Patent ID: 9126883
Filing Date: 2015-09-08
Classification: C07C

Abstract:
1. A process for preparing linear alkylbenzenes by the alkylation of benzene with olefins having between about 8 and 20 carbon atoms comprising: contacting benzene and an effluent from a gas-to-liquid process comprising a mixture of about 12 to about 30 wt % olefins and about 70 to about 88 wt % paraffins in an alkylation zone under alkylation conditions including a catalytically effective amount of a catalyst comprising a first zeolite comprising UZM-8 and a second zeolite comprising a rare-earth substituted X or Y zeolite intermingled into single catalyst particles to provide an alkylation product containing monoalkylbenzenes, dialkylbenzenes, unreacted benzene, and unreacted paraffins; dividing the alkylation product into a first portion and a second portion; recycling the first portion of the alkylation product to the alkylation zone so that after the first portion of the alkylation product is mixed with the incoming feed, the ratio of olefins to the paraffins drops below 0.2; separating the second portion of the alkylation product into a benzene-rich fraction containing the unreacted benzene and a substantially benzene-free fraction containing alkylbenzenes, unreacted paraffins, and dialkylbenzenes; separating the substantially benzene-free fraction into a paraffin-rich fraction containing the unreacted paraffins and a substantially paraffin-free fraction containing the monoalkylbenzenes, and dialkylbenzenes; separating the substantially paraffin-free fraction into an monoalkylbenzene fraction containing the linear monoalkylbenzenes and a heavies fraction containing the dialkylbenzenes; and controlling a ratio of the first portion of the alkylation product to the second portion of the alkylation product to obtain a specified 2-phenyl content of the linear monoalkylbenzene product; wherein the drop in linearity between the olefin feed and product monoalkylbenzene is no more than about 10%.