IT1038067B - Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution - Google Patents
Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollutionInfo
- Publication number
- IT1038067B IT1038067B IT2332475A IT2332475A IT1038067B IT 1038067 B IT1038067 B IT 1038067B IT 2332475 A IT2332475 A IT 2332475A IT 2332475 A IT2332475 A IT 2332475A IT 1038067 B IT1038067 B IT 1038067B
- Authority
- IT
- Italy
- Prior art keywords
- urea
- pref
- condensate
- vapours
- water
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Urea prepn. from CO2 and NH3 under pressure is by passing the prod. through several NH4 carbamate decompsn stages with gradual reduction of pressure to decompose and separate unreacted NH4 carbamate, them contg. the urea soln., pref. at 60-200 mm Hg pressure. The exit vapours from the concn. stage contg. water, entrained urea, NH3 and CO2 are sepd. to form a 1st condensate of urea, CO2 and NH3, and a 2nd condensate contg. the rest of the CO2 and NH3. The 2nd condensate is distilled to recover CO2 and NH3 gas and water. A pre-condensation may pref. be carried out before the 1st condensation stage by indirect cooling. The 2nd condensation is pref. carried out in two stages. The 1st condensate is pref. used as a water wash in the urea process, partic. for the exit dust from the urea pastille formation stage, which is thereafter passed through a resinous filter. Loss of urea and water pollution are avoided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2332475A IT1038067B (en) | 1975-05-14 | 1975-05-14 | Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2332475A IT1038067B (en) | 1975-05-14 | 1975-05-14 | Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1038067B true IT1038067B (en) | 1979-11-20 |
Family
ID=11206070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT2332475A IT1038067B (en) | 1975-05-14 | 1975-05-14 | Urea synthesis from carbon dioxide and ammonia - recovers urea from vapours of urea concentration stage to avoid pollution |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1038067B (en) |
-
1975
- 1975-05-14 IT IT2332475A patent/IT1038067B/en active
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