Process for preparing urea
US6111138A · kind A · utility
40Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C273/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of urea, in which the gas stream which is released during the synthesis of melamine and is composed essentially of ammonia and carbon dioxide is used to synthesize urea, in which process the gas stream which originates from a high-pressure melamine process and is composed essentially of ammonia and carbon dioxide is condensed at a pressure virtually equal to the pressure in the melamine reactor, in which process substantially anhydrous ammonium carbamate is formed, after which said ammonium carbamate is fed to a high-pressure section of a urea stripping plant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.