Granted Patent B2

US 8,507,720 · App. 12/657,893 · Granted Aug 13, 2013

Abstract

Claims (20)

1. An acetoxylation catalyst comprising:

(a) palladium and

(b) an extrudate wherein the extrudate comprises

(i) at least 80 wt % titania and 0.1 to 15 wt % alumina; and

(ii) cellulose

wherein the palladium is supported on the extrudate.

2. The catalyst of claim 1 wherein the extrudate comprises 0.2 to 10 wt % alumina.

3. The catalyst of claim 1 wherein the extrudate comprises 0.5 to 5 wt % alumina.

4. The catalyst of claim 1 further comprising a Group 11 metal.

5. The catalyst of claim 4 wherein the Group 11 metal is gold.

6. The catalyst of claim 1 wherein the amount of palladium is 0.05 to 3 wt % of the catalyst.

7. The catalyst of claim 1 wherein the extrudate is produced by using an extrusion aid comprising a carboxyalkyl cellulose and a hydroxyalkyl cellulose.

8. The catalyst of claim 7 wherein the weight ratio of the carboxyalkyl cellulose to the hydroxyalkyl cellulose is from 3:1 to 1:1.

9. The catalyst of claim 7 wherein the hydroxyalkyl cellulose is selected from the group consisting of methyl 2-hydroxypropyl cellulose, methyl 2-hydroxethyl cellulose, and mixtures thereof.

10. The catalyst of claim 1 wherein the extrudate is calcined at a temperature of 650 to 750° C.

11. A process for preparing vinyl acetate comprising reacting ethylene, oxygen, and acetic acid in the presence of the catalyst of claim 1 .

12. The process of claim 11 wherein the extrudate comprises 0.2 to 10 wt % alumina.

13. The process of claim 11 wherein the extrudate comprises 0.5 to 5 wt % alumina.

14. The process of claim 11 wherein the catalyst of claim 1 further comprises a Group 11 metal.

15. The process of claim 14 wherein the Group 11 metal is gold.

Assignments (11)