Method for the production of melamine
US6870050B2 · kind B2 · utility
3Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2001 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Jul 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D251/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH3 to give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled to a temperature which is 1-50° C., preferably 1-30° C., above the melting point of the melamine, which is dependent on the prevailing NH3 pressure. Introduction of NH3 in countercurrent drives out the CO2 formed, after which the melamine melt is worked up in any appropriate way.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.