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Apparatus for recovering hydrocarbons from an air-hydrocarbon vapor mixture of the type including a pair of alternatively used carbon bed adsorbers which are used to remove hydrocarbon vapors from the mixture and which are desorbed of hydrocarbons by subjecting the beds alternatively to vacuum regen

Apparatus for recovering hydrocarbons from an air-hydrocarbon vapor mixture of the type including a pair of alternatively used carbon bed adsorbers which are used to remove hydrocarbon vapors from the mixture and which are desorbed of hydrocarbons by subjecting the beds alternatively to vacuum regeneration using a vacuum pump the output of which is passed through an absorber using liquid gasoline as the absorbent liquid. The efficiency of the process is increased by interrupting the flow of the absorbent liquid during the initial period of the regeneration during which period the hydrocarbon vapor content of the mixture is low due to the fact that a substantial vacuum is required to separate the hydrocarbons from the carbon bed.

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In a process for recovering hydrocarbons from an air-hydrocarbon vapor mixture, the steps comprising: (a) passing an air-hydrocarbon vapor mixture through a first carbon bed which adsorbs the hydrocarbons, permitting substantially hydrocarbon free air to be vented to the atmosphere; (b) subjecting a

In a process for recovering hydrocarbons from an air-hydrocarbon vapor mixture, the steps comprising: (a) passing an air-hydrocarbon vapor mixture through a first carbon bed which adsorbs the hydrocarbons, permitting substantially hydrocarbon free air to be vented to the atmosphere; (b) subjecting a second carbon bed to a vacuum condition by means of a vacuum pump, to regenerate said second carbon bed by desorbing hydrocarbons which have previously been adsorbed thereby; (c) circulating the air-hydrocarbon vapor mixture exhausted from said second carbon bed to an absorber having means for providing an absorbent liquid through which said air-hydrocarbon vapor mixture is passed to absorb a portion of the hydrocarbon vapor; (d) returning the air-hydrocarbon vapor mixture from the output of said absorber to said first carbon bed; (e) periodically switching said first and second carbon beds whereby said second carbon bed receives said air-hydrocarbon vapor mixture and said first carbon bed is regenerated by desorbing hydrocarbons previously adsorbed therein; (f) circulating said absorbent liquid through said absorber during the cycles of alternately desorbing said first and second carbon beds; and (g) interrupting said circulation of absorbent periodically during the initial period of the desorption of each carbon bed until the level of hydrocarbon content in the air-hydrocarbon vapor exhausted from said each carbon bed is sufficiently high to be at least partially absorbed in said absorber. Apparatus for recovery of hydrocarbons from an air-hydrocarbon vapor mixture comprising means for regenerating a carbon bed used in the adsorption of hydrocarbons including an adsorber including a carbon bed, a vacuum pump connected to said adsorber to subject said carbon bed to a vacuum to desorb the hydrocarbons deposited therein, an absorber communicating with said vacuum pump, to receive an air-hydrocarbon vapor mixture, said absorber including a liquid pump to circulate an absorbent liquid therethrough so that said absorbent liquid is contacted by said air-hydrocarbon vapor mixture, control means for interrupting the flow of absorbent liquid periodically, said vacuum pump begins to exhaust said carbon bed until the hydrocarbon content of the air vapor mixture exhausted from said pump is equal to or greater than the hydrocarbon vapor content in the overhead gas of said absorber when liquid absorbent is flowing to said absorber.