Patent ID: 9156749
Filing Date: 2015-10-13
Classification: B01J,C07C,Y02P

Abstract:
1. A process for the purification of an aromatic hydrocarbon stream including selective removal of styrene, comprising contact of said aromatic hydrocarbon process stream containing styrene and at least 70 wt % paraxylene, based on the total amount of C8 aromatic species in said process stream, with at least one material selected from MWW molecular sieves, clays, and mixtures thereof, to provide a product stream having lower concentration of styrene than said process stream, and wherein the selective removal of styrene causes less than 5 wt % of paraxylene to be lost to isomerization by said contact, wherein said contact comprises initially contacting said aromatic hydrocarbon process stream with said at least one material at a temperature of about 100° C. to about 180° C. to effectively remove styrene until paraxylene lost by isomerization is less than 5 wt % and subsequently raising said temperature to about 275° C. in a step-wise manner while maintaining paraxylene lost by isomerization to less than 5 wt %.