Patent ID: 9303227
Filing Date: 2016-04-05
CPC Classification: C10G,C10L

Claim Text:
1. A process for recovering liquefied petroleum gas from tail gas, the process comprising: (a) passing at least a portion of an effluent comprising hydrogen and hydrocarbon from a catalytic hydrocarbon conversion reaction zone to a first vapor-liquid separation zone and recovering from the first vapor-liquid separation zone a first hydrogen-rich gas stream and a first liquid stream comprising hydrocarbons; (b) admixing a portion of the first hydrogen-rich gas stream and at least a portion of the first liquid stream to produce a first admixture; (c) passing the first admixture to a second vapor-liquid separation zone to produce a second hydrogen-rich gas stream and a second liquid stream; (d) passing the second hydrogen-rich gas stream to a pressure swing adsorption zone containing an adsorbent selective for the separation of hydrogen from hydrocarbons and separating the second hydrogen-rich gas stream into a third hydrogen-rich stream and a tail gas stream; (e) admixing a portion of the tail gas stream and at least a portion of the second liquid stream to produce a second admixture; and (f) recovering liquefied petroleum gas from the second admixture.