초록 ▼

The present invention relates to an asymmetric hollow fiber membrane for gas separation made of a soluble aromatic polyimide, wherein an orientation index is 1.3 or less, a separation coefficient α(P′O2/P′N2) as a permeation rate ratio of oxygen gas/nitrogen gas at 40° C. is 5.3 or more, and a tensi

The present invention relates to an asymmetric hollow fiber membrane for gas separation made of a soluble aromatic polyimide, wherein an orientation index is 1.3 or less, a separation coefficient α(P′O2/P′N2) as a permeation rate ratio of oxygen gas/nitrogen gas at 40° C. is 5.3 or more, and a tensile fracture elongation is 15% or more.

대표청구항 ▼

1. An asymmetric hollow fiber membrane for gas separation made of a soluble aromatic polyimide, wherein an orientation index is 1.3 or less,a separation coefficient α(P′O2/P′N2) which represents a ratio of permeation rate of oxygen gas and nitrogen gas at 40° C. is 5.3 or more, anda tensile elongati

1. An asymmetric hollow fiber membrane for gas separation made of a soluble aromatic polyimide, wherein an orientation index is 1.3 or less,a separation coefficient α(P′O2/P′N2) which represents a ratio of permeation rate of oxygen gas and nitrogen gas at 40° C. is 5.3 or more, anda tensile elongation at break is 15% or more. 2. The asymmetric hollow fiber membrane for gas separation according to claim 1, wherein an oxygen gas permeation rate P′O2 at 40° C. is 6.0×10−5 cm3 (STP)/cm2·sec·cmHg or more. 3. The asymmetric hollow fiber membrane for gas separation according to claim 1, wherein the soluble aromatic polyimide comprises a repeating unit represented by general formula (1): wherein in the general formula (1), 25 to 100 mol % of A is a tetravalent unit based on a biphenyl structure represented by formula (2): to 70 mol % of A is a tetravalent unit based on a diphenylhexafluoropropane structure represented by formula (3): and 0 to 30 mol % of A is a tetravalent unit based on a phenyl structure represented by formula (4): and in general formula (1), 30 to 70 mol % of R is a divalent unit based on a diphenylene sulfone structure represented by formula (5): wherein R1 and R2 in formula (5) are a hydrogen atom or a lower alkyl group, and30 to 70 mol % of R is a divalent unit based on a biphenyl structure represented by formula (6): wherein X in formula (6) is a chlorine or bromine atom and n is 1 to 3. 4. A process comprising selectively separating and collecting a particular gas from a mixed gas containing a plurality of gases with the asymmetric hollow fiber membrane for gas separation according to claim 1. 5. A process comprising producing an oxygen-rich air or nitrogen-rich air from the air with the asymmetric hollow fiber membrane for gas separation according to claim 1.