Claims
- 1. A process for transalkylating benzene to produce monoalkylaromatics and polyalkylaromatics and recovering monoalkylaromatics, which process exhibits a selectivity for polyalkylaromatic production, the improvement comprising decreasing said selectivity, by contacting a feedstock consisting essentially of 40 to 80 wt % benzene, 15 to 50 wt. % dialkylbenzene, and 2 to 20 wt. % C.sub.9 monoalkylaromatics and 0 to 5 wt. % C.sub.9 +aromatics,
- with a catalyst comprising ZSM-5, wherein said ZSM-5 has a silica:alumina mole ratio of from about 20 to about 30 and an alpha value of at least about 140;
- undertaking said contacting at a temperature of from about 400.degree. F. to about 1000.degree. F., a pressure of from about 0 to about 3000 psig, a hydrogen/hydrocarbon mole ratio of from 0 to about 4 and a weight hourly space velocity, based upon weight of active catalyst component, of from about 0.1 hr .sup.-1 to about 100 hr .sup.-1 ; and
- recovering ethylbenzene.
- 2. The process of claim 1 wherein said zeolite has a silica/alumina mole ratio of from about 20 to about 30.
- 3. The process of claim 1 wherein said zeolite has an alpha value of about 200 to about 3500.
- 4. The process of claim 1 wherein said zeolite has an alpha value of about 500 to about 3000.
- 5. The process of claim 1 wherein said zeolite has the structure of ZSM-5.
- 6. The process of claim 1 wherein said zeolite contains cations selected from the group consisting of hydrogen and hydrogen precursor.
- 7. The process of claim 1 wherein said zeolite contains cations selected from the group consisting of hydrogen and hydrogen precursor.
- 8. The process of claim 1 wherein conditions effective for transalkylation include a temperature of from about 500.degree. to about 850.degree. F., a pressure of from about 25 to about 750 psig, a hydrogen/hydrocarbon mole ratio of from about 0 to 2 and a weight hourly space velocity, based upon weight of active catalyst component, of from about 1 to about 50 hr.sup.-1.
- 9. The process of claim 1 wherein said catalyst composition comprises said zeolite and a binder.
- 10. The process of claim 9 wherein said binder is selected from the group consisting of alumina, zirconia, silica, magnesia, thoria, titania, boria and a combination thereof.
- 11. The process of claim 10 wherein said binder comprises alumina.
- 12. The process of claim 1 wherein said catalyst composition is in the form of extrudate, beads, or fluidizable microspheres.
- 13. The process of claim 1 wherein said zeolite has the structure of ZSM-11.
Parent Case Info
This is a continuation of copending application Ser. No. 092,503, filed on Sept. 2, 1987, and now abandoned.
US Referenced Citations (21)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0141514 |
May 1985 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
92503 |
Sep 1987 |
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