Patent ID: 8227654

Claim:
In a process for treating an aromatic hydrocarbon feedstream to reduce the amount of olefinic components in said feedstream, said process comprising contacting said feedstream with a catalyst comprising zeolite and optionally clay and including: (i) a start-up procedure wherein the amount of at least one of benzene and toluene from said contacting is above an acceptable predetermined level; and (ii) an operational procedure, including conditions of a predetermined LHSV and temperature of said feedstream, wherein the amount of at least one of benzene and toluene from said contacting is at or below an acceptable predetermined level; the improvement comprising said start-up procedure including an LHSV that is at least twice the predetermined LHSV in said operational procedure in (ii) and at a temperature lower than the predetermined temperature in (ii) for a period of time sufficient to reduce benzene and/or toluene levels to said predetermined level in (ii).