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Process for recovering organic vapors from air

Patent ·
OSTI ID:865672
A process for recovering and concentrating organic vapor from a feed stream of air having an organic vapor content of no more than 20,000 ppm by volume. A thin semipermeable membrane is provided which has a feed side and a permeate side, a selectivity for organic vapor over air of at least 50, as measured by the ratio of organic vapor permeability to nitrogen permeability, and a permeability of organic vapor of at least 3 x 10-7 cm3 (STP) cm/cm2 sec.cm Hg. The feed stream is passed across the feed side of the thin semipermeable membrane while providing a pressure on the permeate side which is lower than the feed side by creating a partial vacuum on the permeate side so that organic vapor passes preferentially through the membrane to form an organic vapor depleted air stream on the feed side and an organic vapor enriched stream on the permeate side. The organic vapor which has passed through the membrane is compressed and condensed to recover the vapor as a liquid.
Research Organization:
Membrane Technology and Research, Inc., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC07-83ID12379
Assignee:
Membrane Technology and Research, Inc. (Menlo Park, CA)
Patent Number(s):
4,553,983
Application Number:
06/636,474
OSTI ID:
865672
Country of Publication:
United States
Language:
English

References (6)

Thin-Film Composite Membrane Performance in a Spiral-Wound Single-Stage Reverse Osmosis Seawater Pilot Plant book January 1974
Trennung von Molekularen Mischungen mit Hilfe Synthetischer Membranen book January 1979
The formation mechanism of asymmetric membranes journal April 1975
Ultrathin silicone/polycarbonate membranes for gas separation processes journal January 1976
Separation of Aromatics and Naphthenes by Permeation through Modified Vinylidene Fluoride Films journal July 1973
Separation by Permeation Through Polymeric Membranes book May 2018

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