GB710973A - Improvements in the production of acrylo-nitrile - Google Patents
Improvements in the production of acrylo-nitrileInfo
- Publication number
- GB710973A GB710973A GB658/52A GB65852A GB710973A GB 710973 A GB710973 A GB 710973A GB 658/52 A GB658/52 A GB 658/52A GB 65852 A GB65852 A GB 65852A GB 710973 A GB710973 A GB 710973A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphoric acid
- catalyst
- reaction
- nitrogen
- ammonia
- 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
- C07C253/22—Preparation of carboxylic acid nitriles by reaction of ammonia with carboxylic acids with replacement of carboxyl groups by cyano groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Acrylonitrile is obtained by leading acrylic acid and ammonia in the gas phase at elevated temperature over a dehydration catalyst containing phosphoric acid or a phosphate. The reaction temperature is preferably above 200 DEG C., the preferred range being between 250 DEG and 500 DEG C. Specified dehydration catalysts are free phosphoric acid, and acid and/or neutral alkali, alkaline earth, ammonium, beryllium, aluminium, boron, and titanium phosphates, also mixtures of phosphates and free phosphoric acid. The phosphoric acid and/or phosphates may be used alone or on carriers such as silica gel, pumice, coke, or other porous materials. The acrylic acid and ammonia led into the tube, advantageously in about stoichiometric proportions, are preferably separately preheated to the reaction temperature before they meet within the catalyst filling and it is also preferable to pass a weak current of inert gas, e.g. nitrogen, hydrogen or carbon monoxide through the tube and/or to apply a vacuum to the lower end of the tube. The reaction may also be carried out in the presence of inert liquids, e.g. aromatic hydrocarbons or water. The process may be carried out continuously or discontinuously and the reaction products which have not condensed at room temperature together with the diluent or carrier gas may be returned to the reaction chamber as recycle gas. Examples are given in which the catalyst is phosphoric acid on silica gel, nitrogen being used as carrier gas in each case. In one of the examples the acrylic acid is employed as an 80 per cent aqueous solution which is led over the catalyst at 350 DEG C., together with ammonia and nitrogen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE710973X | 1951-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB710973A true GB710973A (en) | 1954-06-23 |
Family
ID=6619746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB658/52A Expired GB710973A (en) | 1951-01-09 | 1952-01-09 | Improvements in the production of acrylo-nitrile |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB710973A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0749956A1 (en) * | 1995-06-21 | 1996-12-27 | Hüls Aktiengesellschaft | Process for the preparation of 2-hydroxybenzonitrile |
-
1952
- 1952-01-09 GB GB658/52A patent/GB710973A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0749956A1 (en) * | 1995-06-21 | 1996-12-27 | Hüls Aktiengesellschaft | Process for the preparation of 2-hydroxybenzonitrile |
| US6248917B1 (en) | 1995-06-21 | 2001-06-19 | Huels Aktiengesellschaft | Process for the preparation of 2-hydroxybenzonitrile |
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