Process and plant for urea production with reaction spaces having differentiated yields
US6287525A · kind A · utility
3Cited by
10References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1997 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/141
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for urea production, substantially pure ammonia and carbon dioxide are reacted in a main reaction space from which outgoes a reaction mixture subjected to stripping to obtain a partially purified mixture sent to a urea recovery section. From this section, a dilute carbamate solution is obtained which is recycled to an auxiliary reaction space in which the residual carbamate is converted into urea. This process achieves high average conversion yield with reduced energy consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.