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US3965208A
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Methylation of toluene
Assignee: Mobil Oil AS
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Filing: 1975-01-06
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Granted: 1976-06-22
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Expires: 1995-01-06
Abstract
Abstract Process for the methylation of toluene under conditions such that the formation of meta-xylene is suppressed and the formation of ortho and para-xylene is enhanced carried out 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, of from 1 to 12, said catalyst having been modified by the addition thereto of a Group VA element in an amount of at least 0.5 percent by weight.
Inventors
- 👤 Stephen Allan Butter
- 👤 Warren William Kaeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:17
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/48; B01J29/65; B01J37/00; B01J37/28; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/12; C07C2/54; C07C2/64; C07C2/66; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C2/865; C07C2/868; C07C4/00; C07C4/02; C07C4/06; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; C10G2400/00; C10G2400/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S208/00; Y10S208/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
104 words
A process for the methylation of toluene such that the formation of meta-xylene is suppressed and the formation of at least one isomer selected from the group consisting of ortho- and para-xylene is enhanced which comprises contacting toluene with a methylating agent under methylation 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, a constraint index within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus, arsenic or antimony in an amount of at least 0.5 percent by weight.
Claim 2
Dependent Claim
104 words
A process for the methylation of toluene such that the formation of meta-xylene is suppressed and the formation of at least one isomer selected from the group consisting of ortho- and para-xylene is enhanced which comprises contacting toluene with a methylating agent under methylation 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, a constraint index within the approximate range of 1 to 12, said catalyst having been modified by the addition thereto of phosphorus, arsenic or antimony in an amount of at least 0.5 percent by weight.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said addition is phosphorus.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein said addition is arsenic.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein said addition is antimony.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said methylating agent is methanol, methyl chloride, methyl bromide, dimethylether or dimethylsulfate.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is characterized by a silica/alumina ratio is excess of 30.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-11.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein said methylating agent is methanol.
Claim 11
Dependent Claim
24 words
The process of claim 2 wherein phosphorus addition is accomplished as a result of contact of the crystalline aluminosilicate zeolite with a phosphorus compound.
Claim 12
Dependent Claim
11 words
The process of claim 10 wherein said phosphorus compound is trimethylphosphite.
Claim 13
Dependent Claim
13 words
The process of claim 10 wherein said phosphorus compound is diphenyl phosphine chloride.
Claim 14
Dependent Claim
12 words
The process of claim 10 wherein said phosphorus compound is phosphoric acid.
Claim 15
Dependent Claim
13 words
The process of claim 10 wherein said phosphorus compound is diphenyl phosphinous acid.
Claim 16
Dependent Claim
11 words
The process of claim 10 wherein said phosphorus compound is trimethylphosphate.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein said addition is present in an amount of between about 0.5 and about 25 weight percent.
Claim 18
Dependent Claim
24 words
The process of claim 3 wherein arsenic addition is accomplished as a result of contact of the crystalline aluminosilicate zeolite with an arsenic compound.
Claim 19
Dependent Claim
12 words
The process of claim 17 wherein said arsenic compound is arsenic triethoxide.
Claim 20
Dependent Claim
24 words
The process of claim 4 wherein antimony addition is accomplished as a result of contact of the crystalline aluminosilicate zeolite with an antimony compound.
Claim 21
Dependent Claim
12 words
The process of claim 19 wherein said antimony compound is antimony trimethoxide.
Claim 22
Dependent Claim
11 words
The process of claim 1 wherein said crystalline zeolite is ZSM-21.
Claim 23
Dependent Claim
11 words
The process of claim 1 wherein said crystalline zeolite is ZSM-35.
Claim 24
Dependent Claim
12 words
The process of claim 10 wherein said phosphorus compound is diphenylphosphinic acid.
Claim 25
Dependent Claim
12 words
The process of claim 10 wherein said phosphorus compound is diethylchloro thiophosphate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |