GB145060A - Improvements in the manufacture and production of urea - Google Patents
Improvements in the manufacture and production of ureaInfo
- Publication number
- GB145060A GB145060A GB16211/20A GB1621120A GB145060A GB 145060 A GB145060 A GB 145060A GB 16211/20 A GB16211/20 A GB 16211/20A GB 1621120 A GB1621120 A GB 1621120A GB 145060 A GB145060 A GB 145060A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- ammonia
- carbon dioxide
- autoclave
- melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
- C07C273/04—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds from carbon dioxide and ammonia
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Urea is prepared by forcing a mixture of carbon dioxide and ammonia into an autoclave and maintaining the melt formed for a sufficient time at the temperature required for the transformation of ammonium carbamate into urea. The process is carried out in a continuous manner by forcing the gases into the autoclave and keeping the melt at 135 DEG C. for two hours, then slowly releasing the reaction mass through a bottom valve to a column still in which it is distilled, urea solution running off from the bottom of the still, while unchanged ammonia and carbon dioxide pass off to a dephlegmator and thence back to the compressor. More ammonia and carbon dioxide are supplied to the autoclave, or an aqueous solution of ammonium carbamate or carbonate is supplied to the top of the column still. The amount of moisture in the gases led back to the compressor may be controlled by keeping the temperature at the outlet of the p dephlegmator at, say, 60 DEG C. The expansion of the melt may be allowed to take place in two stages to save compression energy. The Specification as open to inspection under Sect. 91 (3) (a) refers also to the production of urea from ammonia and carbon dioxide otherwise than by the continuous process described. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE145060X | 1916-08-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB145060A true GB145060A (en) | 1921-05-19 |
Family
ID=5670562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16211/20A Expired GB145060A (en) | 1916-08-09 | 1920-06-15 | Improvements in the manufacture and production of urea |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE301279C (en) |
GB (1) | GB145060A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406200A (en) * | 1959-12-31 | 1968-10-15 | Montedison Spa | Urea manufacture |
-
0
- DE DENDAT301279D patent/DE301279C/de active Active
-
1920
- 1920-06-15 GB GB16211/20A patent/GB145060A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406200A (en) * | 1959-12-31 | 1968-10-15 | Montedison Spa | Urea manufacture |
Also Published As
Publication number | Publication date |
---|---|
DE301279C (en) |
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