Patent US4238630A successfully refreshed from Google Patents.
US4238630A
Expired / Lapsed
US
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Production of aromatic hydrocarbons
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-04-09
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Granted: 1980-12-09
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Expires: 1999-04-09
Abstract
Abstract Alkylation of aromatic hydrocarbons, especially toluene methylation, is carried out in the presence of a catalyst comprising an aluminosilicate zeolite of the ZSM-5 type in which some or all of the protons of the zeolite have been replaced by monovalent cations. Preferably, the replacement cations are sodium ions, the catalyst preferably containing more than 2% by weight of sodium.
Inventors
- 👤 David G. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:50
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7034; B01J29/40; C; C07; C07C; C07C2/00; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/70; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A process for the alkylation of an aromatic hydrocarbon which comprises contacting the aromatic hydrocarbon or a mixture comprising an aromatic hydrocarbon with an alkylating agent under reaction conditions which are effective for accomplishing alkylation of the aromatic hydrocarbon and in the presence of a catalyst comprising an aluminosilicate zeolite of the ZSM-5 type in which some or all of the protons of the zeolite have been replaced by monovalent cations, wherein the amount of said monovalent cation in the zeolite is at least 2.0% by weight.
Claim 2
Dependent Claim
87 words
A process for the alkylation of an aromatic hydrocarbon which comprises contacting the aromatic hydrocarbon or a mixture comprising an aromatic hydrocarbon with an alkylating agent under reaction conditions which are effective for accomplishing alkylation of the aromatic hydrocarbon and in the presence of a catalyst comprising an aluminosilicate zeolite of the ZSM-5 type in which some or all of the protons of the zeolite have been replaced by monovalent cations, wherein the amount of said monovalent cation in the zeolite is at least 2.0% by weight.
Claim 3
Dependent Claim
15 words
A process as claimed in claim 1 in which the monovalent cations comprise sodium cations.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1 in which the zeolite is ZSM-5, ZSM-8, ZSM-11 or ZSM-12.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 in which the aromatic hydrocarbon to be alkylated is toluene.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 in which the alkylating agent comprises an alcohol, an alkyl ester or an alkyl halide.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1 in which the molar ratio of aromatic hydrocarbons to alkylating agent is in the range 0.1:1 to 10:1.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 in which the process is effected in the presence of hydrogen.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 7 in which the mole ratio of hydrogen to aromatic hydrocarbon is in the range 0.1:1 to 20:1.
Claim 10
Dependent Claim
113 words
A process as claimed in claim 1 for the production of xylenes by methylation of toluene which comprises contacting toluene or a mixture comprising toluene with an alkylating agent selected from methanol, dimethylether and methyl halides at a temperature in the range 400° to 600° C., a pressure in the range 1 to 60 Bar, and at a weight hourly space velocity in the range 0.05 to 40 and in the presence of a catalyst comprising an aluminosilicate zeolite of the ZSM-5 type in which some or all of the protons of the zeolite have been replaced by sodium cations, the amount of sodium in the catalyst being greater than 2% by weight.
Claim 11
Dependent Claim
15 words
A process as claimed in claim 1, wherein said monovalent cations are alkali metal cations.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |