hollow fibers for pervaporation dehydration of isopropanol have been successfully developed, which have superior flux and selectivity towards water. The effects of spinning conditions such as air gap distance, coagulation temperature, and dope/bore fluid flow rates on membrane formation, morphology and pervaporation performance have been determined. It was found the silicone rubber coating can effectively seal the membrane defects, and remarkably improves the selectivity because of its nature of high water permeability. Annealing tremendously increased the separation factor / selectivity especially at 300°C, though densification of selective skin layer and reduction of free volume. The performance of newly developed P84 hollow fibers after heat treatment is superior to most previously reported hollow fibers.

Original languageEnglish (US)
Number of pages1
StatePublished - 2005
Externally publishedYes
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005


Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • General Engineering


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