Methods of preparing a catalyst

Patent metadata

Field	Value
Publication number	US-9988468-B2
Application number	US-201615281538-A
Country	US
Kind code	B2
Filing date	Sep 30, 2016
Priority date	Sep 30, 2016
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A method of preparing a catalyst comprising a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. % water; b) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst. A method of preparing a catalyst comprising contacting a hydrated support material comprising silica with a chromium-containing compound to form a first aqueous mixture comprising a chrominated support; contacting the first aqueous mixture comprising a chrominated support with a solution comprising (i) a solvent and (ii) an oxotitanium compound to form a second aqueous mixture comprising a pre-catalyst; and thermally treating the pre-catalyst to form the catalyst.

First claim

What is claimed is:

1. A method of preparing a catalyst comprising:
a) contacting (i) a silica-support, (ii) an oxotitanium compound, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media wherein the reaction media comprises from about 1 wt. % to about 20 wt. % water; and
b) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst.

2. The method of claim 1 wherein the reaction media comprises a liquid associated with the silica-support, a liquid associated with the oxotitanium compound, a liquid associated with the chromium-containing compound, and, when present, the solvent.

3. The method of claim 1 wherein the silica-support is characterized by a surface area of from about 100 m 2 /gram to about 1000 m 2 /gram and a pore volume of greater than about 1.0 cm 3 /gram.

4. The method of claim 1 wherein the chromium-containing compound comprises chromium trioxide, chromium acetate, chromium nitrate, tertiary butyl chromate, a diarene chromium (0) compound, biscyclopentadienyl chromium(II), chromium (III) acetylacetonate, or combinations thereof.

5. The method of claim 1 wherein an amount of chromium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst and an amount of titanium present in the catalyst ranges from about 0.01% to about 10% by weight of the catalyst.

6. The method of claim 1 wherein the reaction mixture excludes a titanium tetraalkoxide.

7. A method of preparing a catalyst comprising:
a) contacting (i) a silica-support, (ii) an oxotitanium compound characterized by a general formula R 1 R 2 TiO wherein R 1 and R 2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof, (iii) a chromium-containing compound, and (iv) an optional solvent to form a first aqueous mixture comprising a pre-catalyst and a reaction media having from about 1 wt. % to about 99 wt. % water; and
b) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst.

8. The method of claim 7 wherein R 1 and R 2 are each independently formate, acetate, propionate, ammonium oxalate, ammonium malonate, ammonium fumarate, or ammonium malate.

9. The method of claim 7 wherein R 1 and R 2 are each independently unsubstituted 2,4-pentadionate or substituted 2,4-pentadionate.

10. A method of preparing a polymer comprising contacting a catalyst prepared by the method of claim 1 with an ethylene monomer under conditions suitable for formation of an ethylene polymer; and recovering the polymer.

11. The method of claim 10 wherein the polymer has a high load melt index of from about 10 g/10 min and to about 60 g/10 min, a polydispersity index of greater than about 15 and a shear response of less than about 60.

12. The method of claim 10 wherein the polymer has a high load melt index of from about 10 g/10 min to about 60 g/10 min, a polydispersity index of greater than about 15 and a shear response of less than about 45.

13. A method of preparing a catalyst comprising:
contacting a hydrated support material comprising silica with a chromium-containing compound to form a first aqueous mixture comprising a chrominated support;
contacting the first aqueous mixture comprising a chrominated support with a solution comprising (i) a solvent and (ii) an oxotitanium compound to form a second aqueous mixture comprising a pre-catalyst, wherein the oxotitanium compound is characterized by a general formula R 1 R 2 TiO wherein R 1 and R 2 are each independently a carboxylate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof; and
thermally treating the pre-catalyst to form the catalyst.

14. The method of claim 13 wherein the first aqueous mixture comprises a liquid associated with the hydrated support material comprising silica and a liquid associated with the chromium-containing compound and wherein the second aqueous mixture comprises a liquid associated with the hydrated support material comprising silica, a liquid associated with the chromium-containing compound, a liquid associated with the oxotitanium compound, and the solvent.

15. The method of claim 13 wherein an amount of water present in the first or second aqueous mixture is in a range of from about 1 wt. % to about 50 wt. %.

16. The method of claim 13 wherein the chromium-containing compound comprises chromium trioxide, chromium acetate, chromium nitrate, tertiary butyl chromate, a diarene chromium (0) compound, biscyclopentadienyl chromium(II), chromium (III) acetylacetonate, or combinations thereof.

17. The method of claim 13 wherein R 1 and R 2 are each independently formate, acetate, propionate, ammonium oxalate, ammonium malonate, ammonium fumarate, or ammonium malate.

18. The method of claim 13 wherein R 1 and R 2 are each independently unsubstituted 2,4-pentadionate or substituted 2,4-pentadionate.

19. A method of preparing a catalyst comprising:
contacting a hydrated support material comprising silica with an oxotitanium compound to form a first aqueous mixture comprising a titanated support and a first reaction media wherein the first reaction media comprises from about 1 wt. % to about 20 wt. % water;
contacting the first aqueous mixture comprising a titanated support with a chromium-containing compound to form a second aqueous mixture comprising a pre-catalyst and a second reaction media wherein the second reaction media comprises from about 1 wt. % to about 20 wt. % water; and
thermally treating the pre-catalyst to form the catalyst.

20. A method of preparing a catalyst comprising:
a) contacting (i) a silica support material comprising from about 0.1 wt. % to about 20 wt. % water, (ii) a solution comprising (1) a 2,4-pentadionate oxotitanium compound, (2) a solvent and (3) from about 0.1 wt. % to about 80 wt. % water based on the total weight of the solution and (iii) a chromium-containing compound to form a pre-catalyst wherein liquid present in (i), (ii), and (iii) comprise a reaction media; and
b) thermally treating the pre-catalyst by heating to a temperature in the range of from about 500° C. to about 900° C. for a time period of from about 3 hours to about 12 hours to form a catalyst.

21. The method of claim 20 wherein thermally treating the pre-catalyst produces emission products comprising less than about 2 wt. % hydrocarbons based on a total weight of the emission products.

22. A pre-catalyst composition comprising: (i) a silica-support, (ii) an oxotitanium compound characterized by the general formula R 1 R 2 TiO wherein R 1 and R 2 are each independently a carboxylate, a dicarboxylate, a diketonate, an alkoxide, an ammonium salt of a dicarboxylate, an ammonium salt of a tricarboxylate or combinations thereof, and (iii) a chromium-containing compound.

23. The composition of claim 22 wherein titanium is present in an amount of from about 0.5 wt. % to about 10 wt. % and chromium is present in an amount of from about 0.2 wt. % to about 2 wt. % based on the total weight of the composition.

24. The composition of claim 22 wherein th

Assignees

• Chevron Phillips Chemical Co Lp

Inventors

• Mcdaniel Max P
• Schwerdtfeger Eric D
• Praetorius Jeremy M
• Solenberger Alan L
• Clear Kathy S

Classifications

• C08F10/02 Primary

  Ethene · CPC title

• C08F4/22

  of chromium, molybdenum or tungsten · CPC title

• C08F210/14

  Monomers containing five or more carbon atoms · CPC title

• C08F2500/04

  Broad molecular weight distribution, i.e. Mw/Mn > 6 · CPC title

• C08F4/16 Primary

  of silicon, germanium, tin, lead, titanium, zirconium or hafnium · CPC title