Process for the removal of soot from a sulfurous gas stream

Patent metadata

Field	Value
Publication number	US-10322374-B2
Application number	US-201615567005-A
Country	US
Kind code	B2
Filing date	Apr 13, 2016
Priority date	Apr 21, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

In a process for the removal of soot from a sulfurous gas stream, a process gas containing O2 and more than 500 ppm SO2 and/or SO3 together with soot is brought into contact with a VK type catalyst in a reactor, said catalyst comprising vanadium pentoxide (V2O5), sulfur in the form of sulfate, pyrosulfate, tri- or tetrasulfate and one or more alkali metals, such as Na, K, Rb or Cs, on a porous carrier, preferably a silicon dioxide carrier.

First claim

The invention claimed is:

1. A process for the removal of soot comprising >90 wt % C from a sulfurous gas stream, wherein a process gas containing O 2 and more than 500 ppm SO 2 and/or SO 3 and a soot concentration of >2 mg/Nm 3 /h is brought into contact with a catalyst in a reactor, said catalyst comprising vanadium pentoxide (V 2 O 5 ), sulfur in the form of sulfate, pyrosulfate, tri- or tetrasulfate and one or more alkali metals on a porous carrier.

2. Process according to claim 1 , wherein the porous carrier of the catalyst is silicon dioxide (SiO 2 ).

3. Process according to claim 2 , wherein the porous carrier of the catalyst is SiO 2 with <10 wt % of alumina.

4. Process according to claim 3 , wherein the porous carrier of the catalyst is SiO 2 with <2 wt % of alumina.

5. Process according to claim 3 , wherein the porous carrier of catalyst is SiO 2 with <1 wt % of alumina.

6. Process according to claim 1 , wherein the alkali metal content of the catalyst is 2-25 wt %.

7. Process according to claim 1 , wherein the catalyst contains 1-15 wt % V 2 O 5 .

8. Process according to claim 7 , wherein the catalyst contains 2-12 wt % V 2 O 5 .

9. Process according to claim 1 , wherein the catalyst contains 1-25 wt % sulfur in the form of sulfate, pyrosulfate, tri- or tetrasulfate.

10. Process according to claim 9 , wherein the catalyst contains 2-20 wt % sulfur in the form of sulfate, pyrosulfate, tri- or tetrasulfate.

11. Process according to claim 10 , wherein the catalyst contains 4-16 wt % sulfur in the form of sulfate, pyrosulfate, tri- or tetrasulfate.

12. Process according to claim 1 , wherein the catalyst temperature is 250-700° C.

13. Process according to claim 12 , wherein the catalyst temperature is 300-650° C.

14. Process according to claim 1 , wherein the process gas has a soot concentration of >5 mg/Nm 3 /h.

15. Process according to claim 14 , wherein the process gas has a soot concentration of >20 mg/Nm 3 /h.

16. Process according to claim 14 , wherein the process gas has a soot concentration of >50 mg/Nm 3 /h.

17. Process according to claim 1 , wherein the process gas contains more than 1000 ppm SO 2 and/or SO 3 .

18. Process according to claim 17 , wherein the process gas contains more than 5000 ppm SO 2 and/or SO 3 .

19. Process according to claim 1 , wherein the soot in the process gas has a composition comprising >95 wt % C.

20. Process according to claim 1 , wherein the soot is carbon black.

21. Process according to claim 1 , wherein the alkali metal content of the catalyst is 8-16 wt %.

22. Process according to claim 1 , wherein the process gas contains more than 2500 ppm SO 2 and/or SO 3 .

Assignees

• Haldor Topsoe As

Inventors

• Sørensen Per Aggerholm
• Christensen Kurt Agerbaek

Classifications

• B01D53/944 Primary

  Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445) · CPC title

• B01J23/22

  Vanadium · CPC title

• B01J27/055

  with alkali metals, copper, gold or silver · CPC title

• B01J21/08

  Silica · CPC title

• B01D2255/20723

  Vanadium · CPC title