Invention Grant
US6051128A Split-feed two-stage parallel aromatization for maximum para-xylene yield
失效
分离进料两阶段平行芳构化,以获得最大的对二甲苯产率
- Patent Title: Split-feed two-stage parallel aromatization for maximum para-xylene yield
- Patent Title (中): 分离进料两阶段平行芳构化,以获得最大的对二甲苯产率
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Application No.: US470845Application Date: 1995-06-06
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Publication No.: US6051128APublication Date: 2000-04-18
- Inventor: Gerald J. Nacamuli , Bruce J. Thom
- Applicant: Gerald J. Nacamuli , Bruce J. Thom
- Applicant Address: CA San Ramon
- Assignee: Chevron Chemical Company
- Current Assignee: Chevron Chemical Company
- Current Assignee Address: CA San Ramon
- Main IPC: C10G59/06
- IPC: C10G59/06 ; C10G51/06 ; C07C2/52 ; C07C15/00 ; C10G35/04
Abstract:
A full boiling hydrocarbon feed is reformed to enhance para-xylene and benzene yields. First, the hydrocarbon feed is separated into a C.sub.5- cut, a C.sub.6 -C.sub.7 cut, and a C.sub.8+ cut. The C.sub.6 -C.sub.7 cut has less than 5 lv. % of C.sub.8+ hydrocarbon, and the C.sub.8+ cut has less than 10 lv. % of C.sub.7- hydrocarbon. The C.sub.6 -C.sub.7 cut is subjected to catalytic aromatization at elevated temperatures in a first reformer in the presence of hydrogen and using a non-acidic catalyst comprising at least one Group VIII metal and a non-acidic zeolite support to produce a first reformate stream; and the C.sub.8+ cut is subjected to catalytic aromatization at elevated temperatures in a second reformer in the presence of hydrogen and using an acidic catalyst comprising at least one Group VIII metal and a metallic oxide support to produce a second reformate stream. Less than 20 wt. % of the total amount of C.sub.8 aromatics produced in the first and second reformer is ethylbenzene, and more than 20 wt. % of the total amount of xylenes produced in the first and second reformer are para-xylenes.
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