Process for the production of high purity melamine from urea
US6858730B2 · kind B2 · utility
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2References
15Claims
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Key dates
| Filing date | Sep 6, 2001 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Sep 6, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D251/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for purifying melamine comprising impurities like ureido-melamine, oxotriazines, melam, melem, comprises the step of putting into contact at a temperature comprised between 340° C. and 410° C. and at a pressure comprised between 8 and 17 MPa a melamine melt with a bed of a catalyst thus obtaininig melamine with a purity of at least 99%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.