Processes and systems for the conversion of acyclic hydrocarbons

Patent metadata

Field	Value
Publication number	US-10364200-B2
Application number	US-201815892832-A
Country	US
Kind code	B2
Filing date	Feb 9, 2018
Priority date	May 3, 2017
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

This invention relates to processes and systems for converting acyclic hydrocarbons to alkenes, cyclic hydrocarbons and/or aromatics, for example converting acyclic C5 hydrocarbons to cyclopentadiene in a reactor system. The process includes contacting a feedstock comprising acyclic hydrocarbons with a catalyst material in at least one reaction zone to convert at least a portion of the acyclic hydrocarbons to a first effluent comprising alkenes, cyclic hydrocarbons and/or aromatics. A co-feed comprising H2, C1-C4 alkanes and/or C1-C4 alkenes may also be provided to the at least one reaction zone.

First claim

What is claimed is:

1. A process for converting acyclic C 5 hydrocarbons to cyclic C 5 alkenes in a reactor system, wherein the process comprises:
contacting an acyclic C 5 feedstock and optionally H 2 with a catalyst material comprising a Group 10 metal on any one or more of ZSM-5, zeolite L, and/or silica in at least one reaction zone under reaction conditions to convert at least a portion of the acyclic C 5 feedstock to a first effluent comprising cyclic C 5 alkenes, wherein the feedstock enters the at least one reaction zone at a temperature of about 300° C. to about 700° C.; and
providing a co-feed comprising H 2 , C 1 -C 4 alkanes and/or C 1 -C 4 alkenes at a temperature of about 600° C. to about 1100° C. to heat the at least one reaction zone, wherein the feedstock and the co-feed are provided to the at least one reaction zone at different locations via different inlets, and wherein the feedstock is heated to a lower temperature than the co-feed.

2. The process of claim 1 , wherein the at least one reaction zone is a captive or circulating fluidized bed reactor.

3. The process of claim 1 , wherein the first effluent exiting the at least one reaction zone has a temperature of at least about 550° C.

4. The process of claim 1 , wherein the reaction conditions comprise a temperature of about 500° C. to about 700° C. and a pressure of about 3 psia to about 100 psia.

5. The process of claim 1 , wherein the catalyst material further comprises a binder comprising one or more of silica, titania, zirconia, metal silicates of Group 1 or Group 13 of the Periodic Table, carbides, nitrides, aluminum phosphate, aluminum molybdate, aluminate, surface passivated alumina, and mixtures thereof.

6. The process of claim 1 , wherein the feedstock is provided to the at least one reaction zone at a position above where the co-feed is provided.

7. The process of claim 1 , further comprising separating catalyst material from the first effluent to produce a separated catalyst material and introducing the separated catalyst material into the at least one reaction zone.

8. The process of claim 1 , further comprising transferring at least a portion of the catalyst material to a rejuvenation zone and/or a regeneration zone to produce a rejuvenated catalyst material and/or a regenerated catalyst material; and returning the rejuvenated catalyst material and/or the regenerated catalyst material to the at least one reaction zone.

9. The process of claim 7 , further comprising transferring at least a portion of the separated catalyst material to a rejuvenation zone and/or a regeneration zone to produce a rejuvenated catalyst material and/or a regenerated catalyst material; and returning the rejuvenated catalyst material and/or the regenerated catalyst material to the at least one reaction zone.

10. The process of claim 1 , further comprising providing fresh catalyst material to the at least one reaction zone.

11. The process of claim 1 , further comprising providing heat to the at least one reaction zone via at least one means for heating.

12. The process of claim 1 , further comprising separating at least a portion of the co-feed from the first effluent and recycling it back to the at least one reaction zone.

13. The process of claim 1 , wherein the co-feed comprises ethane, methane and/or a mixture of ethane and ethylene.

14. The process of claim 1 , wherein the acyclic C 5 feedstock comprises pentane, pentene, pentadiene or mixtures of two or more thereof, and the cyclic C 5 alkenes comprise cyclopentadiene.

15. The process of claim 14 , wherein at least about 30 wt % of the acyclic C 5 feedstock is converted to cyclopentadiene.

16. The process of claim 14 , wherein the co-feed provides at least about 25% of required heat for converting at least a portion of the acyclic C 5 feedstock to the first effluent comprising cyclopentadiene.

17. The process of claim 1 , wherein the acyclic C 5 feedstock consists essentially of pentane, pentene, pentadiene or mixtures of two or more thereof.

18. The process of claim 1 , wherein the Group 10 metal is platinum.

19. The process of claim 1 , wherein the at least one reaction zone is a fluidized bed.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Sangar Neeraj
• Iaccino Larry L
• Becker Christopher L

Classifications

• B01J2208/00991

  Disengagement zone in fluidised-bed reactors · CPC title

• B01J2208/00752

  Feeding · CPC title

• C07C13/15

  with a cyclopentadiene ring · CPC title

• B01J8/24

  according to "fluidised-bed" technique (B01J8/20 takes precedence) · CPC title

• C07C2529/44

  Noble metals · CPC title