B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
183/2
B01D 53/22 (2006.01) B01D 71/24 (2006.01)
Patent
CA 1256388
ABSTRACT OF THE DISCLOSURE 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 pres- sure 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.
482081
Membrane Technology And Research Inc.
Riches Mckenzie & Herbert Llp
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