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Patent US4375573A successfully refreshed from Google Patents.
US4375573A
Expired / Lapsed
US
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Selective production and reaction of p-Disubstituted aromatics over zeolite ZSM-48
Assignee: Mobil Oil AS
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Filing: 1982-01-27
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Granted: 1983-03-01
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Expires: 2002-01-27
Abstract
Abstract Para-Disubstituted aromatics are produced in the presence of a catalyst comprising zeolite ZSM-48. Selective cracking of para-isomers may also be accomplished to produce mixtures rich in meta-isomers.
Inventors
- 👤 Lewis B. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:01
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/703; C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C2/865; C07C2/868; C07C6/00; C07C6/08; C07C6/12; C07C6/123; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/70
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
72 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 including a temperature of between about 350° C. and 750° C., a pressure of between about 1 atmosphere and 100 atmospheres, and a weight hourly space velocity of between about 0.25 and 20 with a catalyst comprising zeolite ZSM-48.
Claim 2
Dependent Claim
72 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 including a temperature of between about 350° C. and 750° C., a pressure of between about 1 atmosphere and 100 atmospheres, and a weight hourly space velocity of between about 0.25 and 20 with a catalyst comprising zeolite ZSM-48.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said zeolite is characterized by a silica/alumina ratio in excess of 30.
Claim 4
Dependent Claim
53 words
A process for selective reaction of 1,4-disubstituted aromatic compounds in a mixture of disubstituted aromatic compounds to produce a product enriched in 1,2- and/or 1,3-disubstituted aromatic isomers which comprises contacting said mixture under conversion conditions including a temperature of between about 150° C. and about 800° C. with a catalyst comprising zeolite ZSM-48.
Claim 5
Dependent Claim
53 words
A process for selective reaction of 1,4-disubstituted aromatic compounds in a mixture of disubstituted aromatic compounds to produce a product enriched in 1,2- and/or 1,3-disubstituted aromatic isomers which comprises contacting said mixture under conversion conditions including a temperature of between about 150° C. and about 800° C. with a catalyst comprising zeolite ZSM-48.
Claim 6
Dependent Claim
18 words
The process of claim 3 wherein said zeolite is characterized by a silica/alumina ratio in excess of 30.
Claim 7
Dependent Claim
14 words
The process of claim 2 wherein said silica/alumina ratio is at least about 50.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein said silica/alumina ratio is at least about 400.
Claim 9
Dependent Claim
14 words
The process of claim 4 wherein said silica/alumina ratio is at least about 50.
Claim 10
Dependent Claim
14 words
The process of claim 7 wherein said silica/alumina ratio is at least about 400.
Claim 11
Dependent Claim
54 words
A process for effecting the alkylation of mono-substituted aromatic compounds to produce a di-substituted aromatic product in which the para-isomer is in excess of normal equilibrium concentration which comprises contacting a mono-substituted aromatic compound with an alkylating agent under conditions effective for accomplishing said alkylation in the presence of a catalyst comprising zeolite ZSM-48.
Claim 12
Dependent Claim
54 words
A process for effecting the alkylation of mono-substituted aromatic compounds to produce a di-substituted aromatic product in which the para-isomer is in excess of normal equilibrium concentration which comprises contacting a mono-substituted aromatic compound with an alkylating agent under conditions effective for accomplishing said alkylation in the presence of a catalyst comprising zeolite ZSM-48.
Claim 13
Dependent Claim
20 words
The process of claim 9 wherein said mono-substituted aromatic compound is toluene and said alkylating agent is an ethylating agent.
Claim 14
Dependent Claim
22 words
The process of claim 10 wherein said ethylating agent is selected from the group consisting of ethylene, ethanol, ethylether, ethylchloride and ethylbromide.
Claim 15
Dependent Claim
11 words
The process of claim 11 wherein said ethylating agent is ethylene.
Claim 16
Dependent Claim
55 words
The process of claim 10 wherein said conditions include a temperature of between about 200° C. and 600° C., a pressure of between about 0.1 atmosphere and 100 atmospheres, a molar ratio of ethylating agent to toluene of between about 0.05 and 5, and a weight hourly space velocity of between about 1 and 100.
Claim 17
Dependent Claim
44 words
The process of claim 13 wherein said conditions include a temperature of between about 300° C. and 500° C., a pressure of between about 1 atmosphere and 50 atmospheres, and a molar ratio of ethylating agent to toluene of between about 0.1 and 2.
Claim 18
Dependent Claim
18 words
The process of claim 9 wherein said zeolite is characterized by a silica/alumina ratio in excess of 30.
Claim 19
Dependent Claim
14 words
The process of claim 15 wherein said silica/alumina ratio is at least about 50.
Claim 20
Dependent Claim
14 words
The process of claim 16 wherein said silica/alumina ratio is at least about 400.
Claim 21
Dependent Claim
20 words
The process of claim 9 wherein said mono-substituted aromatic compound is toluene and said alkylating agent is a methylating agent.
Claim 22
Dependent Claim
23 words
The process of claim 18 wherein said methylating agent is selected from the group consisting of methanol, methylchloride, methylbromide, dimethylether, methylcarbonate and dimethylsulfide.
Claim 23
Dependent Claim
11 words
The process of claim 19 wherein said methylating agent is methanol.
Claim 24
Dependent Claim
55 words
The process of claim 18 wherein said conditions include a temperature of between about 250° C. and 750° C., a pressure of between about 1 atmosphere and 100 atmospheres, a molar ratio of methylating agent to toluene of between about 0.05 and 5, and a weight hourly space velocity of between about 0.1 and 2000.
Claim 25
Dependent Claim
54 words
The process of claim 20 wherein said conditions include a temperature of between about 325° C. and 600° C., a pressure of between about 1 atmosphere and 100 atmospheres, a molar ratio of methanol to toluene of between about 0.1 and 2 and a weight hourly space velocity of between about 1 and 100.
Claim 26
Dependent Claim
26 words
The process of claim 9 wherein said mono-substituted aromatic compound is toluene, said alkylating agent is a propylating agent, and said di-substituted aromatic product comprises p-cymene.
Claim 27
Dependent Claim
22 words
The process of claim 23 wherein said propylating agent is selected from the group consisting of propylene, isopropylalcohol, isopropylether, isopropylchloride and isopropylbromide.
Claim 28
Dependent Claim
11 words
The process of claim 24 wherein said propylating agent is propylene.
Claim 29
Dependent Claim
55 words
The process of claim 23 wherein said conditions include a temperature of between about 150° C. and 500° C., a pressure of between about 0.1 atmosphere and 100 atmospheres, a molar ratio of propylating agent to toluene of between about 0.1 and 5, and a weight hourly space velocity of between about 1 and 100.
Claim 30
Dependent Claim
44 words
The process of claim 26 wherein said conditions include a temperature of between about 200° C. and 400° C., a pressure of between about 1 atmosphere and 50 atmospheres, and a molar ratio of propylating agent to toluene of between about 0.1 and 2.
References Cited (Backward Citations)
US4117026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |