US4137195A
Expired / Lapsed
US
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Catalyst for disproportionation of toluene
Assignee: Mobil Oil AS
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Filing: 1977-07-29
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Granted: 1979-01-30
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Expires: 1997-07-29
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 initial treatment with an ammonium phosphate followed by treatment with a magnesium compound to yield a composite containing 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
2026-11-08 15:17
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: 11
Claim 1
Independent Claim
71 words
A catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, said catalyst having been modified by initial treatment with an ammonium phosphate followed by treatment with a magnesium compound to yield a composite containing phosphorus oxide and magnesium oxide, each in an amount of at least about 0.25 percent by weight.
Claim 2
Dependent Claim
71 words
A catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, said catalyst having been modified by initial treatment with an ammonium phosphate followed by treatment with a magnesium compound to yield a composite containing phosphorus oxide and magnesium oxide, each in an amount of at least about 0.25 percent by weight.
Claim 3
Dependent Claim
11 words
The catalyst of claim 1 wherein said crystalline aluminosilicate is ZSM-5.
Claim 4
Dependent Claim
26 words
The catalyst 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 5
Independent Claim
107 words
A method for preparing a catalyst composition which comprises contacting a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12 with a solution of an ammonium phosphate, followed by maintaining the phosphorus-containing zeolite at a temperature between about 20° and about 100° C. to yield a product containing phosphorus oxide, contacting the resulting zeolite containing phosphorus oxide with a solution of a magnesium compound, followed by maintaining the zeolite at a temperature between about 20° and about 100° C. to yield a final product containing phosphorus oxide and magnesium oxide.
Claim 6
Independent Claim
107 words
A method for preparing a catalyst composition which comprises contacting a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12 with a solution of an ammonium phosphate, followed by maintaining the phosphorus-containing zeolite at a temperature between about 20° and about 100° C. to yield a product containing phosphorus oxide, contacting the resulting zeolite containing phosphorus oxide with a solution of a magnesium compound, followed by maintaining the zeolite at a temperature between about 20° and about 100° C. to yield a final product containing phosphorus oxide and magnesium oxide.
Claim 7
Dependent Claim
11 words
The method of claim 4 wherein said crystalline aluminosilicate is ZSM-5.
Claim 8
Dependent Claim
30 words
The method of claim 4 wherein said ammonium phosphate is ammonium monohydrogen phosphate (NH 4 ) 2 HPO 4 or ammonium dihydrogen phosphate NH 4 H 2 PO 4 .
Claim 9
Dependent Claim
12 words
The method of claim 4 wherein said magnesium compound is magnesium acetate.
Claim 10
Dependent Claim
30 words
The catalyst of claim 1 wherein said ammonium phosphate is ammonium monohydrogen phosphate (NH 4 ) 2 HPO 4 or ammonium dihydrogen phosphate NH 4 H 2 PO 4 .
Claim 11
Dependent Claim
37 words
The catalyst of claim 1 wherein the concentration of phosphorus oxide is between about 0.7 and about 15 percent by weight and the concentration of magnesium oxide is between about 1 and about 15 percent by weight.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |