Process and apparatus for recovering hydrocarbons from air-hydro

Details Process and apparatus for recovering hydrocarbons from air-hydro Process and apparatus for recovering hydrocarbons from air-hydro

1981-02-05

1982-08-10

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 48, 55 58, 55 88, 55 89, 55180, 55208, 55387, B01D 5304, B01D 5314

Patent

active

043436293

ABSTRACT:
A process and apparatus for recovering hydrocarbons from an air-hydrocarbon vapor mixture such as the mixture of air and vaporized light hydrocarbon compounds expelled as a result of loading gasoline or the like into storage tanks, tank cars and tank trucks. The air-hydrocarbon vapor mixture is caused to flow through a bed of solid adsorbent whereby the hydrocarbons ar removed from the mixture and a residue gas stream comprised of substantially hydrocarbon-free air is produced. The substantialy hydrocarbon-free air is vented to the atmosphere and while the first bed is removing hydrocarbons from the air-hydrocarbon vapor mixture, a second bed of solid adsorbent having hydrocarbons adsorbed thereon is simultaneously regenerated by evacuating the bed with vacuum pumping and the air-hydrocarbon vapor mixture produced in the regeneration of the bed is contacted with a liquid absorbent whereby a major portion of the hydrocarbons are absorbed therefrom and recovered. The beds of solid adsorbent are cooled, at least while the air-hydrocarbon vapor mixture is flowing therethrough and hydrocarbons are being adsorbed on the bed, to prevent the beds from overheating due to side exothermic reactions of hydrocarbons and/or impurities contained in the air-hydrocarbon vapor mixture with air and/or the solid adsorbent. Apparatus for carrying out the process of the present invention is also provided.

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