Patent US4011276A successfully refreshed from Google Patents.
US4011276A
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Disproportionation of toluene
Assignee: Mobil Oil AS
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Filing: 1976-04-28
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Granted: 1977-03-08
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Expires: 1996-04-28
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 a minor proportion of an oxide of phosphorus and a minor proportion of an oxide of magnesium.
Inventors
- 👤 Chin-Chiun Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:52
CPC Classifications
C; C07; C07C; C07C4/00; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/76; C07C2/86; C07C2/862; C07C2/864; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/26; B01J2229/30; B01J2229/42; B01J29/65; B01J29/70; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 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 oxide and magnesium oxide, each in an amount of at least about 0.25 percent by weight.
Claim 2
Dependent Claim
100 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 oxide and magnesium oxide, each in an amount of at least about 0.25 percent by weight.
Claim 3
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 4
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein phosphorus and magnesium addition is accomplished as a result of contact of the crystalline aluminosilicate zeolite with a phosphorus and a magnesium compound.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein phosphorus oxide and magnesium oxide are each present in an amount of between about 0.25 and about 25 weight percent.
Claim 7
Dependent Claim
40 words
The process of claim 1 wherein said phosphorus oxide is present in an amount of between about 0.7 and about 15 weight percent and magnesium oxide is present in an amount of between about 1 and about 15 weight percent.
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 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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |