Recovery of volatile organic compounds from gas streams

Details Recovery of volatile organic compounds from gas streams Recovery of volatile organic compounds from gas streams

1996-03-19

1998-07-14

Spitzer, Robert

Gas separation: processes

Solid sorption

Including reduction of pressure

95105, 95106, 95115, 95141, 95142, B01D 53047

Patent

active

057797684

ABSTRACT:
A condensable component present at low concentration in a feed gas mixture containing the condensable component and a noncondensable component is recovered by selective adsorption from the feed gas mixture in an adsorption step, the resulting adsorbed condensable component is desorbed by a heated purge gas in a regeneration step to yield a purge gas effluent enriched in desorbed condensable component, and the purge gas effluent is cooled to condense and recover the condensable component as a liquid. An improvement comprises, during a time period of the regeneration step in which the concentration of the condensable component in the purge gas effluent reaches a maximum value, (a) dividing the purge gas effluent into a first and a second portion, (b) cooling the first portion of the purge gas effluent to a temperature sufficient to condense substantially all of the condensable component present therein and recovering the resulting condensate therefrom, and (c) cooling a second portion of the purge gas effluent and combining the resulting cooled gas stream with the feed gas mixture to yield a total feed mixture for the adsorption step.

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