Ultrathin ethylcellulose/poly(4-methylpentene-1) permselective m

Details Ultrathin ethylcellulose/poly(4-methylpentene-1) permselective m Ultrathin ethylcellulose/poly(4-methylpentene-1) permselective m

1987-12-11

1989-10-03

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 55158, 264 48, B01D 5322

Patent

active

048713783

ABSTRACT:
An ultrathin, permselective membrane for use in gas or vapor separations. The membrane comprises a permselective layer of ethylcellulose in combination with one or more permselective layers of poly(4-methylpentene-1). The permselective membrane is preferably coated onto a microporous substrate, such as an asymmetric Loeb-Sourirajan type membrane. The resulting membrane has high gas fluxes and selectivities, and can be used, for example, to separate oxygen and nitrogen; hydrogen sulfide from nitrogen, methane or carbon dioxide; hydrogen from nitrogen; sulfur dioxide or ammonia from nitrogen; or water vapor from air. A method of preparing such a membrane is also provided, as is a gas separation process using the membrane.

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