GB834265A - Improvements in or relating to the preparation of acrylonitrile - Google Patents
Improvements in or relating to the preparation of acrylonitrileInfo
- Publication number
- GB834265A GB834265A GB29527/56A GB2952756A GB834265A GB 834265 A GB834265 A GB 834265A GB 29527/56 A GB29527/56 A GB 29527/56A GB 2952756 A GB2952756 A GB 2952756A GB 834265 A GB834265 A GB 834265A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acrylonitrile
- column
- distillation
- h3po4
- acetaldehyde
- 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
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 title abstract 11
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 abstract 8
- 239000007864 aqueous solution Substances 0.000 abstract 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 4
- 238000004821 distillation Methods 0.000 abstract 4
- 238000000034 method Methods 0.000 abstract 4
- 235000011007 phosphoric acid Nutrition 0.000 abstract 4
- 239000002253 acid Substances 0.000 abstract 2
- 238000010533 azeotropic distillation Methods 0.000 abstract 2
- 239000003054 catalyst Substances 0.000 abstract 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 abstract 2
- WOFDVDFSGLBFAC-UHFFFAOYSA-N lactonitrile Chemical compound CC(O)C#N WOFDVDFSGLBFAC-UHFFFAOYSA-N 0.000 abstract 2
- 238000012423 maintenance Methods 0.000 abstract 2
- 238000007670 refining Methods 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
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
A process of refining crude acrylonitrile which has been prepared with an aqueous catalyst comprises subjecting the crude acrylonitrile to distillation or steam stripping while maintaining a pH not greater than 3, preferably 1 to 3. Any suitable acid or salt may be used for pH maintenance. The process may be applied to aqueous solutions or to dry or wet acrylonitrile. In the last two cases the pH is measured as 5% aqueous solution. In one example wet crude acrylonitrile containing HCN, acetaldehyde and lactonitrile is continuously acidified to pH 1.5 to 3 (measured as a 5% aqueous solution) with H3PO4 as it is fed to a three-column distillation train; free HCN and acetaldehyde are removed overhead in the first column, water is removed by azeotropic distillation in the second and purified acrylonitrile is distilled from the top of the third column; additional H3PO4 is added to the feed of the last two columns to maintain the pH at 1.5 to 3. Specification 591,945 is referred to.ALSO:A process of refining crude acrylonitrile which has been prepared with an aqueous catalyst comprises subjecting the crude acrylonitrile to distillation or steam stripping while maintaining a pH not greater than 3, preferably 1 to 3. Any suitable acid or salt may be used for pH maintenance. The process may be applied to aqueous solutions or to dry or wet acrylonitrile. In the last two cases the pH is measured as a 5% aqueous solution. In one example wet crude acrylonitrile containing HCN, acetaldehyde and lactonitrile is continuously acidified to pH 1.5 to 3 (measured as a 5% aqueous solution) with H3PO4 as it is fed to a 3-column distillation train; free HCN and acetaldehyde are removed overhead in the first column, water is removed by azeotropic distillation in the second and purified acrylonitrile is distilled from the top of the third column; additional H3PO4 is added to the feed of the last 2 columns to maintain the pH at 1.5 to 3. Specification 591,945 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US834265XA | 1955-10-05 | 1955-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB834265A true GB834265A (en) | 1960-05-04 |
Family
ID=22178243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29527/56A Expired GB834265A (en) | 1955-10-05 | 1956-09-27 | Improvements in or relating to the preparation of acrylonitrile |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB834265A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1288597B (en) * | 1963-01-16 | 1969-02-06 | Knapsack Ag | Process for the production of pure acrylic acid nitrile and pure hydrogen cyanide from crude acrylic acid nitrile |
-
1956
- 1956-09-27 GB GB29527/56A patent/GB834265A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1288597B (en) * | 1963-01-16 | 1969-02-06 | Knapsack Ag | Process for the production of pure acrylic acid nitrile and pure hydrogen cyanide from crude acrylic acid nitrile |
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