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US4444989A
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Methylation of toluene to para-xylene catalyzed by crystalline silica
Assignee: EIDP Inc
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Filing: 1979-04-20
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Granted: 1984-04-24
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Expires: 1999-04-20
Abstract
Abstract An improved catalytic process for making para-xylene from toluene and a methylating agent employing the described crystalline silica as catalyst, said catalyst optionally promoted by one or more compounds of arsenic, phosphorus, magnesium, boron, antimony and amorphous silica. Preferred promoters are boron compounds, antimony compounds, and amorphous silica.
Inventors
- 👤 Frank E. Herkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:03
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/864; B; B01; B01J; B01J23/00; B01J23/02; B01J23/16; B01J23/18; B01J29/00; B01J29/03; B01J29/035; C07C2/865; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/30; B01J2229/32; B01J2229/42; C07C2529/00; C07C2529/03; C07C2529/035; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/582
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
69 words
In a process for preparing paraxylene by the catalytic reaction of toluene and a methylating agent, the improvement which comprises employing a catalyst of crystalline silica and, as promoter therefor, a member of the group consisting of arsenic oxide, magnesium oxide, boron oxide, antimony oxide, amorphous silica, and mixtures thereof, said promoter being present at 0 to about 50% based on total weight of metal oxide in the catalyst.
Claim 2
Dependent Claim
69 words
In a process for preparing paraxylene by the catalytic reaction of toluene and a methylating agent, the improvement which comprises employing a catalyst of crystalline silica and, as promoter therefor, a member of the group consisting of arsenic oxide, magnesium oxide, boron oxide, antimony oxide, amorphous silica, and mixtures thereof, said promoter being present at 0 to about 50% based on total weight of metal oxide in the catalyst.
Claim 3
Dependent Claim
10 words
A process according to claim 1, employing substantially 0% promoter.
Claim 4
Dependent Claim
11 words
A process according to claim 1, employing 0.3% to 25% promoter.
Claim 5
Dependent Claim
23 words
A process according to claim 1, employing as promoter a member of the group consisting of boron oxide, antimony oxide and amorphous silica.
Claim 6
Dependent Claim
20 words
A process according to claim 3 wherein the methylating agent is selected from the group consisting of methanol and dimethylether.
Claim 7
Dependent Claim
12 words
A process according to claim 4 wherein the promoter is boron oxide.
Claim 8
Dependent Claim
12 words
A process according to claim 4 wherein the promoter is antimony oxide.
Claim 9
Dependent Claim
12 words
A process according to claim 4 wherein the promoter is amorphous silica.
Claim 10
Dependent Claim
37 words
A process according to claim 1 wherein the mole ratio of toluene to methylating agent is about 1 to 50/1 and the weight of reactant feed per weight of catalyst per hour is about 1 to 500/1.
Claim 11
Dependent Claim
37 words
A process according to claim 5 wherein the mole ratio of toluene to methylating agent is about 1 to 50/1 and the weight of reactant feed per weight of catalyst per hour is about 1 to 500/1.
Claim 12
Dependent Claim
23 words
A process according to claim 9, employing as promoter a member of the group consisting of boron oxide, antimony oxide and amorphous silica.
Claim 13
Dependent Claim
23 words
A process according to claim 10 employing as promoter a member of the group consisting of boron oxide, antimony oxide and amorphous silica.
Claim 14
Dependent Claim
12 words
A process according to claim 12 wherein the promoter is boron oxide.
Claim 15
Dependent Claim
12 words
A process according to claim 12 wherein the promoter is antimony oxide.
Claim 16
Dependent Claim
12 words
A process according to claim 12 wherein the promoter is amorphous silica.
Claim 17
Dependent Claim
12 words
A process according to claim 12 wherein the methylating agent is dimethylether.
Claim 18
Dependent Claim
12 words
A process according to claim 12 wherein the methylating agent is methanol.
Claim 19
Dependent Claim
36 words
A process according to claim 17 wherein the mole ratio of toluene to methanol is about 5 to 15/1 and the weight of reactant feed per weight of catalyst per hour is about 3 to 100/1.
Claim 20
Dependent Claim
12 words
A process according to claim 18 wherein the promoter is amorphous silica.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |