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US 5,672,795 AGranted
Balanced alkylation feed from etherification and isomerization
AssigneeUop LLC
InventorsBipin V. Vora, Tamotsu Imai, Peter R. Pujado
Life of this patent
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Abstract
An etherification process combines an alkylation zone with a skeletal olefin isomerization zone in an arrangement that rejects isoalkanes and normal alkanes with only minor loss of valuable olefin isomers. The invention also provides a balanced feed to an alkylation zone for the production of high octane gasoline components. This invention can be used to provide ethers and gasoline boiling range alkylates from either C.sub.4 or C.sub.5 feedstocks. The invention fully utilizes all olefin isomers improve octane and vapor pressure charactristics of the gasoline components.
Claims22
A process for the production of ether and alkylate from a feedstream including C.sub.4 to C.sub.5 normal alkene, isoalkene, normal alkane and isoalkane isomers, said process consisting of:
- (a) mixing an etherification input stream comprising C.sub.4 to C.sub.5 isoalkenes, normal alkenes, isoalkanes, and normal alkanes with a C.sub.1 -C.sub.5 monohydroxy alcohol to produce a combined feed and contacting said combined feed with an etherification catalyst in an etherification zone at etherification conditions to react isoalkenes with said alcohol and produce an etherification effluent stream comprising ether and isoalkane, normal alkane, and normal alkene isomers;
- (b) passing a separation zone input stream comprising at least a portion of said etherification effluent stream and including normal alkane, normal alkene and isoalkane isomers to a first separation zone, distilling said separation input stream to separate ether from said separation zone input stream and withdrawing a high boiling first stream comprising said ether from said separation zone, and a second stream comprising said isoalkane, normal alkene and normal alkane isomers;
- (c) passing a first aliquot portion of said second stream equal to 10 to 50% of said second stream to an alkylation zone and contacting said first aliquot portion stream with an alkylation catalyst at alkylation conditions to produce an alkylate product stream comprising high octane motor fuel components;
- (d) passing a second aliquot portion of said second stream to an isomerization reaction zone for the skeletal isomerization of normal alkenes and contacting said second portion of said second stream with an isomerization catalyst at isomerization conditions;
- (e) withdrawing an isomerization zone effluent stream comprising isoalkenes from said isomerization zone and passing at least a portion of said isomerization zone effluent to said etherification reaction zone;
- and,
- (f) passing said feedstream including normal alkene, isoalkene, normal alkane and isoalkane isomers into at least one of said etherification zone, said separation zone and said isomerization zone.
4 more elements
A process for the production of tertiary amyl ether and high octane gasoline blending components from a feedstream including normal pentane, isopentane, normal pentene, and isopentene, said process consisting of:
- (a) mixing said feedstream and an isomerization zone effluent stream to produce a combined feed and contacting said combined feed with a selective hydrogenation catalyst at selective hydrogenation conditions in a selective hydrogenation zone to saturate diolefins to mono-olefins and produce a hydrogenated combined feed;
- (b) contacting said hydrogenated combined feed and a C.sub.1 -C.sub.5 monohydroxy alcohol with an etherification catalyst in an etherification zone at etherification conditions to react isopentenes with said alcohol and produce an etherification effluent stream comprising tertiary amyl ether, unreacted alcohol, normal pentene, normal pentene, and isopentane;
- (c) passing said etherification zone effluent stream to a separation zone, distilling said etherification zone effluent stream to separate ether from said etherification zone effluent stream and recovering a high boiling point first fraction comprising tertiary amyl ether and a second fraction comprising unreacted alcohol, isopentane, normal pentene and normal pentane;
- (d) passing said second fraction to an oxygenate removal zone to remove oxygenate compounds from said second fraction
- (e) passing an aliquot first portion of said second fraction equal to 10 to 50% of said second fraction from said oxygenate recovery zone to a an alkylation zone and contacting said first portion of said second fraction with an alkylation catalyst at alkylation conditions to produce an alkylate product stream comprising high octane motor fuel components;
- (f) passing an aliquot second portion of said second fraction from said oxygenate removal zone to an isomerization reaction zone for the skeletal isomerization of normal pentenes and contacting said second portion of said second fraction with an isomerization catalyst at isomerization conditions;
- and,
- (g) withdrawing an isomerization zone effluent stream comprising isopentenes from said isomerization zone and passing at least a portion of said isomerization zone effluent to said etherification reaction zone.
5 more elements
A process for the production of tertiary butyl ether from a feedstream including normal butene, isobutene, normal butane, and isobutane, said process consisting of:
- (a) mixing said feedstream and an isomerization effluent stream with a C.sub.1 -C.sub.5 monohydroxy alcohol to produce a combined feed and contacting said combined feed with an etherification catalyst in an etherification zone at etherification conditions to react isobutenes with said alcohol and produce an etherification effluent stream comprising tertiary butyl ether, unreacted alcohol, normal butane, normal butene, and isobutane;
- (b) passing said etherification zone effluent stream to a separation zone, distilling said etherification zone effluent stream to separate ether from said etherification zone effluent stream and recovering a high boiling first fraction comprising tertiary butyl ether and a second fraction comprising unreacted alcohol, isobutane, normal butane and normal butene;
- (c) passing said second fraction to an oxygenate removal zone to remove oxygenate compounds from said second fraction;
- (d) passing an aliquot first portion of said second fraction equal to 10 to 50% of said second fraction from said oxygenate removal zone to an alkylation zone and contacting said first portion of said second fraction with an alkylation catalyst at alkylation conditions to produce an alkylate product stream comprising high octane motor fuel components;
- (e) passing a second portion of said second fraction from said oxygenate removal zone to an isomerization reaction zone for the skeletal isomerization of normal butenes and contacting said second portion of said second fraction with an isomerization catalyst at isomerization conditions;
- and,
- (f) withdrawing an isomerization zone effluent stream comprising isobutenes from said isomerization zone and passing at least a portion of said isomerization zone effluent to said etherification reaction zone to provide at least a portion of said etherification reaction zone feedstream.
4 more elements
Dependencies are inferred from the claim text.