Abstract: An improved process for recovering hydrocarbons from an inlet inert gas-hydrocarbon vapor mixture is provided. The inlet mixture is caused to flow through a first bed of solid adsorbent whereby hydrocarbon vapors are adsorbed on the bed and a residue gas stream comprised of substantially hydrocarbon-free inert gas is produced. The hydrocarbon-free inert gas is vented and a second bed of solid adsorbent having hydrocarbon vapors adsorbed thereon is evacuated with an ejector operated by a motive liquid. A major portion of the hydrocarbon vapors is desorbed from the bed and an inert gas and hydrocarbon-rich vapor mixture commingled with the motive liquid is produced. The inert gas and hydrocarbon-rich vapor mixture is separated from the motive liquid and conducted to a point of additional processing or disposal.

Abstract: An improved process for recovering hydrocarbons from an inlet inert gas-hydrocarbon vapor mixture is provided. The inlet mixture is caused to flow through a first bed of solid adsorbent whereby hydrocarbon vapors are adsorbed on the bed and a residue gas stream comprised of substantially hydrocarbon-free inert gas is produced. The hydrocarbon-free inert gas is vented and a second bed of solid adsorbent having hydrocarbon vapors adsorbed thereon is evacuated with an ejector operated by a motive liquid. A major portion of the hydrocarbon vapors is desorbed from the bed and an inert gas and hydrocarbon-rich vapor mixture commingled with the motive liquid is produced. The inert gas and hydrocarbon-rich vapor mixture is separated from the motive liquid and conducted to a point of additional processing or disposal.

Abstract: An improved process for recovering one or more condensable compounds from inert gas-condensable compound vapor mixture is provided. The inert gas-condensable compound vapor mixture is flowed through a first bed of solid adsorbent whereby the condensable compounds are removed from the mixture and a residue gas stream comprised of substantially condensable compound-free inert gas is produced and disposed of, e.g., vented to the atmosphere. A second bed of solid adsorbent is evacuated by vacuum pumping using a cooled liquid seal vacuum pump. As the resulting inert gas-condensable compound vapor mixture is contacted with the cooled seal liquid of the liquid seal vacuum pump, a major portion of the condensable compounds are condensed. The condensed compounds are recovered and a portion thereof are cooled and recycled as cooled seal liquid for the vacuum pump.

Abstract: An improved process 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, benzene 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 removed from the mixture and a residue gas stream comprised of substantially 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 subjected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed.

Abstract: 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.

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.

Abstract: An improved process 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 and tank trucks. The air-hydrocarbon vapor mixture is caused to flow through a bed of solid adsorbent whereby the hydrocarbons are removed from the mixture and a residue gas stream comprised of substantially 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 subjected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed.

Abstract: An improved 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 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 substantially hydrocarbon-free air is vented to the atmosphere and a second bed of solid adsorbent having hydrocarbons adsorbed thereon is subjected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed.

Abstract: An improved 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 and tank trucks. The air-hydrocarbon vapor mixture is caused to flow through a bed of solid adsorbent whereby the hydrocarbons are removed from the mixture and a residue gas stream comprised of substantially 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 subjected to conditions which cause desorption of the hydrocarbons and thereby regeneration of the bed.