Patent ID: 7517506

Claim:
A system for the production of alkylbenzene comprising: a) first alkylator means for alkylating benzene with an olefin, wherein the first alkylator means produces an effluent containing alkylbenzene and benzene, and an overhead stream; b) condensing means for separating the overhead stream from the first alkylator means into a vapor stream and a liquid stream; c) transalkylator means for contacting the liquid stream from the first alkylator means overhead with a stream containing polyalkylbenzene to produce a transalkylator effluent containing alkylbenzene and benzene; d) absorber means for contacting the vapor stream from the first alkylator means overhead with a de-ethanized lean oil stream containing benzene and alkylbenzene to produce a rich oil stream containing benzene, alkylbenzene and unconverted olefin; e) second alkylator means for converting the unconverted olefin and at least some of the benzene in the rich oil stream to produce a first lean oil stream; and, f) a fractionator for de-ethanizing the first lean oil stream to produce the de-ethanized lean oil stream.