Method of stripping unreacted materials in urea synthesis process
US4321410A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 3, 1981 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Mar 3, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C273/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process in which a urea synthesis effluent obtained by reacting ammonia with carbon dioxide is subjected to a stripping step of bringing the urea synthesis effluent into countercurrent contact with carbon dioxide under heating to obtain an aqueous urea solution containing a small amount of ammonia and ammonium carbamate, the improvement comprises first bringing the urea synthesis effluent is into contact with a separated gas evolved in the stripping step under adiabatic conditions or with a little cooling. The use of the above process enables a reduction in size of the stripper and a recovery of the high pressure steam without keeping the ammonia to carbon dioxide molar ratio lower than that of the conventional method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.