GB815278A - Nitriles and amides of pyridine carboxylic acids - Google Patents
Nitriles and amides of pyridine carboxylic acidsInfo
- Publication number
- GB815278A GB815278A GB39700/56A GB3970056A GB815278A GB 815278 A GB815278 A GB 815278A GB 39700/56 A GB39700/56 A GB 39700/56A GB 3970056 A GB3970056 A GB 3970056A GB 815278 A GB815278 A GB 815278A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pyridine carboxylic
- nitriles
- amides
- carboxylic acid
- niacinamide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
Pyridine carboxylic acid nitriles are prepared by passing a fluid stream consisting of or comprising vapours of the corresponding acid amide over a dehydration catalyst at a temperature ranging from 250 DEG to 550 DEG C. The nitriles may be hydrolysed to obtain purified amides substantially free of both colour and pyridine carboxylic acid. The dehydration catalyst is preferably silica gel, alumina gel or mixtures thereof. The vapours of the amide may be admixed with a non-condensible gas such as nitrogen or ammonia. The process is applicable to the purification of pyridine carboxylic acid amides containing minor amounts of the corresponding free acid, e.g. a niacinamide melt containing residual niacin (which may be prepared by passing ammonia through niacin and heating the mass to form a melt). The examples describe the preparation of nicotinonitrile, isonicotinonitrile and purified niacinamide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US815278XA | 1955-12-30 | 1955-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB815278A true GB815278A (en) | 1959-06-24 |
Family
ID=22164762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39700/56A Expired GB815278A (en) | 1955-12-30 | 1956-12-31 | Nitriles and amides of pyridine carboxylic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB815278A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0895986A2 (en) * | 1997-08-06 | 1999-02-10 | Toray Industries, Inc. | A process for producing a nitrile |
| WO2021017649A1 (en) * | 2019-08-01 | 2021-02-04 | 安徽瑞邦生物科技有限公司 | Method for purifying 4-cyanopyridine by means of melting and crystallizing |
-
1956
- 1956-12-31 GB GB39700/56A patent/GB815278A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0895986A2 (en) * | 1997-08-06 | 1999-02-10 | Toray Industries, Inc. | A process for producing a nitrile |
| EP0895986A3 (en) * | 1997-08-06 | 2001-08-29 | Toray Industries, Inc. | A process for producing a nitrile |
| WO2021017649A1 (en) * | 2019-08-01 | 2021-02-04 | 安徽瑞邦生物科技有限公司 | Method for purifying 4-cyanopyridine by means of melting and crystallizing |
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