Method for producing pure melamine
US7741481B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2005 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Apr 18, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D251/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for producing pure melamine by preparing a melamine melt, which is obtained in a high pressure process and from which the reaction gases are removed. Said method is characterized in that the melamine melt is quenched by water with a purity in excess of 95 wt. %, that NH3 and CO2 are subsequently removed from the obtained melamine solution and that alkali is added to said melamine solution and the mixture is then left to rest, whereby pure melamine is obtained by crystallization. Thus a melamine can be obtained with the same quality as that produced in known comparative methods, using smaller quantities of alkali.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.