Production method for p-xylene

Patent metadata

Field	Value
Publication number	US-11208367-B2
Application number	US-201917042536-A
Country	US
Kind code	B2
Filing date	Mar 19, 2019
Priority date	Mar 30, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A method for producing p-xylene, comprising: a dimerization step of bringing a first raw material comprising isobutene into contact with a dimerization catalyst to generate C8 components comprising diisobutylene; a cyclization step of bringing a second raw material comprising the C8 components into contact with a dehydrogenation catalyst comprising Pt in the presence of water to obtain a reaction product comprising p-xylene; and a collection step of collecting p-xylene from the reaction product.

First claim

The invention claimed is:

1. A method for producing p-xylene, comprising:
bringing a first raw material comprising isobutene into contact with a dimerization catalyst to generate C8 components comprising diisobutylene;
bringing a second raw material comprising the C8 components into contact with a dehydrogenation catalyst comprising Pt in the presence of water to obtain a reaction product comprising p-xylene, wherein the amount of water is from 0.1 equivalents to 10 equivalents based on the C8 components in the second raw material; and
collecting p-xylene from the reaction product.

2. The method according to claim 1 , wherein a C8 collected fraction comprising at least one selected from the group consisting of diisobutylene, 2,2,4-trimethylpentane, 2,5-dimethylhexane, 2,5-dimethylhexene and 2,5-dimethylhexadiene is further collected from the reaction product.

3. The method according to claim 2 , wherein the C8 collected fraction is recycled to the second raw material.

4. The method according to claim 1 , wherein a C4 collected fraction comprising at least one selected from the group consisting of isobutene and isobutane is further collected from the reaction product.

5. The method according to claim 4 , wherein the C4 collected fraction is recycled to the first raw material.

6. 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, ionic liquids, and ion-exchange resins.

7. The method according to claim 1 , wherein the dehydrogenation catalyst further comprises Sn.

Assignees

• Eneos Corp

Inventors

• Minoda Ai
• Akiyama Masanari
• Araki Yasuhiro

Classifications

• B01J21/04 Primary

  Alumina · CPC title

• C07C5/41 Primary

  Catalytic processes · CPC title

• C07C2531/10

  sulfonated · CPC title

• C07C2/28

  with ion-exchange resins · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title