Processes for increasing the overall aromatics and xylenes yield in an aromatics complex

Patent metadata

Field	Value
Publication number	US-10214465-B2
Application number	US-201815994945-A
Country	US
Kind code	B2
Filing date	May 31, 2018
Priority date	Dec 16, 2015
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

The present subject matter describes processes for increasing overall aromatics and xylenes yield in an aromatics complex. More specifically, the process for increasing overall aromatics and xylenes yield in an aromatics complex accomplishes the increased yields by incorporating an A8-A10 isomerization step into the aromatics complex. This isomerization integration increases the para-xylene.

First claim

The invention claimed is:

1. A process for increasing overall xylenes yield in an aromatics complex, the process comprising the steps of:
separating an aromatics-rich reformate into a first hydrocarbon stream comprising C 7 − hydrocarbons, a second hydrocarbon stream comprising C 8 -C 10 aromatics, and a third hydrocarbon stream comprising C 10 + aromatics;
isomerizing the second hydrocarbon stream comprising C 8 -C 10 aromatics to produce a C 8 -C 10 isomerization product stream;
passing the C 8 -C 10 isomerization product stream to a napthene dehydrogenation zone to produce a napthene dehydrogenation zone product stream;
separating the napthene dehydrogenation zone product stream into a first napthene dehydrogenation zone product stream comprising C 7 − hydrocarbons and a second naphthene dehydrogenation zone product stream comprising C 8 + aromatics; and
passing the second napthene dehydrogenation zone product stream comprising C 8 + aromatics to a xylenes recovery section or transalkylation zone.

2. The process of claim 1 , wherein the step of isomerizing comprises using an isomerization catalyst comprising a 12-member ring zeolite or 10-member ring zeolite, a binder, and a platinum-group metal component.

3. The process of claim 1 , wherein the step of isomerizing comprises a temperature range of about 250° C. to about 450° C.

4. The process of claim 1 , wherein the step of isomerizing comprises a pressure range of about 3 bar to about 15 bar.

5. The process of claim 1 , wherein the napthene dehydrogenation zone comprises a temperature range of about 250° C. to about 550° C.

6. The process of claim 1 , wherein the napthene dehydrogenation zone a pressure range of about 3 bar to about 15 bar.

7. The process of claim 1 , wherein separating the second hydrocarbon stream comprising C 8 -C 10 aromatics and the third hydrocarbon stream comprising C 10 + aromatics may be enabled by an internal dividing wall.

8. The process of claim 1 wherein the second hydrocarbon stream comprising Cm aromatic compounds are rich in butyl and methylpropylene benzenes relative to the third hydrocarbon stream.

9. A process for increasing overall xylenes yield in an aromatics complex, the process comprising the steps of:
separating an aromatics-rich reformate stream into a first hydrocarbon stream comprising C 7 − hydrocarbons, a second hydrocarbon stream comprising C 8 -C 10 aromatics, and a third hydrocarbon stream comprising C 10 + aromatics;
isomerizing the second hydrocarbon stream comprising C 8 -C 10 aromatics in a isomerization zone to produce a C 8 -C 10 isomerization product stream;
separating the C 8 -C 10 isomerization product stream into a first isomerization product stream comprising C 7 − hydrocarbons and a second isomerization product stream comprising C 8 + aromatics fraction;
passing the second isomerization product stream comprising C 8 + aromatics to an aromatics extraction zone to produce a first aromatics extraction zone product stream comprising C 8 + non-aromatics and a second aromatics extraction zone product stream comprising C 8 + aromatics;
passing the first aromatics extraction zone product stream comprising C 8 + non-aromatics back to the isomerization zone; and
passing the second aromatics extraction zone product stream comprising C 8 + aromatics fraction to a xylenes recovery section.

10. The process of claim 9 , wherein the step of isomerizing comprises using an isomerization catalyst comprising a 12-member ring zeolite or 10-member ring zeolite, a binder, and a platinum-group metal component.

11. The process of claim 9 , wherein the step of isomerizing comprises a temperature range of about 250° C. to about 450° C.

12. The process of claim 9 , wherein the step of isomerizing comprises a pressure range of about 3 bar to about 15 bar.

13. The process of claim 9 , wherein the aromatics extraction zone comprises a temperature range of about 250° C. to about 550° C.

14. The process of claim 9 , wherein the aromatics extraction zone a pressure range of about 3 bar to about 15 bar.

15. The process of claim 9 , wherein separating the second hydrocarbon stream comprising C 8 -C 10 aromatics and the third hydrocarbon stream comprising C 10 + aromatics may be enabled by an internal dividing wall.

16. The process of claim 9 wherein the second hydrocarbon stream comprising Cm aromatic compounds are rich in butyl and methylpropylene benzenes relative to the third hydrocarbon stream.

Assignees

• Uop Llc

Inventors

• Frey Stanley J
• Whitchurch Patrick C
• Couch Keith A

Classifications

• C07C15/08

  Xylenes · CPC title

• C10G69/123

  alkylation · CPC title

• C07C5/2767

  Changing the number of side-chains · CPC title

• C07C6/126 Primary

  of more than one hydrocarbon · CPC title

• C07C5/367

  Formation of an aromatic six-membered ring from an existing six-membered ring, e.g. dehydrogenation of ethylcyclohexane to ethylbenzene · CPC title