GB598533A - Improvements in or relating to process for the production of melamine - Google Patents
Improvements in or relating to process for the production of melamineInfo
- Publication number
- GB598533A GB598533A GB11138/43A GB1113843A GB598533A GB 598533 A GB598533 A GB 598533A GB 11138/43 A GB11138/43 A GB 11138/43A GB 1113843 A GB1113843 A GB 1113843A GB 598533 A GB598533 A GB 598533A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melamine
- dicyandiamide
- liquid ammonia
- ammonia
- reaction
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Melamine is produced by a cyclic process in which dicyandiamide, cyanamide, or a mixture thereof in solution in liquid ammonia is heated for 10 to 60 minutes at 110 to 160 DEG C. under sufficient pressure to maintain the liquid phase and prevent substantial vaporization of ammonia, whereupon the reaction mixture is cooled, the precipitated melamine is removed and the mother liquor is recycled with or without additional quantities of dicyandiamide and liquid ammonia. The dicyandiamide is preferably dissolved in the liquid ammonia at about 20-70 DEG C. and may comprise 25-70 per cent of the whole. In order to reduce the amount of deamination products formed in the reaction, not more than about one half of the dicyandiamine is converted to melamine during the reaction period. The relatively insoluble melamine is filtered from the cooled reactants which contain the more soluble dicyandiamide and intermediate products in solution. The process may be carried out in the apparatus of Specification 598,532.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US598533XA | 1942-06-06 | 1942-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB598533A true GB598533A (en) | 1948-02-20 |
Family
ID=22025694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11138/43A Expired GB598533A (en) | 1942-06-06 | 1943-07-13 | Improvements in or relating to process for the production of melamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB598533A (en) |
-
1943
- 1943-07-13 GB GB11138/43A patent/GB598533A/en not_active Expired
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