Processes and systems for the conversion of acyclic hydrocarbons

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.