GB1423977A - Urea synthesis with heat recovery and ammonium carbamate recirculation - Google Patents
Urea synthesis with heat recovery and ammonium carbamate recirculationInfo
- Publication number
- GB1423977A GB1423977A GB2138474A GB2138474A GB1423977A GB 1423977 A GB1423977 A GB 1423977A GB 2138474 A GB2138474 A GB 2138474A GB 2138474 A GB2138474 A GB 2138474A GB 1423977 A GB1423977 A GB 1423977A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- ammonia
- carbon dioxide
- carbamate
- water
- 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
1423977 Urea I MAVROVIC 14 May 1974 [13 June 1973] 21384/74 Heading C2C Urea is synthesized from ammonia and carbon dioxide in a process in which a first aqueous urea solution comprising urea, ammonium carbonate, ammonia and water is produced at elevated temperature and pressure, the process comprising (a) reducing the pressure and heating the first aqueous urea solution in a first carbamate decomposing zone to decompose from 10 to 60% by weight of the ammonium carbamate therein to ammonia and carbon dioxide, (b) heating the first aqueous urea solution in a second carbamate decomposing zone to decompose additional ammonium carbamate to ammonia and carbon dioxide and to produce a liquid phase comprising urea, water, residual ammonium carbamate and residual excess ammonia, and a gaseous phase comprising carbon dioxide, ammonia and water, (c) separating the gaseous phase and the liquid phase, and (d) contacting this gaseous phase, urea and fresh carbon dioxide to form ammonium carbonate in indirect heat exchange with the first aqueous urea solution, the quantity of urea so contacted being such that the reaction product has a urea to water weight ratio of 0À1 : 1 to 1À6 : 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US369756A US3886210A (en) | 1970-06-29 | 1973-06-13 | Urea synthesis with improved heat recovery and ammonium carbamate recirculation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1423977A true GB1423977A (en) | 1976-02-04 |
Family
ID=23456789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2138474A Expired GB1423977A (en) | 1973-06-13 | 1974-05-14 | Urea synthesis with heat recovery and ammonium carbamate recirculation |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS585189B2 (en) |
| AR (1) | AR200786A1 (en) |
| BE (1) | BE816142A (en) |
| BR (1) | BR7404845D0 (en) |
| CA (1) | CA1026374A (en) |
| DE (1) | DE2425581A1 (en) |
| ES (1) | ES426986A1 (en) |
| FR (2) | FR2244755B1 (en) |
| GB (1) | GB1423977A (en) |
| IN (1) | IN140206B (en) |
| IT (1) | IT1015048B (en) |
| NL (1) | NL182219C (en) |
| TR (1) | TR18243A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113557404B (en) | 2019-03-18 | 2023-06-20 | 三菱电机株式会社 | Plate heat exchanger and heat pump device provided with same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5189A (en) * | 1974-06-20 | 1976-01-05 | Sakuhei Fujita | Magaripaipuniokeru anaakehoho |
-
1974
- 1974-05-08 IN IN1025/CAL/74A patent/IN140206B/en unknown
- 1974-05-14 GB GB2138474A patent/GB1423977A/en not_active Expired
- 1974-05-27 DE DE19742425581 patent/DE2425581A1/en active Pending
- 1974-06-04 TR TR18243A patent/TR18243A/en unknown
- 1974-06-05 ES ES426986A patent/ES426986A1/en not_active Expired
- 1974-06-05 AR AR254068A patent/AR200786A1/en active
- 1974-06-10 BE BE145264A patent/BE816142A/en unknown
- 1974-06-10 CA CA202,018A patent/CA1026374A/en not_active Expired
- 1974-06-12 FR FR7420858A patent/FR2244755B1/fr not_active Expired
- 1974-06-12 IT IT23954/74A patent/IT1015048B/en active
- 1974-06-12 JP JP49066136A patent/JPS585189B2/en not_active Expired
- 1974-06-12 BR BR4845/74A patent/BR7404845D0/en unknown
- 1974-06-12 NL NLAANVRAGE7407873,A patent/NL182219C/en not_active IP Right Cessation
-
1975
- 1975-02-19 FR FR7505586A patent/FR2272984B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1015048B (en) | 1977-05-10 |
| JPS5035115A (en) | 1975-04-03 |
| DE2425581A1 (en) | 1975-01-09 |
| NL182219C (en) | 1988-02-01 |
| AR200786A1 (en) | 1974-12-13 |
| FR2244755B1 (en) | 1977-10-07 |
| NL182219B (en) | 1987-09-01 |
| BR7404845D0 (en) | 1975-09-30 |
| NL7407873A (en) | 1974-12-17 |
| CA1026374A (en) | 1978-02-14 |
| BE816142A (en) | 1974-12-10 |
| FR2244755A1 (en) | 1975-04-18 |
| TR18243A (en) | 1976-11-10 |
| JPS585189B2 (en) | 1983-01-29 |
| IN140206B (en) | 1976-09-25 |
| FR2272984A1 (en) | 1975-12-26 |
| FR2272984B1 (en) | 1979-07-13 |
| ES426986A1 (en) | 1976-09-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |