Aromatic hydrocarbon purification method
AssigneeExxonMobil Chemical Patents Inc.
InventorsTimothy F. Kinn, Michael C. Clark
Life of this patent
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Abstract
In a process for reducing the amount of benzene produced in a startup procedure for purification of an aromatic feedstream, the improvement comprising a start-up procedure including contacting said catalyst with said feedstream at elevated LHSV for a period of time sufficient to reduce benzene and/or toluene levels to a predetermined level, and proceeding under normal operational conditions.
Claims11
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).
Dependencies are inferred from the claim text.