Hollow fiber microporous membrane, and gas separation membrane module with same built thereinto
AssigneeToray Industries, Inc.
InventorsShingo Takechi, Hiroo Katsuta, Hidekazu Kano, Masaki Fujita
Life of this patent
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Abstract
A high-quality microporous hollow fiber membrane having high gas permeability, gas selectivity, and strength. A microporous hollow fiber membrane, having a carbon dioxide gas flux of 10×10−5 to 200×10−5 (cm3(STP)/cm2/sec/cmHg), a value (carbon dioxide gas flux/nitrogen gas flux) obtained by dividing a value of a carbon dioxide gas flux by a value of a nitrogen gas flux (cm3(STP)/cm2/sec/cmHg) of 1.3 or more, and a tensile strength of 0.5 cN/dtex or more.
Claims18
A microporous hollow fiber membrane, having
- a carbon dioxide gas flux of 10×10−5 to 200×10−5 (cm3(STP)/cm2/sec/cmHg),
- a value (carbon dioxide gas flux/nitrogen gas flux) obtained by dividing a value of a carbon dioxide gas flux (cm3(STP)/cm2/sec/cmHg) by a value of a nitrogen gas flux (cm3(STP)/cm2/sec/cmHg) of 1.3 or more, and
- and a tensile strength of 0.5 cN/dtex or more,
- a nitrogen gas flux of 8×10−5 to 160×10−5 (cm3(STP)/cm2/sec/cmHg).
A microporous hollow fiber membrane, having
- a carbon dioxide gas flux of 10×10−5 to 200×10−5 (cm3(STP)/cm2/sec/cmHg),
- a value (carbon dioxide gas flux/nitrogen gas flux) obtained by dividing a value of a carbon dioxide gas flux (cm3(STP)/cm2/sec/cmHg) by a value of a nitrogen gas flux (cm3(STP)/cm2/sec/cmHg) of 1.3 or more, and
- a tensile strength of 0.5 cN/dtex or more,
- wherein the microporous hollow fiber membrane comprises a slit-like pore on a wall surface of an inner space of a hollow fiber.
A microporous hollow fiber membrane, having
- a carbon dioxide gas flux of 10×10−5 to 200×10−5 (cm3(STP)/cm2/sec/cmHg),
- a value (carbon dioxide gas flux/nitrogen gas flux) obtained by dividing a value of a carbon dioxide gas flux (cm3(STP)/cm2/sec/cmHg) by a value of a nitrogen gas flux (cm3(STP)/cm2/sec/cmHg) of 1.3 or more, and
- a tensile strength of 0.5 cN/dtex or more,
- wherein the microporous hollow fiber membrane has, on its outermost surface, a skin layer composed of crystals in the form of fine-grained particles having a diameter of 10 nm or less, the skin layer having a thickness of 200 nm or more, the thickness being defined as the shortest distance from a laminated crystal lamella to the fiber surface.
A microporous hollow fiber membrane, having
- a carbon dioxide gas flux of 10×10−5 to 200×10−5 (cm3(STP)/cm2/sec/cmHg),
- a value (carbon dioxide gas flux/nitrogen gas flux) obtained by dividing a value of a carbon dioxide gas flux (cm3(STP)/cm2/sec/cmHg) by a value of a nitrogen gas flux (cm3(STP)/cm2/sec/cmHg) of 1.3 or more, and
- a tensile strength of 0.5 cN/dtex or more,
- wherein the microporous hollow fiber membrane is formed of a hydrophobic material having interconnected pores with an average interconnected pore radius of 0.005 μm or less.
Dependencies are inferred from the claim text.