Methods of producing isomerization catalysts

Patent metadata

Field	Value
Publication number	US-11679378-B2
Application number	US-202117185257-A
Country	US
Kind code	B2
Filing date	Feb 25, 2021
Priority date	Feb 25, 2021
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

Methods of producing an isomerization catalyst include preparing a catalyst precursor solution, hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant, calcining the magnesium oxide precipitant to produce an isomerization catalyst precursor, soaking the isomerization catalyst precursor in an acid solution comprising sulfuric acid to product a isomerization catalyst precursor precipitant, and calcining the isomerization catalyst precursor precipitant to produce the isomerization catalyst. The catalyst precursor solution includes at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide. Methods of producing 1-butene from a 2-butene-containing feedstock with the isomerization catalyst are also disclosed.

First claim

What is claimed is:

1. A method of producing an isomerization catalyst, the method comprising:
preparing a catalyst precursor solution comprising at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide;
adjusting the pH of the catalyst precursor solution;
hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant;
calcining the magnesium oxide precipitant to produce an isomerization catalyst precursor;
soaking the isomerization catalyst precursor in an acid solution comprising sulfuric acid to produce a isomerization catalyst precursor precipitant; and
calcining the isomerization catalyst precursor precipitant to produce the isomerization catalyst.

2. The method of claim 1 , where the molar ratio of the magnesium precursor to the hydrolyzing agent in the catalyst precursor solution is from 1:10 to 1:1.

3. The method of claim 1 , where the molar ratio of the magnesium precursor to cetrimonium bromide in the catalyst precursor solution is from 1:0.01 to 1:0.1.

4. The method of claim 1 , where the pH of the catalyst precursor solution is adjusted to a pH of from 8 to 12.

5. The method of claim 1 , where hydrothermally treating the catalyst precursor solution comprises heating the catalyst precursor solution to a temperature of from 100° C. to 140° C. for a duration of from 48 hours to 96 hours.

6. The method of claim 1 , where the acid solution is a 0.5M to 1.2M sulfuric acid solution.

7. The method of claim 1 , where the isomerization catalyst precursor is soaked in the acid solution for 10 to 20 minutes.

8. An isomerization catalyst produced by the method of claim 1 .

9. The isomerization catalyst of claim 8 , where the BET surface area of the isomerization catalyst is less than 100 m 2 /g.

10. The isomerization catalyst of claim 8 , where the BET surface area of the isomerization catalyst is from 25 m 2 /g to 60 m 2 /g.

11. A method of producing 1-butene from a 2-butene-containing feedstock, the method comprising:
contacting the 2-butene-containing feedstock with an isomerization catalyst to produce an isomerization reaction effluent comprising 1-butene, the isomerization catalyst prepared by a method comprising:
preparing a catalyst precursor solution comprising at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide;
hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant;
calcining the magnesium oxide precipitant to produce an isomerization catalyst precursor;
soaking the isomerization catalyst precursor in an acid solution comprising sulfuric acid to produce a isomerization catalyst precursor precipitant; and
calcining the isomerization catalyst precursor precipitant to produce the isomerization catalyst.

12. The method of claim 11 , where contacting the 2-butene-containing feedstock with the isomerization catalyst causes the isomerization of at least a portion of 2-butene in the 2-butene-containing feedstock.

13. The method of claim 11 , where the molar ratio of the magnesium precursor to the hydrolyzing agent in the catalyst precursor solution is from 1:10 to 1:1.

14. The method of claim 11 , where the molar ratio of the magnesium precursor to cetrimonium bromide in the catalyst precursor solution is from 1:0.01 to 1:0.1.

15. The method of claim 11 , further comprising adjusting the pH of the catalyst precursor solution.

16. The method of claim 15 , where the pH of the catalyst precursor solution is adjusted to a pH of from 8 to 12.

17. The method of claim 11 , where the BET surface area of the isomerization catalyst is less than 100 m 2 /g.

18. The method of claim 11 , where the acid solution is a 0.5M to 1.2M sulfuric acid solution.

19. The method of claim 11 , where the isomerization catalyst precursor is soaked in the acid solution for 10 to 20 minutes.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alghannam Afnan
• Khokhar Munir D
• Shaikh Sohel K

Classifications

• C07C5/2506

  Catalytic processes · CPC title

• C07C11/08

  with four carbon atoms · CPC title

• B01J21/10 Primary

  Magnesium; Oxides or hydroxides thereof · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• B01J31/0231 Primary

  Halogen-containing compounds · CPC title