US4182923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disproportionation of toluene
Assignee: Mobil Oil AS
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Filing: 1978-02-24
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Granted: 1980-01-08
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Expires: 1998-02-24
Abstract
Abstract Disproportionation of toluene with high conversion thereof 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, which catalyst has undergone prior modification by treatment with an ammonium hydrogen phosphate to deposit at least about 0.5 weight percent of phosphorus thereon.
Inventors
- 👤 Chin-Chiun Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:58
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A process for effecting disproportionation of toluene with high conversion thereof to produce benzene and xylenes in which the proportion of para-xylene 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 enhanced activity as a result of prior modification by treatment with an ammonium hydrogen phosphate to deposit at least about 0.5 weight percent of phosphorus thereon.
Claim 2
Dependent Claim
105 words
A process for effecting disproportionation of toluene with high conversion thereof to produce benzene and xylenes in which the proportion of para-xylene 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 enhanced activity as a result of prior modification by treatment with an ammonium hydrogen phosphate to deposit at least about 0.5 weight percent of phosphorus thereon.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said ammonium hydrogen phosphate is diammonium hydrogen phosphate.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said ammonium hydrogen phosphate is ammonium dihydrogen phosphate.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said crystalline aluminosilicate is ZSM-5.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein said phosphorus is present in an amount between about 0.5 and about 25 weight percent.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is characterized by a silica/alumina ratio in excess of 30.
Claim 8
Dependent Claim
41 words
The process of claim 1 wherein the disproportionation conditions include a temperature of between about 390° F. and about 1400° F., a pressure between atmospheric and about 1000 psig and a weight hourly space velocity between about 0.08 and about 20.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein the crystalline aluminosilicate 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 4 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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |