Alkylation process unit with recyle of hydrogen and recovery of hydrogen chloride

Patent metadata

Field	Value
Publication number	US-9302200-B2
Application number	US-201313901935-A
Country	US
Kind code	B2
Filing date	May 24, 2013
Priority date	Jul 31, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

We provide alkylation process units, one comprising:
a) a hydrogenation reactor that produces a regenerated catalyst effluent; b) a fractionation unit that separates the effluent into gas and light hydrocarbon; c) a connection between the fractionation unit for transmitting the gas to the hydrogenation reactor; and d) a connection between the fractionation unit and an alkylation reactor to transmit the light hydrocarbon to the alkylation reactor. The other comprising: a) a separator, connected between the hydrogenation reactor and a fractionation unit; that separates the effluent into gas and liquid; and wherein the fractionation unit separates a hydrocarbon stream from the liquid into a light hydrocarbon comprising a hydrogen chloride and an extracted conjunct polymer naphtha; b) a connection between the separator and the hydrogenation reactor for transmitting the gas to the hydrogenation reactor; and c) a connection between the fractionation unit and an alkylation reactor to transmit the light hydrocarbon.

First claim

It is claimed:

1. An alkylation process unit, comprising:
a) a hydrogenation reactor ( 100 ), wherein a used catalyst ( 70 ) comprising an ionic liquid catalyst and a chloride produces a regenerated catalyst effluent ( 10 );
b) a fractionation unit ( 200 ) fluidly connected to the hydrogenation reactor ( 100 ), that separates at least a portion of the regenerated catalyst effluent ( 10 ) into a gas fraction comprising a hydrogen gas ( 20 ) and into a light hydrocarbon fraction comprising a hydrogen chloride ( 30 );
c) a first connection between the fractionation unit ( 200 ) and the hydrogenation reactor ( 100 ) for transmitting at least a part of the gas fraction to the hydrogenation reactor ( 100 ); and
d) a second connection between the fractionation unit ( 200 ) and an alkylation reactor ( 300 ) to transmit at least an amount of the light hydrocarbon fraction to the alkylation reactor ( 300 ).

2. The alkylation process unit of claim 1 , additionally comprising one or more separators between the hydrogenation reactor ( 100 ) and the fractionation unit ( 200 ), fluidly connected to the hydrogenation reactor ( 100 ) and the alkylation reactor ( 300 ); wherein the one or more separators produce an offgas ( 50 ) that is fed to the fractionation unit ( 200 ) and also produce an ionic liquid catalyst stream ( 60 ) that is fed to the alkylation reactor ( 300 ).

3. The alkylation process unit of claim 1 , additionally comprising a compressor located before the hydrogenation reactor ( 100 ), that compresses the at least the part of the gas fraction comprising the hydrogen gas ( 20 ) before recycling the at least the part of the gas fraction to the hydrogenation reactor ( 100 ).

4. The alkylation process unit of claim 1 , additionally comprising a third connection between a product treatment unit and the second connection wherein the light hydrocarbon fraction is mixed with a recycled stream from the product treatment unit comprising a mixture of a light hydrogen chloride and a propane.

5. The alkylation process unit of claim 1 , additionally comprising a selective olefin isomerization reactor ( 800 ), fluidly connected to the fractionation unit ( 200 ), that produces isomerized olefins ( 12 ) that are fed to the fractionation unit ( 200 ).

6. An alkylation process unit, comprising:
a) a hydrogenation reactor ( 100 ), wherein a used catalyst ( 70 ) comprising an ionic liquid catalyst and a chloride produces a regenerated catalyst effluent ( 10 );
b) a separator ( 400 ), fluidly connected to the hydrogenation reactor ( 100 ) and a fractionation unit ( 200 ); wherein the separator ( 400 ) separates the regenerated catalyst effluent ( 10 ) into a gas fraction comprising a hydrogen gas ( 20 ) and into a separated liquid ( 85 ); and wherein the fractionation unit ( 200 ) separates a hydrocarbon stream ( 52 ) from the separated liquid ( 85 ) into a light hydrocarbon fraction comprising a hydrogen chloride and an extracted conjunct polymer naphtha ( 45 );
c) a first connection between the separator and the hydrogenation reactor ( 100 ) for transmitting at least a part of the gas fraction to the hydrogenation reactor ( 100 ); and
d) a second connection between the fractionation unit ( 200 ) and an alkylation reactor ( 300 ) to transmit at least an amount of the light hydrocarbon fraction to the alkylation reactor ( 300 ).

7. The alkylation process unit of claim 6 , additionally comprising a compressor located before the hydrogenation reactor ( 100 ), that compresses the at least the part of the gas fraction comprising the hydrogen gas ( 20 ) before recycling the at least the part of the gas fraction to the hydrogenation reactor ( 100 ).

8. The alkylation process unit of claim 6 , additionally comprising a selective olefin isomerization reactor ( 800 ), fluidly connected to the fractionation unit ( 200 ), that produces isomerized olefins ( 12 ) that are fed to the fractionation unit ( 200 ).

Assignees

• Timken Hye Kyung Cho
• Chang Bong-Kyu
• Chevron Usa Inc

Inventors

• Timken Hye Kyung Cho
• Chang Bong-Kyu

Classifications

• C07C2/62

  with acids · CPC title

• Y02P20/584

  Recycling of catalysts · CPC title

• B01D3/009 Primary

  in combination with chemical reactions · CPC title

• B01J38/10

  using elemental hydrogen · CPC title

• C07C2/58 Primary

  Catalytic processes · CPC title