Patent US4073787A successfully refreshed from Google Patents.
US4073787A
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Manufacture of pyridine and methylpyridines
Assignee: Imperial Chemical Industries Ltd
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Filing: 1977-01-17
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Granted: 1978-02-14
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Expires: 1997-01-17
Abstract
Abstract The present invention involves the manufacture of pyridine and/or methylpyridines, which comprises the catalytic vapor phase reaction of 1,3-butadiene, formaldehyde and ammonia in the presence of a gaseous diluent such as steam.
Inventors
- 👤 John I. Darragh
- 👤 Hugh S. Inglis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:09
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08; C07D213/09; C07D213/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A process for the manufacture of pyridine which comprises the vapor-phase reaction, in the presence of a catalyst comprising silica-alumina and at a temperature in the range from 300° C to 550° C, of 1,3-butadiene, formaldehyde and ammonia in the presence of a gaseous diluent comprising steam wherein the proportions of the reactants are at least 0.5 mole of ammonia per total mole of formaldehyde and butadiene and at least 0.2 mole of formaldehyde per mole of butadiene and wherein the proportion of steam is at least 3 moles of steam per total mole of formaldehyde and butadiene.
Claim 2
Dependent Claim
98 words
A process for the manufacture of pyridine which comprises the vapor-phase reaction, in the presence of a catalyst comprising silica-alumina and at a temperature in the range from 300° C to 550° C, of 1,3-butadiene, formaldehyde and ammonia in the presence of a gaseous diluent comprising steam wherein the proportions of the reactants are at least 0.5 mole of ammonia per total mole of formaldehyde and butadiene and at least 0.2 mole of formaldehyde per mole of butadiene and wherein the proportion of steam is at least 3 moles of steam per total mole of formaldehyde and butadiene.
Claim 3
Dependent Claim
16 words
A process as set forth in claim 1 in which there is also produced a methylpyridine.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the reaction is carried out at a temperature in the range from 300° C to 400° C.
Claim 5
Dependent Claim
22 words
A process according to claim 1 wherein at least 1 mole of ammonia is employed per total mole of formaldehyde and butadiene.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein the reaction mixture comprises molecular oxygen.
References Cited (Backward Citations)
US2549651A
Cited
US3575986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |