GB893052A - Process for the production of urea - Google Patents
Process for the production of ureaInfo
- Publication number
- GB893052A GB893052A GB1698059A GB1698059A GB893052A GB 893052 A GB893052 A GB 893052A GB 1698059 A GB1698059 A GB 1698059A GB 1698059 A GB1698059 A GB 1698059A GB 893052 A GB893052 A GB 893052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ammonium carbamate
- reaction
- temperature
- urea
- ammonia
- 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 introducing ammonium carbamate, which has been prepared by the reaction of NH3 and CO2, with excess ammonia at elevated pressure and temperature into a reaction vessel, a part of the ammonia being taken at a temperature above its critical temperature directly from the reaction mixture leaving the vessel and recirculated partially or entirely into the reaction vessel. The ammonium carbamate may be p produced in a cooled system of pipes to which one or both of the reactants are added stepwise at elevated pressure and temperature in such quantity that the heat of reaction can be removed from the corresponding section of pipe at temperatures above the melting point of the ammonium carbamate. The conversion of the ammonium carbamate to urea is preferably effected at 100-300 atmospheres and 170 DEG C.-200 DEG C., and may take place in a heatable system of pipes. Additional ammonia may be added to the recirculation system to make up losses. Suitable apparatus for the process is described. Specification 844,110 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5971158A CH370762A (en) | 1958-05-20 | 1958-05-20 | Process and apparatus for the production of urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB893052A true GB893052A (en) | 1962-04-04 |
Family
ID=4522504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1698059A Expired GB893052A (en) | 1958-05-20 | 1959-05-19 | Process for the production of urea |
Country Status (6)
| Country | Link |
|---|---|
| CH (1) | CH370762A (en) |
| DE (1) | DE1094730B (en) |
| ES (1) | ES248015A1 (en) |
| FR (1) | FR1224560A (en) |
| GB (1) | GB893052A (en) |
| NL (1) | NL108928C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3544628A (en) * | 1965-09-20 | 1970-12-01 | Pullman Inc | Urea synthesis |
| YU34282B (en) * | 1967-12-14 | 1979-04-30 | Snam Progetti | Process for the decomposition and recyclation of unreacted ammonium carbamate into the reactor for the synthesis of carbamide |
-
0
- NL NL108928D patent/NL108928C/xx active
-
1958
- 1958-05-20 CH CH5971158A patent/CH370762A/en unknown
-
1959
- 1959-03-20 ES ES0248015A patent/ES248015A1/en not_active Expired
- 1959-04-10 DE DEI16266A patent/DE1094730B/en active Pending
- 1959-05-15 FR FR794796A patent/FR1224560A/en not_active Expired
- 1959-05-19 GB GB1698059A patent/GB893052A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL108928C (en) | |
| CH370762A (en) | 1963-07-31 |
| DE1094730B (en) | 1960-12-15 |
| FR1224560A (en) | 1960-06-24 |
| ES248015A1 (en) | 1959-09-01 |
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