Normal heptane isomerization
First Claim
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1. A process for the isomerization of normal heptane contained within a hydrocarbon stream comprising the steps of:
- (a) concurrently;
(i) contacting normal heptane contained in a hydrocarbon feed containing normal heptane and heavier material with an isomerization catalyst under conditions of temperature and pressure to isomerize normal heptane to branched heptane and (ii) separating the branched heptane from the normal heptane and heavier material by fractional distillation; and
(b) withdrawing the branched heptane and the heavier material separately.
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Abstract
A process for the isomerization of heptane preferably contained within a naphtha stream is disclosed wherein the naphtha is stripped of the butanes and the pentanes and hexanes are removed for isomerization. The heptanes and heavier are fed to a distillation column reactor containing an isomerization catalyst where the normal heptane is isomerized to mono and di branched heptane and removed as overheads. The cyclic heptanes and heavier are removed as bottoms and for feed to a catalytic reforming process.
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Citations
21 Claims
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1. A process for the isomerization of normal heptane contained within a hydrocarbon stream comprising the steps of:
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(a) concurrently;
(i) contacting normal heptane contained in a hydrocarbon feed containing normal heptane and heavier material with an isomerization catalyst under conditions of temperature and pressure to isomerize normal heptane to branched heptane and (ii) separating the branched heptane from the normal heptane and heavier material by fractional distillation; and
(b) withdrawing the branched heptane and the heavier material separately. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A process for the isomerization of normal heptane contained within a naphtha stream comprising the steps of:
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(a) feeding a naphtha stream containing normal heptane and heavier material to a distillation column reactor containing a bed of isomerization catalyst;
(b) concurrently in said distillation column reactor, (i) isomerizing a portion of the normal heptane to branched heptane and (ii) separating the branched heptane from the normal heptane and heavier material by fractional distillation;
(c) withdrawing branched heptane as overhead product; and
(d) withdrawing the heavier material from the distillation column reactor as bottoms. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A process for the isomerization of heptanes contained in a naphtha stream comprising the steps of:
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(a) feeding naphtha stream containing C4'"'"'s, C5'"'"'s, C6'"'"'s, C7'"'"'s and C8'"'"'s and heavier compounds to a debutanizer wherein the C4'"'"'s and lighter material are taken as a first overhead and the C5'"'"'s and heavier are taken as a first bottoms;
(b) feeding the first bottoms to a naphtha splitter wherein the C5'"'"'s and C6'"'"'s are taken as a second overhead and the C7'"'"'s and heavier material are taken as a second bottoms;
(c) feeding the second overheads to a C5/C6 isomerization reactor where the normal C5'"'"'s and C6'"'"'s are isomerized to branched C5'"'"'s and C6'"'"'s;
(d) feeding the second bottoms to a distillation column reactor containing a bed of isomerization catalyst;
(e) concurrently in the distillation column reactor, (i) isomerizing a portion of the normal C7'"'"'s to mono branched C7'"'"'s and a portion of the mono branched C7'"'"'s to di branched C7'"'"'s, while maintaining the normal C7'"'"'s within the catalyst bed and (ii) separating the branched C7'"'"'s from the C8'"'"'s and any cyclic C7'"'"'s;
(f) withdrawing the branched C7'"'"'s from the distillation column reactor as a third overheads;
(g) withdrawing the C8'"'"'s and cyclic C7'"'"'s from the distillation column reactor as a third bottoms; and
(h) feeding the third bottoms to a catalytic reforming reactor to increase the octane.
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21. A process for the isomerization of alkanes contained within hydrocarbon stream comprising the steps of:
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(a) concurrently;
(i) contacting an alkane having a first skeletal configuration and contained in a hydrocarbon feed with an isomerization catalyst under conditions of temperature and pressure to isomerize the alkane of said first skeletal configuration to a second more highly branched skeletal configuration and (ii) separating the second more highly branched alkane from the alkane having said first configuration by fractional distillation; and
(b) withdrawing the second more highly branched alkane.
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Specification