GB828710A - Improvements in and relating to the production of acrylonitrile - Google Patents
Improvements in and relating to the production of acrylonitrileInfo
- Publication number
- GB828710A GB828710A GB17073/56A GB1707356A GB828710A GB 828710 A GB828710 A GB 828710A GB 17073/56 A GB17073/56 A GB 17073/56A GB 1707356 A GB1707356 A GB 1707356A GB 828710 A GB828710 A GB 828710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acrylonitrile
- lactonitrile
- hydrogen cyanide
- absorption zone
- gases
- 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
- C07C253/32—Separation; Purification; Stabilisation; Use of additives
- C07C253/34—Separation; Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Acrylonitrile is produced by passing through a reaction zone containing a heated aqueous cuprous chloride solution, acetylene, and hydrogen cyanide in an amount exceeding the amount required for the conversion of said acetylene to acrylonitrile, reacting said acetylene and hydrogen cyanide in said reaction zone to form acrylonitrile, passing the gases containing said acrylonitrile and acetaldehyde formed as a by-product in said reaction zone into an absorption zone, reacting said acetaldehyde and said excess of hydrogen cyanide in said absorption zone to form lactonitrile, removing said acrylonitrile and lactonitrile together from said absorption zone, recycling the residual gases into said reaction zone, and separating said acrylonitrile and lactonitrile. The formation of lactonitrile may be effected by means of an alkaline catalyst, e.g. sodium cyanide or sodium hydroxide. The absorption zone is maintained at a temperature of - 10 DEG to + 20 DEG C., advantageously about 0 DEG C. The acrylonitrile and lactonitrile are removed from the absorption in the form of an aqueous alkaline emulsion. Part of the emulsion may be recycled and passed through the absorption zone countercurrently to the gases to absorb the acrylonitrile contained therein. The emulsion can be stabilized by acidification and separated by distillation into acrylonitrile and lactonitrile. The latter may be acidulated with acetic acid and subjected to fractional distillation to split it into acetaldehyde and hydrogen cyanide. The hydrogen cyanide is recycled, with the gases leaving the absorption zone, to the reactor. The optimum concentration of HCN in the gases leaving the reactor is 10 to 15 g. per cu. m.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH828710X | 1955-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB828710A true GB828710A (en) | 1960-02-24 |
Family
ID=4540147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17073/56A Expired GB828710A (en) | 1955-06-02 | 1956-06-01 | Improvements in and relating to the production of acrylonitrile |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB828710A (en) |
-
1956
- 1956-06-01 GB GB17073/56A patent/GB828710A/en not_active Expired
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