| 摘要 |
PROBLEM TO BE SOLVED: To provide an asymmetrical hollow fiber membrane for gas separation made of polyimide having a specific repetition unit that has its mechanical strength improved without affecting its separation performance badly, and a gas separation method for separating oxygen gas from a mixed gas containing oxygen gas and nitrogen gas by making the oxygen gas selectively permeate the asymmetrical hollow fiber membrane for gas separation. SOLUTION: The invention relates to an asymmetrical hollow fiber membrane for gas separation made of polyimide having a specific repetition unit, a gas separation method using the asymmetrical hollow fiber membrane for gas separation and a membrane module for gas separation, the asymmetrical hollow fiber membrane for gas separation having an improved tensile break elongation as hollow fiber membrane of 15% or more, a permeation rate (P'<SB>O2</SB>) of oxygen gas at 50°C of 4.0×10<SP>-5</SP>cm<SP>3</SP>(STP)/cm<SP>2</SP>*sec*cmHg or more and a ratio (P'<SB>O2</SB>/P'<SB>N2</SB>) of the permeation rate of oxygen gas to that of nitrogen gas of 4 or more. COPYRIGHT: (C)2008,JPO&INPIT |
