GB1049427A - Process for purifying acrylonitrile - Google Patents
Process for purifying acrylonitrileInfo
- Publication number
- GB1049427A GB1049427A GB3209663A GB3209663A GB1049427A GB 1049427 A GB1049427 A GB 1049427A GB 3209663 A GB3209663 A GB 3209663A GB 3209663 A GB3209663 A GB 3209663A GB 1049427 A GB1049427 A GB 1049427A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acrylonitrile
- distillation
- acid
- crude
- water
- 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
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/08—Preparation of carboxylic acid nitriles by addition of hydrogen cyanide or salts thereof to unsaturated compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/32—Separation; Purification; Stabilisation; Use of additives
- C07C253/34—Separation; Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Acrylonitrile is freed from aldehydes and ketones by a process wherein crude acrylonitrile, which has been obtained by aqueous extraction from acrylonitrile-containing gases of reaction, subsequent separation of the crude acrylonitrile from the main portion of water by distilling in a stripper column, and separation from the distillate of the acrylonitrile-containing organic phase, which process comprises, if necessary, enrichment of the crude acrylonitrile with gaseous hydrocyanic acid, addition of an alkaline reaction medium as a catalyst for the formation of cyanohydrins, subsequent acidification with a mineral acid or an organic acid in a quantity at least sufficient for the neutralization of the previously utilized alkali, removal by distillation of substantially all of the water and, simultaneously at least the major portion of the free hydrocyanic acid, preferably returning the head fraction of the last distillation to the purifying process, especially to the cyanhydrin forming steps. Thin film evaporators are preferred in the rapid distillation stages. The invention is described with reference to a flow sheet (not shown) which provides for a continuous process and comprises four fractional distillation columns.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT658462A AT236357B (en) | 1962-08-16 | 1962-08-16 | Process for cleaning acrylonitrile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1049427A true GB1049427A (en) | 1966-11-30 |
Family
ID=3587769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3209663A Expired GB1049427A (en) | 1962-08-16 | 1963-08-14 | Process for purifying acrylonitrile |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT236357B (en) |
| CH (1) | CH424757A (en) |
| GB (1) | GB1049427A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3062652A1 (en) * | 2017-02-08 | 2018-08-10 | Rhodia Operations | PROCESS FOR PURIFYING NATURAL VANILLIN |
-
1962
- 1962-08-16 AT AT658462A patent/AT236357B/en active
-
1963
- 1963-06-27 CH CH796163A patent/CH424757A/en unknown
- 1963-08-14 GB GB3209663A patent/GB1049427A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3062652A1 (en) * | 2017-02-08 | 2018-08-10 | Rhodia Operations | PROCESS FOR PURIFYING NATURAL VANILLIN |
| WO2018146210A1 (en) * | 2017-02-08 | 2018-08-16 | Rhodia Operations | Method for the purification of natural vanillin |
| US10941100B2 (en) | 2017-02-08 | 2021-03-09 | Rhodia Operations | Method for the purification of natural vanillin |
Also Published As
| Publication number | Publication date |
|---|---|
| CH424757A (en) | 1966-11-30 |
| AT236357B (en) | 1964-10-26 |
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