Aromatic polyimide gas-separating membrane

Details Aromatic polyimide gas-separating membrane Aromatic polyimide gas-separating membrane

1982-06-30

1984-10-02

Spear, Jr., Frank A.

Stock material or miscellaneous articles

Composite

Of polyimide

55158, 2105002, 521 61, B01D 5914

Patent

active

044748582

ABSTRACT:
An aromatic polyimide membrane having an excellent gas-separating property comprises (A) a substrate consisting of a porous membrane comprising at least one aromatic polyimide having at least 80 molar % of at least one type of recurring unit of the formula (I): ##STR1## wherein R is a tetravalent aromatic radical and R.sup.1 is a divalent aromatic radical, the porous membrane exhibiting a hydrogen gas permeability (PH.sub.2) of 1.times.10.sup.-5 to 5.times.10.sup.-1 cm.sup.3 /cm.sup.2.sec.cmHg and a ratio of hydrogen gas permeability (PH.sub.2) to carbon monoxide gas permeability (PCO) of 2 to 5; and (B) 50% or more, based on the weight of the porous membrane substrate, of a gas-separating liquid contained in the porous membrane substrate, the gas-separating liquid being substantially incapable of dissolving therein the porous membrane substrate and having a boiling point of 180.degree. C. or more.

REFERENCES:
patent: 3899309 (1975-08-01), Hoehn et al.
patent: 4113628 (1978-09-01), Alegranti
patent: 4230463 (1980-10-01), Henu et al.
patent: 4378400 (1983-03-01), Makino et al.

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