Claims
- 1. A process for converting a feedstock containing at least one C.sub.9 + aromatic compound to a product containing C.sub.6 -C.sub.8 aromatic compounds which comprises contacting said feedstock at conversion conditions with a catalyst comprising a zeolite characterized by an X-ray diffraction pattern including values set forth in Table I of the specification.
- 2. The process of claim 1 wherein the zeolite is MCM-22.
- 3. The process of claim 1 wherein the zeolite is characterized by an X-ray diffraction pattern including values set forth in Table II of the specification.
- 4. The process of claim 1 wherein the zeolite has equilibrium adsorption capacities greater than 4.5 wt. % for cyclohexane vapor and greater than 10 wt. % for n-hexane vapor.
- 5. The process of claim 1 wherein the zeolite has a composition comprising the molar relationship
- X.sub.2 O.sub.3 :(n)YO.sub.2),
- wherein n is at least 10, X is a trivalent element and Y is a tetravalent element.
- 6. The process of claim 5 wherein X is selected from the group consisting of aluminum, boron, gallium and combinations thereof and Y is selected from the group consisting of silicon, germanium and combination thereof.
- 7. The process of claim 5 wherein X comprises aluminum and Y comprises silicon.
- 8. The process of claim 1 wherein the zeolite has been treated to replace original cations, at least in part, with a cation or mixture of cations, or to otherwise acquire a cation or mixture of cations, selected from the group consisting of hydrogen, hydrogen precursors, rare earth metals, and metals of Groups IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VIB and VIII of the Periodic Table.
- 9. The process of claim 1 wherein the zeolite has been thermally treated at a temperature up to about 925.degree. C. in the presence or absence of steam.
- 10. The process of claim 8 wherein the zeolite has been thermally treated at a temperature up to about 925.degree. C. in the presence or absence of steam.
- 11. The process of claim 1 wherein the C.sub.9 + aromatics represent at least about 3 wt % of the total feedstock, the balance of the feedstock comprising benzene, toluene, or a mixture thereof.
- 12. The process of claim 1 wherein C.sub.9 + aromatics represent from about 10 to about 70 wt % of the total feedstock, the balance of the feedstock comprising benzene, toluene or a mixture thereof.
- 13. The process of claim 1 wherein the conversion conditions include a temperature of from about 600.degree. F. to about 1100.degree. F., a pressure of from atmospheric to about 1000 psig and a hydrogen to hydrocarbon mole ratio of from 0 to about 10.
- 14. The process of claim 1 wherein the zeolite possesses a Constraint Index of from 1 to about 2.5.
- 15. The process of claim 1 wherein the product comprises xylenes and benzene in a xylenes/benzene mole ratio of greater than about 0.8.
- 16. A process for converting feedstock containing at least one C.sub.9 + aromatic compound to a product containing C.sub.6 -C.sub.8 aromatic compounds which comprises contacting said feedstock at conversion conditions with a catalyst composition comprising zeolite beta wherein said zeolite beta has been steamed to reduce acidity.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. patent application Ser. No. 469,645, filed Jan. 24, 1990, now abandoned, which is a continuation-in-part of U.S. patent application Ser. No. 254,524, filed Oct. 6, 1988, now U.S. Pat. No. 4,954,325, which is a continuation-in-part of U.S. patent application Ser. No. 98,176, filed Sept. 18, 1987, now abandoned, which is a continuation-in-part of U.S. patent application Ser. No. 890,268, filed Jul. 29, 1986, now abandoned.
US Referenced Citations (50)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0231860 |
Aug 1987 |
EPX |
0293032 |
Nov 1988 |
EPX |
Continuation in Parts (4)
|
Number |
Date |
Country |
Parent |
469645 |
Jan 1990 |
|
Parent |
252524 |
Oct 1988 |
|
Parent |
98176 |
Sep 1987 |
|
Parent |
890268 |
Jul 1986 |
|