ES358855A1 - Process for the Production of Urea having a Low Carbamate Content - Google Patents
Process for the Production of Urea having a Low Carbamate ContentInfo
- Publication number
- ES358855A1 ES358855A1 ES358855A ES358855A ES358855A1 ES 358855 A1 ES358855 A1 ES 358855A1 ES 358855 A ES358855 A ES 358855A ES 358855 A ES358855 A ES 358855A ES 358855 A1 ES358855 A1 ES 358855A1
- Authority
- ES
- Spain
- Prior art keywords
- excess
- urea
- solution
- synthesis zone
- gaseous
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/04—Electrodes; Screens
- H01J17/06—Cathodes
- H01J17/066—Cold cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)
- H01J2893/0065—Electrode systems
- H01J2893/0066—Construction, material, support, protection and temperature regulation of electrodes; Electrode cups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Urea production comprises feeding gaseous CO 2 and an excess of liquid or gaseous NH 3 to a synthesis zone in a reactor, reacting the CO 2 and NH 3 therein so as to produce, as the reaction product, a solution of urea contaminated with ammonium carbamate and containing the excess NH 3 , causing or allowing the said solution to flow as a thin film over a surface in a decomposition chamber in which the temperature and pressure are substantially the same, heated to an extent sufficient to cause at least part of the ammonium carbamate to decompose into gaseous CO 2 and NH 3 , recycling the decomposition products as well as the excess NH 3 to the synthesis zone, and recovering the urea solution having a reduced ammonium carbamate content. The thin liquid film may be obtained, e.g. by allowing the reaction product to drop along the inside wall of a heat exchanger or along the wall of part of the reactor other than the synthesis zone. Synthesis and decomposition may be effected at a temperature of 180- 350 C. and pressure of 100-300 atm. The presence of NH 3 excess and consequent dissolved NH 3 in the solution from the synthesis zone is essential and the usual NH 3 /CO 2 ratio is from 2À3:1 to 5À5:1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2102767 | 1967-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES358855A1 true ES358855A1 (en) | 1970-05-16 |
Family
ID=11175595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES358855A Expired ES358855A1 (en) | 1967-09-29 | 1968-09-25 | Process for the Production of Urea having a Low Carbamate Content |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5432767B1 (en) |
| AT (1) | AT290545B (en) |
| BE (1) | BE719035A (en) |
| CH (1) | CH487855A (en) |
| CS (1) | CS155191B2 (en) |
| DE (1) | DE1768776B2 (en) |
| DK (1) | DK118396B (en) |
| ES (1) | ES358855A1 (en) |
| FR (1) | FR1576811A (en) |
| GB (1) | GB1184004A (en) |
| IE (1) | IE32209B1 (en) |
| LU (1) | LU56630A1 (en) |
| NL (1) | NL161137C (en) |
| NO (1) | NO145949C (en) |
| SE (1) | SE373574B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL174548C (en) * | 1977-05-05 | 1988-05-16 | Montedison Spa | PROCESS FOR PREPARING UREA BY REACTION OF AMMONIA AND CARBON DIOXIDE. |
| NL7713190A (en) * | 1977-11-30 | 1979-06-01 | Unie Van Kunstmestfab Bv | METHOD AND DEVICE FOR THE REMOVAL OF AMMONIUM CARBAMATE FROM A UREEA SYNTHESIS SOLUTION. |
| IT1209532B (en) * | 1984-04-20 | 1989-08-30 | Snam Progetti | PROCESS FOR THE SYNTHESIS OF UREA AND MATERIAL USED IN ITSELF. |
| IN169678B (en) * | 1987-08-13 | 1991-11-30 | Austral Pacific Fertilizers | |
| IT1274362B (en) | 1995-02-16 | 1997-07-17 | Snam Progetti | HIGH YIELD PROCEDURE FOR THE SYNTHESIS OF UREA |
| ITMI20120013A1 (en) | 2012-01-09 | 2013-07-10 | Saipem Spa | PROCEDURE FOR THE SYNTHESIS OF UREA INCLUDING A STRIPPER FUND OF PASSIVATION |
| AU2022420708A1 (en) | 2021-12-20 | 2024-07-04 | Stamicarbon B.V. | Thermal stripping urea production |
-
1968
- 1968-06-21 AT AT598768A patent/AT290545B/en not_active IP Right Cessation
- 1968-06-21 DK DK296968AA patent/DK118396B/en unknown
- 1968-06-21 NO NO2461/68A patent/NO145949C/en unknown
- 1968-06-25 NL NL6808895.A patent/NL161137C/en not_active IP Right Cessation
- 1968-06-27 GB GB30814/68A patent/GB1184004A/en not_active Expired
- 1968-06-28 SE SE6808922A patent/SE373574B/en unknown
- 1968-06-28 DE DE19681768776 patent/DE1768776B2/en not_active Ceased
- 1968-07-08 JP JP4720368A patent/JPS5432767B1/ja active Pending
- 1968-07-25 IE IE894/68A patent/IE32209B1/en unknown
- 1968-08-01 LU LU56630D patent/LU56630A1/xx unknown
- 1968-08-02 FR FR1576811D patent/FR1576811A/fr not_active Expired
- 1968-08-02 BE BE719035D patent/BE719035A/xx not_active IP Right Cessation
- 1968-08-03 CH CH1166268A patent/CH487855A/en not_active IP Right Cessation
- 1968-09-16 CS CS686495A patent/CS155191B2/en unknown
- 1968-09-25 ES ES358855A patent/ES358855A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NO145949C (en) | 1982-06-30 |
| CH487855A (en) | 1970-03-31 |
| IE32209B1 (en) | 1973-05-16 |
| CS155191B2 (en) | 1974-05-30 |
| BE719035A (en) | 1969-01-16 |
| NL6808895A (en) | 1969-04-01 |
| LU56630A1 (en) | 1968-11-14 |
| DK118396B (en) | 1970-08-17 |
| DE1768776A1 (en) | 1971-09-16 |
| SE373574B (en) | 1975-02-10 |
| NO145949B (en) | 1982-03-22 |
| IE32209L (en) | 1969-03-29 |
| JPS5432767B1 (en) | 1979-10-16 |
| GB1184004A (en) | 1970-03-11 |
| NL161137B (en) | 1979-08-15 |
| FR1576811A (en) | 1969-08-01 |
| DE1768776B2 (en) | 1973-05-03 |
| NL161137C (en) | 1980-01-15 |
| AT290545B (en) | 1971-06-11 |
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