Patent ID: 7071369
Filing Date: 2006-07-04
Classification: B01D,B01J,C07C,Y02P

Abstract:
1. A process for the production of alkylbenzene comprising the steps of: a) introducing benzene and an olefin feed into a first alkylation reaction zone in the presence of a first alkylation catalyst under first alkylation reaction conditions to produce a first alkylation effluent containing alkylbenzene and a first alkylation overhead stream; b) separating the first alkylation overhead stream into a liquid portion containing benzene and a vapor portion containing unconverted olefin and ethane; c) absorbing a major portion of the unconverted olefin in the vapor portion of the first alkylation overhead stream into a de-ethanized aromatic substantially olefin-free lean oil stream containing benzene and alkylbenzene in an absorption zone to produce a rich oil stream containing olefins and at least some of the ethane; d) introducing said rich oil stream into a second alkylation reaction zone containing a second alkylation catalyst under second alkylation reaction conditions to produce a first aromatic lean oil stream; and, e) fractionating the first aromatic lean oil stream in a de-ethanizer to produces a de-ethanizer vapor overhead containing a major portion of the ethane and a liquid bottoms stream containing the de-ethanized aromatic lean oil.