Patent ID: 7199068
Filing Date: 2007-04-03
Classification: B01D,B01J,C07C,Y02P

Abstract:
1. A process for the regeneration of a solid acid alkylation catalyst in a reactive distillation alkylation process taking place in a pressurized distillation column including an intermediate reactive catalyst zone having supported therein a solid acid alkylation catalyst, a first rectification zone at the top of the distillation column and a second rectification zone including a reboiler below said reactive catalyst zone, wherein at least a portion of an olefin-containing feedstock is brought into contact with at least a portion of an aromatic hydrocarbon feedstock in counter-current flow within the reactive catalyst zone, wherein the internal pressure in the reactive catalyst zone is maintained above 1 atmosphere and the temperature maintained at reflux of said aromatic hydrocarbon feedstock comprising: A. periodically ceasing the introduction into the distillation column of the olefin-containing feedstock while continuing the flow of aromatic hydrocarbon feedstock and introducing into the column an effective amount of a paraffin feedstock at a point such that the paraffin feedstock intermixes in counter-current flow with the refluxing unreacted aromatic hydrocarbon feedstock as it flows through the catalyst to remove by-products from the catalyst; B. adjusting the reflux rate of said aromatic hydrocarbon to achieve a desired temperature in the catalyst reaction zone above about 175° C. at a column operating pressure within the range of from about 125 to about 370 psig. C. separating said by-products from said paraffin and aromatic hydrocarbon in said second rectification zone; and D. removing said by-products from said rectification zone.