Zeolite Y alkylation catalysts
View Patent ↗The present invention is directed to a zeolite Y catalyst having a controlled macropore structure. The present invention is also directed to a zeolite Y catalyst composite and a process for preparing the catalyst composite. The catalyst composite exhibits reduced deactivation rates during the alkylation process, thereby increasing the life of the catalyst. The present invention is also directed to processes for the preparation of carbonated, overbased aromatic sulfonates, which processes comprise alkylation, carbonation of aromatic hydrocarbons with one or more olefins.
1. A catalyst having a macropore structure comprising zeolite Y wherein the peak macropore diameter of the catalyst, measured by ASTM Test No. D 4284-03, is less than about 2000 angstroms and the cumulative pore volume of the catalyst at pore diameters less than or equal to about 500 angstroms, measured by ASTM Test No. D 4284-03, is less than or equal to about 0.30 milliliters per gram.
2. The catalyst of claim 1 wherein the cumulative pore volume at pore diameters less than or equal to about 400 angstroms is less than about 0.30 milliliters per gram.
3. The catalyst of claim 2 wherein the cumulative pore volume at pore diameters less than or equal to about 300 angstroms is less than about 0.25 milliliters per gram.
4. The catalyst of claim 3 wherein the cumulative pore volume at pore diameters less than or equal to about 300 angstroms is less than about 0.20 milliliters per gram.
5. The catalyst of claim 4 wherein the cumulative pore volume of the catalyst at pore diameters less than or equal to about 400 angstroms is in the range of about 0.05 milliliters per gram to about 0.18 milliliters per gram.
6. The catalyst of claim 5 wherein the cumulative pore volume of the catalyst at pore diameters less than or equal to about 300 angstroms Is in the range of about 0.08 milliliters per gram to about 0.16 milliliters per gram.
7. The catalyst of claim 1 wherein the peak macropore diameter is in the range of about 700 angstroms to about 1800 angstroms.
8. The catalyst of claim 7 wherein the peak macropore diameter Is in the range of about 750 angstroms to about 1600 angstroms.
9. The catalyst of claim 8 wherein the peak macropore diameter of the catalyst is in the range of about 900 angstroms to about 1400 angstroms.
10. The catalyst of claim 1 wherein the zeolite Y has a silica to alumina ratio of about 5:1 to about 100:1.
11. The catalyst of claim 10 wherein the zeolite Y has a silica to alumina ratio of about 30:1 to about 80:1.
12. The catalyst of claim 11 wherein the zeolite Y has the silica to alumina ratio of about 50:1 to about 70:1.
13. The catalyst of claim 1 wherein the catalyst is in the form of a tablet.
14. The catalyst of claim 13 wherein peak macropore diameter of the catalyst is in the range of about 500 angstroms to about 1500 angstroms and cumulative pore volume at pore diameters less than or equal to about 500 angstroms is in the range of about 0.05 milliliters per gram to about 0.15 milliliters per gram.
15. A catalyst composite comprising:
(a) the catalyst of claim 1 ; and
(b) a binder.
16. The catalyst composite of claim 15 wherein the binder is alumina.
17. The catalyst composite of claim 15 wherein the zeolite Y is present in the range of about 40 weight percent to about 99 weight percent based on the total dry weight of the catalyst composite.
18. The catalyst composite of claim 17 wherein the zeolite Y is present in the range of about 50 weight percent to about 85 weight percent based on the total dry weight of the catalyst composite.
19. A process for preparing a catalyst composite wherein the peak macropore diameter of the catalyst, measured by ASTM Test No. D 4284-03, is less than about 2000 angstroms and the cumulative pore volume of the catalyst at pore diameters less than or equal to about 500 angstroms, measured by ASTM Test No. D 4284-03, is less than or equal to about 0.30 milliliters per gram, comprising:
(a) contacting a zeolite Y with a binder in the presence of volatiles to form a mixture wherein the weight percent of zeolite Y is in the range of about 40 to about 99 percent based on the total dry weight of the resulting catalyst composite, and wherein the volatiles in the mixture are in the range of about 30 weight percent to about 70 weight percent of the mixture;
(b) shaping the mixture to form a composite;
(c) drying the composite; and
(d) calcining the composite in a substantially dry environment.
20. The process of claim 19 wherein in step (b) shaping comprises extruding.
21. The process of claim 19 wherein in step (a) the weight percent of zeolite Y is in the range of about 50 to about 85.
22. The process of claim 19 wherein the binder is alumina.
23. The process of claim 19 wherein in step (a) the volatiles in the mixture are present in the range of about 40 weight percent to about 60 weight percent of the mixture.
24. The process of claim 23 wherein the volatiles comprise water and an acid.
25. A catalyst composite prepared by the process of claim 19 .