Patent US3946020A successfully refreshed from Google Patents.
US3946020A
Expired / Lapsed
US
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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 03:48
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.
References Cited (Backward Citations)
GB900799A
Cited
US3280040A
Cited
GB1069368A
Cited
US3375064A
Cited
US3317438A
Cited
US3381011A
Cited
FR1563467A
Cited
GB1188891A
Cited
DE2054773A1
Cited
DE2064397A1
Cited
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 |