Method for selective hydrogenation of unsaturated compound

Patent metadata

Field	Value
Publication number	US-9611435-B2
Application number	US-201214432150-A
Country	US
Kind code	B2
Filing date	Nov 8, 2012
Priority date	Dec 6, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

The present invention relates to a method for the selective hydrogenation of an unsaturated compound, particularly a method in an unsaturated compound or a mixture containing unsaturated compounds for increase of the light sulphides weight, hydrogenation of a polyunsaturated compound and isomerization of a monounsaturated compound. The method uses a supported catalyst. The supported catalyst contains at least one Group VIB non-noble metal oxide and at least one Group VIII non-noble metal oxide deposited on a carrier; and the catalyst has an optimized acid distribution on the surface of the catalyst, and more preferably has an optimized Group VIII/VIB metal ratio and a Group VIII non-noble metal density per unit of catalyst surface area.

First claim

What is claimed is:

1. A method for selective hydrogenation of an unsaturated compound, comprising increasing, by weight, an amount of light sulphides present in the unsaturated compound, and isomerizing a monounsaturated compounds during selective hydrogenation of the unsaturated compound,
wherein the selective hydrogenation is carried out in the presence of a catalyst having at least one Group VIB metal component and at least one Group VIII non-noble metal component supported on a carrier, wherein:
the Group VIB metal component comprises a Group VIB metal oxide in an amount of from 4% to 10% by weight of the catalyst;
the Group VIII metal component comprises a Group VIII non-noble metal oxide in an amount of from κ% to 15% by weight of the catalyst;
the catalyst comprises a B total /L total ratio of B acid to L acid in a surface acidity center of not more than 0.4; and a L weak /L strong ratio of weak L acid to strong L acid in the surface acidity center of 0.5 to 2.0; and
the carrier is substantially alumina.

2. The method according to claim 1 , wherein
the Group VIII non-noble metal oxide and the Group VIB metal oxide is are in a molar ratio of from greater than 3.0 mole/mole to 5.0 mole/mole; and
the Group VIII metal oxide per unit surface area of the catalyst is not less than 8×10 −4 g/m 2 .

3. The method according to claim 2 , wherein the molar ratio of the Group VIII non-noble metal oxide to the Group VIB metal oxide in the catalyst is from 3.2 mole/mole to 5.0 mole/mole.

4. The method according to claim 1 , wherein the Group VIB metal component comprises molybdenum, tungsten, or a combination thereof.

5. The method according to claim 1 , wherein the Group VIII non-noble metal component comprises nickel, cobalt, or a combination thereof.

6. The method according to claim 1 , wherein the Group VIB metal oxide is in an amount of from 6% to 8% by weight of the catalyst.

7. The method according to claim 1 , wherein the Group VIII non-noble metal oxide is in an amount of from 8% to 12% by weight of the catalyst.

8. The method according to claim 1 , wherein the Group VIII metal oxide per unit surface area of the catalyst is not less than 10×10 −4 g/m 2 .

9. The method according to claim 1 , wherein the ratio B total /L total of B acid to L acid in the surface acidity center of the catalyst is from 0.05 to 0.3.

10. The method according to claim 1 , wherein the ratio L weak /L strong of weak L acid to strong L acid in the surface acidity center of the catalyst is from 0.5 to 1.5.

11. The method according to claim 1 , comprising a total pore volume of the from 0.2 to 0.5 cm 3 /g.

12. The method according to claim 1 , comprising a specific surface of from 50 to 200 m 2 /g.

13. The method according to claim 1 , wherein the amount of alumina in the carrier is not less than 80 wt %.

14. The method according to claim 1 , wherein the alumina comprises a crystal form selected from γ, δ, θ, and combinations thereof.

15. The method according to claim 1 , wherein the catalyst is sulphurized before use, at a pressure of 0.5 to 3.0 MPa, a temperature of 200 to 500° C. and a space velocity of 0.5 to 5.0 h −1 .

16. The method according to claim 1 , wherein the catalyst is used at a pressure of 1.0 to 5.0 MPa, a hydrogen/polyunsaturated compound molar ratio of 1 to 20 mole/mole, a space velocity of 2.0 to 6.0 h −1 and a temperature of 50 to 250° C.

17. The method according to claim 16 , wherein the pressure is 2.0 to 4.0 MPa, the hydrogen/polyunsaturated compound molar ratio is 1 to 10 mole/mole, the space velocity is 2.0 to 5.0 h −1 , and the temperature is 70 to 200° C.

18. The method according to claim 1 , comprising a total pore volume of from 0.2 to 0.45 cm 3 /g.

19. The method according to claim 1 , comprising a specific surface of from 50 to 150 m 2 /g.

20. The method according to claim 1 , wherein the amount of alumina in the carrier is not less than 90 wt %.

Assignees

• Petrochina Co Ltd

Inventors

• Zhang Xuejun
• Wu Guanjing
• Wu Pingyi
• Yuan Xiaoliang
• Hou yuandong
• Zhang Yin
• Zhao Qinfeng
• Wang Shuqin
• Liu Kunhong

Classifications

• B01J2235/05

  Nuclear magnetic resonance [NMR] · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J23/888

  Tungsten · CPC title

• B01J35/1038

  Operations & Transport · mapped topic

• B01J23/85

  Chromium, molybdenum or tungsten · CPC title