EPOXIDATION CATALYST, A PROCESS FOR PREPARING THE CATALYST, AND A PROCESS FOR THE PRODUCTION OF AN OLEFIN OXIDE

• US 20120323026A1
• Filed: 02/24/2011
• Published: 12/20/2012
• Est. Priority Date: 03/01/2010
• Status: Active Grant

• Current Assignee: Shell USA Incorporated (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Lockemeyer, John Robert, Matusz, Marek, Yeates, Randall Clayton
• Granted Patent: US 8,937,031 B2
• Time in Patent Office: Days
• US Class Current: 549/536
• CPC Class Codes: B01J 27/047 with chromium, molybdenum, tungsten or polonium
• CPC Class Codes: B01J 27/051 Molybdenum
• CPC Class Codes: B01J 27/188 with chromium, molybdenum, tungsten or polonium
• CPC Class Codes: B01J 27/19 Molybdenum
• CPC Class Codes: B01J 35/66 Pore distribution
• CPC Class Codes: B01J 35/695 polymodal
• CPC Class Codes: B01J 37/0201 Impregnation
• CPC Class Codes: C07C 213/04 by reaction of ammonia or amines with olefin oxides or halohydrins
• CPC Class Codes: C07C 215/08 with only one hydroxy group and one amino group bound to the carbon skeleton
• CPC Class Codes: C07D 301/10 with catalysts containing silver or gold
• CPC Class Codes: Y02P 20/141 Feedstock

Abstract

A catalyst for the epoxidation of an olefin comprising a carrier and, deposited thereon, silver, a rhenium promoter, a first co-promoter, and a second co-promoter; wherein

• • the quantity of the rhenium promoter deposited on the carrier is greater than 1 mmole/kg, relative to the weight of the catalyst;
  • the first co-promoter is selected from sulfur, phosphorus, boron, and mixtures thereof;
  • the second co-promoter is selected from tungsten, molybdenum, chromium, and mixtures thereof;
  • the total quantity of the first co-promoter and the second co-promoter deposited on the carrier is at most 5.0 mmole/kg, relative to the weight of the catalyst; and
  • wherein the carrier has a monomodal, bimodal or multimodal pore size distribution, a pore diameter of 0.01-200 μm, a specific surface area of 0.03-10 m²/g, a pore volume of 0.2-0.7 cm³/g, wherein the median pore diameter is 0.1-100 μm, and a water absorption of 10-80%.

Claims

1. A catalyst for the epoxidation of an olefin comprising a carrier and, deposited on the carrier, silver, a rhenium promoter, a first co-promoter, and a second co-promoter;

wherein;

a) the quantity of the rhenium promoter deposited on the carrier is greater than 1 mmole/kg, relative to the weight of the catalyst;

b) the first co-promoter is selected from sulfur, phosphorus, boron, and mixtures thereof;

c) the second co-promoter is selected from tungsten, molybdenum, chromium, and mixtures thereof;

d) the total quantity of the first co-promoter and the second co-promoter deposited on the carrier is at most 5.0 mmole/kg, relative to the weight of the catalyst; and

e) said carrier has a monomodal, bimodal or multimodal pore size distribution, with a pore diameter range of 0.01-200 μ

m, a specific surface area of 0.03-10 m²/g, a pore volume of 0.2-0.7 cm³/g, wherein the median pore diameter of said carrier is 0.1-100 μ

m and has a water absorption of 10-80%.

2. The catalyst as claimed in claim 1, wherein the quantity of the rhenium promoter is at least 1.25 mmole/kg, relative to the weight of the catalyst.

3. The catalyst as claimed in claim 2, wherein the quantity of the rhenium promoter is in the range of from 1.25 to 50 mmole/kg, relative to the weight of the catalyst.

4. The catalyst as claimed in claim 1, wherein a fluoride-containing species and a strength-enhancing additive are incorporated into said carrier.

