Patent ID: 8216450

Claim:
In a method for removing bromine-reactive contaminants from an aromatic hydrocarbon feedstream having less than 1000 ppm dienes and less than 10,000 ppm total olefins, comprising contacting a catalyst selected from the MCM-22 family of molecular sieves with said feedstream for a period of time defined as a contact cycle time, wherein the improvement comprises conditions including heating said feedstream to a temperature in the range of at least 210° C. at the start of the contact cycle time to a temperature in the range of about 240 to about 300° C. at the end of said contact cycle time, and a WHSV of greater than 5 and less than 30, whereby said contaminants are removed at a rate of at least 1000 kg of olefins per kg of catalyst to produce a substantially olefin-free aromatics stream during said cycle time.