Process for increasing the selectivity of anisotropic gas separa

Details Process for increasing the selectivity of anisotropic gas separa Process for increasing the selectivity of anisotropic gas separa

1986-05-09

1988-10-11

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2041576, 55 16, 55158, 264 22, 264 25, B01J 1908

Patent

active

047769360

ABSTRACT:
Anisotropic gas separation membranes are treated to alter the microporosity of their thin, dense layer or composite coating--the layer or coating which provides selectivity in separations employing such membranes. The treatment increases the selectivity of a membrane with minimal decrease in its flux. The process comprises applying a polar activator to the membrane followed by exposing the membrane to microwave frequency radiation for a period of time sufficient to compact the thin layer of the membrane. The polar activator may be incorporated in the membrane during fabrication or applied as an after-treatment.

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Cheng H. Lee, "Permeation Properties in Laminated Membranes", Separation Science, 9(6) pp. 479-485 1974.

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