5. The catalyst as claimed in claim 4, wherein said fluoride-containing species is ammonium fluoride.

6. The catalyst as claimed in claim 4, wherein said strength-enhancing additive is selected from the group consisting of a zirconium species, a lanthanide Group species, a calcium species, a magnesium species, inorganic glass, and mixtures thereof.

7. The catalyst as claimed in claim 1, wherein the catalyst further comprises a further element selected from nitrogen, fluorine, alkali metals, alkaline earth metals, titanium, hafnium, zirconium, vanadium, thallium, thorium, tantalum, niobium, gallium and germanium and mixtures thereof.

8. The catalyst as claimed in claim 1, wherein the catalyst has a water extractable quantity of potassium in the range of from 1.25 to 10 mmole/kg, relative to the weight of the catalyst.

9. The catalyst as claimed in claim 1, wherein said carrier has a surface area of at least 1 m²/g, and a pore size distribution such that pores with diameters in the range of from 0.2 to 10 μ

m represent at least 70% of the total pore volume and such pores together provide a pore volume of at least 0.27 ml/g, relative to the weight of the carrier.

10. The catalyst as claimed in claim 1, wherein said carrier has a median pore diameter of more than 0.5 μ

m, and a pore size distribution wherein at least 80% of the total pore volume is contained in pores with diameters in the range of from 0.1 to 10 μ

m and at least 80% of the pore volume contained in the pores with diameters in the range of from 0.1 to 10 μ

m is contained in pores with diameters in the range of from 0.3 to 10 μ

m.

11. The catalyst as claimed in claim 1, wherein said carrier has at least two log differential pore volume distribution peaks in a pore diameter range of 0.01-100 μ

m and at least one peak of the above peaks is present in a pore diameter range of 0.01-1.0 μ

m in the pore size distribution measured by mercury porosimetry, wherein each peak is a maximum value of the log differential pore volume distribution of 0.2 cm³/g or larger.

12. The catalyst as claimed in claim 1, wherein said carrier has a bimodal pore size distribution, with a first mode of pores which has a mean diameter ranging from about 0.01 m to about 5 μ

m, and a second mode of pores which has a mean diameter ranging from about 5 μ

m to about 30 μ

m.

13. The catalyst as claimed in claim 1, wherein said carrier has a pore volume from pores with less than 1 micron in diameter of less than 0.20 ml/g, a pore volume from pores with greater than 5 micron in diameter of less than 0.20 ml/g, and a pore volume from pores between 1 micron in diameter and 5 microns in diameter at least 40 percent of a total pore volume.

15. A process for preparing an olefin oxide by reacting a feed comprising an olefin and oxygen in the presence of a catalyst as claimed in claim 1.

16. The process as claimed in claim 15, wherein the olefin comprises ethylene.

17. A process for preparing a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, or an alkanolamine comprising converting an olefin oxide into the 1,2-diol, the 1,2-diol ether, the 1,2-carbonate, or the alkanolamine, wherein the olefin oxide has been prepared by the process for preparing an olefin oxide as claimed in claim 16.

14. A process for preparing a catalyst for the epoxidation of an olefin comprising depositing silver, a rhenium promoter, a first co-promoter, and a second co-promoter on a carrier;

wherein

a) the quantity of the rhenium promoter deposited on the carrier is greater than 1 mmole/kg, relative to the weight of the catalyst;

b) the first co-promoter is selected from sulfur, phosphorus, boron, and mixtures thereof;

c) the second co-promoter is selected from tungsten, molybdenum, chromium, and mixtures thereof;

d) the total quantity of the first co-promoter and the second co-promoter deposited on the carrier is at most 5.0 mmole/kg, relative to the weight of the catalyst; and

e) said carrier has a monomodal, bimodal or multimodal pore size distribution, with a pore diameter range of 0.01-200 μ

m, a specific surface area of 0.03-10 m²/g, a pore volume of 0.2-0.7 cm³/g, wherein the median pore diameter of said carrier is 0.1-100 μ

m and has a water absorption of 10-80%.