Air dehydration membrane

Details Air dehydration membrane Air dehydration membrane

2007-11-13

2007-11-13

Griffin, Walter D. (Department: 1709)

Gas separation: apparatus

Apparatus for selective diffusion of gases

C096S008000, C055S423000, C055S423000, C055S423000, C210S490000, C210S500230

Reexamination Certificate

active

11185049

ABSTRACT:
An air dehydration membrane is made of a hydrophilic polymer having a permeability for water vapor which is greater than its permeability for air, and having low selectivity between oxygen and nitrogen. The membrane has a hydrophilic coating, which itself may be a polymer. The coating does not affect the selectivity of the coated membrane with respect to oxygen and nitrogen, but does increase selectivity of the membrane with respect to water vapor. A preferred material for the membrane is polysulfone. Preferred materials for the coating are poly vinyl alcohol and Triton X-100. The membrane is selected such that the dominant mechanism for gas flow through the membrane is Knudsen flow. The membranes are made at low cost, and can outperform existing commercial membranes in either volumetric productivity or product recovery.

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