Abstract
UBE's process is based on the dehydration in vapor phase. Use of BPDA-polyimide makes it possible to produce a membrane with characteristics that include good water vapor permeation and excellent durability. The ethanol dehydration process has been used in UBE's chemical plant since 1990, resulting in reduced operating cost and improved operational stability. The IPA refinery system has been used in the LSI plant since 1993 and it also has produced good operating result.
