Split-feed two-stage parallel aromatization for maximum para-xylene yield
First Claim
1. A process for reforming a full boiling hydrocarbon feed to enhance para-xylene and benzene yields comprising:
- (a) separating the hydrocarbon feed into a C5- cut, a C6 -C7 cut, and a C8+ cut, wherein the C6 -C7 cut has less than 5 lv. % of C8+ hydrocarbon, and wherein the C8+ cut has less than 10 lv. % of C7- hydrocarbon;
(b) subjecting the C6 -C7 cut 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 non-acidic zeolite support to produce a first reformate stream containing less than 5 lv % C8 aromatics including xylenes; and
(c) subjecting the C8+ cut 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 containing C8 aromatics including xylenes;
wherein less than 20 wt. % of the total amount of C8 aromatics produced in the first and second reformer is ethylbenzene, and wherein more than 20 wt. % of the total amount of xylenes produced in the first and second reformer are para-xylenes.
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Accused Products
Abstract
A full boiling hydrocarbon feed is reformed to enhance para-xylene and benzene yields. First, the hydrocarbon feed is separated into a C5- cut, a C6 -C7 cut, and a C8+ cut. The C6 -C7 cut has less than 5 lv. % of C8+ hydrocarbon, and the C8+ cut has less than 10 lv. % of C7- hydrocarbon. The C6 -C7 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 C8+ 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 C8 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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Citations
5 Claims
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1. A process for reforming a full boiling hydrocarbon feed to enhance para-xylene and benzene yields comprising:
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(a) separating the hydrocarbon feed into a C5- cut, a C6 -C7 cut, and a C8+ cut, wherein the C6 -C7 cut has less than 5 lv. % of C8+ hydrocarbon, and wherein the C8+ cut has less than 10 lv. % of C7- hydrocarbon; (b) subjecting the C6 -C7 cut 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 non-acidic zeolite support to produce a first reformate stream containing less than 5 lv % C8 aromatics including xylenes; and (c) subjecting the C8+ cut 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 containing C8 aromatics including xylenes; wherein less than 20 wt. % of the total amount of C8 aromatics produced in the first and second reformer is ethylbenzene, and wherein more than 20 wt. % of the total amount of xylenes produced in the first and second reformer are para-xylenes. - View Dependent Claims (2, 3, 4, 5)
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Specification