Method for producing p-xylene

Patent metadata

Field	Value
Publication number	US-11066343-B2
Application number	US-201716349394-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	Nov 16, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

Provided is a method for producing p-xylene, comprising: a provision step of providing a C4 fraction comprising at least isobutene as a product formed by fluidized catalytic cracking of a heavy oil fraction; a dimerization step of bringing a first raw material comprising the isobutene into contact with a dimerization catalyst to produce a C8 component comprising a dimer of isobutene; and a cyclization step of bringing a second raw material comprising the C8 component with a dehydrogenation catalyst to produce p-xylene through a cyclization/dehydrogenation reaction of the C8 component.

First claim

The invention claimed is:

1. A method for producing p-xylene, comprising:
providing a C4 fraction comprising at least isobutene as a product formed by fluidized catalytic cracking of a heavy oil fraction;
bringing a first raw material comprising the isobutene into contact with a dimerization catalyst to produce a C8 component comprising a dimer of the isobutene; and
bringing a second raw material comprising the C8 component into contact with a dehydrogenation catalyst to produce p-xylene through a cyclization/dehydrogenation reaction of the C8 component, wherein
the dehydrogenation catalyst comprises supported metals comprising
at least one metal element in group 14 and
Pt

supported on a support comprising
Al and
at least one metal element in group 2, and

the molar ratio of the at least one metal element in group 14 to Pt (number of moles of at least one metal element in group 14/number of moles of Pt) in the dehydrogenation catalyst is from 5.4 to 15, and
the content of the at least one metal element in group 14 in the dehydrogenation catalyst is 4 mass % or more based on the total mass of the dehydrogenation catalyst.

2. The method according to claim 1 , wherein the C4 fraction further comprises isobutane, normal butene and normal butane.

3. The method according to claim 2 , further comprising
obtaining a fraction (A) comprising the isobutene and the isobutane and a fraction (B) comprising the normal butene and the normal butane from the C4 fraction.

4. The method according to claim 3 , wherein the first raw material comprises the fraction (A).

5. The method according to claim 3 , further comprising
obtaining a fraction comprising isobutene (A-1) and a fraction comprising isobutane (A-2) from the fraction (A).

6. The method according to claim 5 , wherein the first raw material comprises the fraction (A-1).

7. The method according to claim 3 , further comprising
bringing a third raw material comprising the fraction (B) into contact with a dehydrogenation catalyst to produce butadiene.

8. The method according to claim 3 , further comprising
bringing a third raw material comprising the fraction (B) into contact with an isomerization catalyst to produce isobutene and isobutane.

9. The method according to claim 8 , wherein the produced isobutene is used as a part of the first raw material.

10. The method according to claim 1 , wherein the dimerization catalyst comprises at least one acidic catalyst selected from the group consisting of sulfuric acid, zeolite, solid phosphoric acid, hydrofluoric acid, an ionic liquid, and an ion exchange resin.

11. The method according to claim 1 , wherein the dehydrogenation catalyst comprises an inorganic oxide support comprising Al and Mg, and an active metal supported on the inorganic oxide support.

12. The method according to claim 11 , wherein the active metal comprises Pt and Sn.

Assignees

• Eneos Corp

Inventors

• Araki Yasuhiro
• Yokoi Mayumi
• Ida Ryoji
• Segawa Atsushi
• Akiyama Masanari

Classifications

• C07C2523/62

  with gallium, indium, thallium, germanium, tin or lead · CPC title

• C07C5/415

  with metals · CPC title

• C07C2/28

  with ion-exchange resins · CPC title

• C07C2521/12

  Silica and alumina · CPC title

• B01J23/62

  with gallium, indium, thallium, germanium, tin or lead · CPC title