B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
183/18
B01D 53/02 (2006.01) B01D 53/04 (2006.01) B01D 53/047 (2006.01)
Patent
CA 1132061
Abstract of the Disclosure An improved process and apparatus for recovering hydro- carbons 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 so that the hydrocarbons are removed from the mixture and a residue gas stream comprised of substantially hydrocarbon-free air is produced. The substan- tially hydrocarbon-free air is vented to the atmosphere and a second bed of solid absorbent having hydrocarbons adsorbed there- on is subjected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed. The flow pat- tern of the inlet 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 mix- ture is flowing becomes loaded with adsorbed hydrocarbons, the inlet air-hydrocarbon 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 so that a major portion of the hydrocarbons are desorbed there- from and subsequently introducing a small quantity of heated hydrocarbon-free air into the beds so that additional hydrocar- bons are stripped therefrom. The air-hydrocarbon vapor mixture produced in the regeneration of the beds is contacted with a heated first portion and a second portion of a liquid absorbent so that a major portion of the hydrocarbons are absorbed therefrom and recovered. The first portion is heated by passing it in heat exchange relationship with a seal liquid used in a vacuum pump which effects the vacuum pumping of the adsorbent beds. Apparatus for carrying out the process of the invention is also provided.
364914
Ridout & Maybee Llp
Zink (john) Company
LandOfFree
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