Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-10-16
1991-09-03
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 68, 55158, B01D 5322, B01D 7164
Patent
active
050450930
ABSTRACT:
The present invention is a class of semi-permeable polyimide membranes and a process for using such membranes to separate one or more components of a gaseous mixture. The membranes are prepared from a polyimide having surface-modifiable functionalities comprising repeating units formed from an aromatic dianhydride and a bridged alkylated bisaniline wherein the bridging group of the diamine possesses restricted, rotatable rigid or low Van Der Waal energy substituents which are orthogonal to the polymer backbone. The membranes formed therefrom are contacted in the presence of an oxygen source with an activating force such as high energy electromagnetic irradiation to effect modification of the polymer surface. The surface-modified polyimide membranes exhibit high gas perm-selectivities and are especially useful in effecting the separation of oxygen and nitrogen from air.
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Langsam Michael
Meier Ingrid K.
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Simmons James C.
Spitzer Robert
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