GB1022426A - Process for the treatment of cyanhydrins - Google Patents
Process for the treatment of cyanhydrinsInfo
- Publication number
- GB1022426A GB1022426A GB489865A GB489865A GB1022426A GB 1022426 A GB1022426 A GB 1022426A GB 489865 A GB489865 A GB 489865A GB 489865 A GB489865 A GB 489865A GB 1022426 A GB1022426 A GB 1022426A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid phase
- water
- organic solvent
- maintained
- mixture containing
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
- C07C45/516—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of nitrogen-containing compounds to >C = O groups
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/02—Preparation, separation or purification of hydrogen cyanide
- C01C3/0208—Preparation in gaseous phase
- C01C3/0245—Preparation in gaseous phase from organic nitriles, e.g. acetonitrile
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for the decomposition of cyanhydrins of aldehydes of aldehydes or ketones comprises introducing the cyanohydrin or a mixture containing the same into a liquid phase maintained at its boiling point and at a pH greater than 3.5, and passing steam through said liquid phase to produce a gaseous mixture containing steam, hydrocyanic acid and the corresponding carbonyl compound. The liquid phase may comprise water or an organic solvent or a mixture of water and a water-immiscible organic solvent. The pH may be maintained by feeding an alkaline substance such as an alkali metal hydroxide or carbonate, suitably as an aqueous solution, to the liquid phase. The process may be applied to acrolein cyanhydrin obtained as a by-product in the production of acrylonitrile by catalytic oxidation of propylene in the presence of ammonia, and the resulting acrolein and HCN may be recycled to the acrylonitrile process.ALSO:A process for the decomposition of cyanhydrins of aldehydes or ketones comprises introducing the cyanhydrin or a mixture containing the same into a liquid phase maintained at its boiling point and at a pH greater than 3.5, and passing steam through said liquid phase to produce a gaseous mixture containing steam, hydrocyanic acid and the corresponding carbonyl compound. The liquid phase may comprise water or an organic solvent or a mixture of water and a water-immiscible organic solvent. The pH may be maintained by feeding an alkaline substance such as an alkali metal hydroxide or carbonate, suitably as an aqueous solution to the liquid phase. The process may be applied to acrolein cyanhydrin obtained as a by-product in the production of acrylonitrile by catalytic oxidation of propylene in the presence of ammonia.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR962841A FR1392660A (en) | 1964-02-06 | 1964-02-06 | Process for the treatment of cyanohydrins |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1022426A true GB1022426A (en) | 1966-03-16 |
Family
ID=8822558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB489865A Expired GB1022426A (en) | 1964-02-06 | 1965-02-04 | Process for the treatment of cyanhydrins |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS4840325B1 (en) |
BE (1) | BE658849A (en) |
DE (1) | DE1255647B (en) |
FR (1) | FR1392660A (en) |
GB (1) | GB1022426A (en) |
NL (1) | NL145515B (en) |
-
1964
- 1964-02-06 FR FR962841A patent/FR1392660A/en not_active Expired
-
1965
- 1965-01-27 BE BE658849D patent/BE658849A/xx unknown
- 1965-02-02 JP JP528865A patent/JPS4840325B1/ja active Pending
- 1965-02-02 DE DES95289A patent/DE1255647B/en active Pending
- 1965-02-04 GB GB489865A patent/GB1022426A/en not_active Expired
- 1965-02-04 NL NL6501439A patent/NL145515B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
BE658849A (en) | 1965-05-17 |
NL6501439A (en) | 1965-08-09 |
NL145515B (en) | 1975-04-15 |
FR1392660A (en) | 1965-03-19 |
JPS4840325B1 (en) | 1973-11-30 |
DE1255647B (en) | 1967-12-07 |
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