Jacob S Yearout

US Patent:

48081990, Feb 28, 1989

Filed:

Mar 31, 1987

Appl. No.:

7/032826

Inventors:

Jacob S. Yearout - Houston TX

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

B01D 5322

US Classification:

55 16

Abstract:

An improved method for using a membrane to separate gases provides for relieving the pressure on the permeate side of the membrane when the permeate pressure exceeds the feed pressure by a selected amount. Gas separation apparatus in general and, in particular, spiral wound membrane units are improved by providing for relief of such reversed pressure differentials. A suitable device for relieving the reversed pressure differential includes a body, a poppet movably mounted to the body and biased to a closed position until the selected pressure differential is reached, and a seal for preventing gas flow through the device when the poppet is closed.