B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/360
B01D 53/04 (2006.01)
Patent
CA 1121983
Abstract of the Disclosure An improved process and apparatus for recovering hydrocar- bons 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 and tank trucks. The air-hydrocarbon vapor mixture is caused to flow through a bed of solid adsorbent whereby the hydrocarbons are re- moved from the mixture and a residue gas stream comprised of sub- stantially hydrocarbon-free air is produced. The substantially hydrocarbon-free air is vented to the atmosphere and a second bed of solid adsorbent having hydrocarbons adsorbed thereon is sub- jected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed. The flow pattern of the in- let air-hydrocarbon vapor mixture and the bed of solid adsorbent being regenerated are periodically changed so that when the bed through which the inlet air-hydrocarbon mixture is flowing be- comes loaded with adsorbed hydrocarbons, the inlet air-hydrocar- bon mixture is caused to flow through the bed which has just been regenerated. The regeneration of the beds is accomplished by evacuating the beds with vacuum pumping whereby a major portion of the hydrocarbons are desorbed therefrom, subsequently intro- ducing a small quantity of heated hydrocarbon-free air into the beds whereby additional hydrocarbons are stripped therefrom and then subjecting the bed to further evacuation by ejector jet pumping while continuing to evacuate the bed by vacuum pumping whereby yet additional hydrocarbons are desorbed therefrom. The air-hydrocarbon vapor mixture produced in the regeneration of the beds is contacted with a liquid absorbent whereby a major portion of the hydrocarbons are absorbed therefrom and recovered. Appa- ratus for carrying out the process of the invention is also pro- vided.
355070
Dinsmore Harold L.
Long Gary W.
Peters Donald J.
Schwartz Robert E.
Ridout & Maybee Llp
Zink (john) Company
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