US3946020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pyridine bases
Assignee: Koei Chemical Co Ltd
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Filing: 1974-08-05
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Granted: 1976-03-23
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Expires: 1994-08-05
Abstract
Abstract Pyridine bases are produced in higher yield from at least one of aliphatic carbonyl compounds and ammonia by reaction at 350° to 550°C under the atmospheric pressure at a space velocity of 100 to 10,000 hr - 1 in the presence of a catalyst prepared by immersing silica-alumina or a silica-alumina mixture containing a promoter in an aqueous solution of ammonium halide such as ammonium chloride, ammonium iodide or ammonium bromide at a concentration of not more than 20% by weight at room temperature to 80°C, washing the immersed silica-alumina or the mixture with water, and drying and calcining the same at 300°C or higher. Regeneration of the catalyst after the reaction can be carried out for a much shortened time.
Inventors
- 👤 Yoshizo Minato
- 👤 Shikibu Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:38
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08; B; B01; B01J; B01J27/00; B01J27/06; B01J27/08; C07D213/09; C07D213/10; C07D213/12; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A process for producing pyridine bases, which comprises reacting at least one aliphatic carbonyl compound selected from the group consisting of formaldehyde, acetaldehyde, propionaldehyde, acrolein and acetone with 0.2 to 5 moles of ammonia per mole of the total carbonyl compounds in a gas phase at 350°C to 550°C at atmospheric pressure at a space velocity of 100 to 10,000 hr.sup. -1 in the presence of a catalyst consisting essentially of 95 to 70% by weight of silica and 5 to 30% by weight of alumina obtained by immersing silica-alumina in an aqueous solution of ammonium chloride, ammonium bromide or ammonium iodine at 25 to 80°C for 30 minutes to 5 days, washing with water, drying and calcining at 300°C or higher.
Claim 2
Dependent Claim
122 words
A process for producing pyridine bases, which comprises reacting at least one aliphatic carbonyl compound selected from the group consisting of formaldehyde, acetaldehyde, propionaldehyde, acrolein and acetone with 0.2 to 5 moles of ammonia per mole of the total carbonyl compounds in a gas phase at 350°C to 550°C at atmospheric pressure at a space velocity of 100 to 10,000 hr.sup. -1 in the presence of a catalyst consisting essentially of 95 to 70% by weight of silica and 5 to 30% by weight of alumina obtained by immersing silica-alumina in an aqueous solution of ammonium chloride, ammonium bromide or ammonium iodine at 25 to 80°C for 30 minutes to 5 days, washing with water, drying and calcining at 300°C or higher.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the said aliphatic carbonyl compound is a mixture of formaldehyde and acetaldehyde.
Claim 4
Dependent Claim
20 words
A process according to claim 1, wherein the said aliphatic carbonyl compound is a mixture of formaldehyde, acetaldehyde and propionaldehyde.
Claim 5
Dependent Claim
14 words
A process according to claim 1, wherein the said aliphatic carbonyl compound is acrolein.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the said aliphatic carbonyl compound is a mixture of formaldehyde and acetone.
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |