Method for the preparation of melamine
US6258950A · kind A · utility
4Cited by
5References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Jan 28, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D251/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a high-pressure process for producing melamine from urea in which highly pure melamine is obtained by transferring melamine melt leaving a melamine reactor to a cooling vessel where the melamine melt is cooled to a temperature of between 1.degree. C. and 30.degree. C. above the melting point of melamine after which the liquid melamine can be transferred to a second cooling vessel in which vessel the melamine melt is further cooled using cold ammonia by which solid melamine is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.