US4016219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disproportionation of toluene
Assignee: Mobil Oil AS
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Filing: 1975-08-22
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Granted: 1977-04-05
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Expires: 1995-08-22
Abstract
Abstract Disproportionation of toluene to produce benzene and xylenes rich in the para isomer is accomplished by subjecting toluene to disproportionation conditions in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus in an amount of at least about 0.5 percent by weight.
Inventors
- 👤 Warren W. Kaeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:11
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A process for effecting disproportionation of toluene to produce benzene and xylenes in which the proportion of para-xylene isomer is in excess of its normal equilibrium concentration which comprises contacting toluene under conditions effective for accomplishing said disproportionation in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12, a constraint index within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus in an amount of at least about 0.5 percent by weight.
Claim 2
Dependent Claim
95 words
A process for effecting disproportionation of toluene to produce benzene and xylenes in which the proportion of para-xylene isomer is in excess of its normal equilibrium concentration which comprises contacting toluene under conditions effective for accomplishing said disproportionation in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12, a constraint index within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus in an amount of at least about 0.5 percent by weight.
Claim 3
Dependent Claim
20 words
The process oc claim 1 wherein said crystalline aluminosilicate zeolite is characterized by a silica/allumina ratio in excess of 30.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein phosphorus addition is accomplished as a result of contact of the crystalline aluminosilicate zeolite with a phosphorus compound.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein phosphorus is present in an amount of between about 0.5 and about 25 weight percent.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein of claim 1 wherein said phosphorus is present in an amount of between about 2 andd about 15 weight percent.
Claim 8
Dependent Claim
39 words
The process of claim 1 wherein the disproportionation conditions include a temperature of between about 800°F. and about 1400°F., a pressure between atmospheric and about 1000 psig and a weight hourly space velocity between about 0.5 and about 20.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein the crystalline aluminoxilicate zeolite is combined in an amount between about 1 and about 90 weight percent in a binder therefor.
Claim 10
Dependent Claim
10 words
The process of claim 8 wherein said binder is alumina.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is predominately in the hydrogen form.
Claim 12
Dependent Claim
15 words
The process of claim 3 wherein the ZSM-5 zeolite is predominately in the hydrogen form.
Claim 13
Dependent Claim
12 words
The process of claim 7 wherein the crystalline aluminosilicate zeolite is ZSM-5.
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein the ZSM-5 zeolite is predominately in the hydrogen form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |