GB1586624A - Method for the production of ammonium carbamate solution and method for the production of urea and ammonia - Google Patents
Method for the production of ammonium carbamate solution and method for the production of urea and ammonia Download PDFInfo
- Publication number
- GB1586624A GB1586624A GB7962/78A GB796278A GB1586624A GB 1586624 A GB1586624 A GB 1586624A GB 7962/78 A GB7962/78 A GB 7962/78A GB 796278 A GB796278 A GB 796278A GB 1586624 A GB1586624 A GB 1586624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ammonia
- solution
- absorber
- urea
- production
- 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
- C07C273/10—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 combined with the synthesis of ammonia
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0488—Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
-
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
In a process of the so-called integrated type for the production of ammonia and urea, the absorption of CO2 from the crude gases passing to the ammonia synthesis reactor is effected by means of an absorption apparatus which is divided into two sections, one of which is of the type with adiabatic plates (6) and the other is of the type with a thin-film tube bundle (9). Most of the CO2 is removed in the thin-film absorber, and the remainder in the adiabatic plate absorber. <IMAGE>
Description
(54) METHOD FOR THE PRODUCTION OF
AMMONIUM CARBAMATE SOLUTION, AND
METHOD FOR THE PRODUCTION OF UREA AND AMMONIA
(71) We, SNAMPROGETTI S.p.A, an
Italian Company, of Corso Venezia 16, Milan,
ITALY, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a method for the absorption of carbon dioxide in aqueous ammonia solution to produce an ammonium carbamate solution, and to a method for the concurrent production of urea and ammonia.
It is known from British Patent Specification No.1,359,715 that the absorption of CO2 con- tained in raw gases for the synthesis of ammonia in an aqueous ammonia solution to form an ammonium carbamate solution can be carried out in a film-exchanger, the aqueous ammonia solution being fed to the exchanger both at the bottom and at the top thereof. However, during the absorption, evaporation of about 20% of the ammonia takes place, so that such ammonia must be partially condensed and fed back to the absorber. The remainder of the ammonia contained in the gases emerging from the absorber is sent, after the partial condensation described, to an ammonia-absorber wherein such ammonia, along with ammonia from the ammonia-synthesis apparatus, is absorbed in water. This process is complicated and requires considerable expenditure on equipment.
According to the present invention, there is provided a method for the absorption of carbon dioxide in aqueous ammonia solution to produce an ammonium carbamate solution, wherein the absorption is carried out by introducing the carbon dioxide at or near the bottom of an absorber which is divided into two sections the lower of which is a film-absorber, the absorbing solution in the upper section being the aqueous ammonia solution (with or without the presence therein of liquid ammonia) and the absorbing solution in the lower section being an aqueous ammoniacal solution of ammonium carbonate.
The invention also provides a modification of the above method, wherein the film-absorber and the plate-absorber are arranged serially and non-superposedly; and wherein the carbon dioxide is fed into the film-absorber at or near the bottom thereof, is then discharged from the top of the film-absorber and is then fed into the plate-absorber at or near the bottom thereof.
The present invention also provides a method for the concurrent production of ammonia and urea, comprising the steps of: (a) producing ammonia in an ammonia-synthesis reactor; (b) absorbing ammonia at the exit of the ammonia-synthesis reactor with water, thus obtaining a concentrated aqueous solution of ammonia; (c) utilizing the concentrated solution of ammonia for the absorption of CO2 contained in a raw gas for the synthesis of ammonia, thereby obtaining ammonium carbamate; (d) converting the ammonium carbamate partially into urea in a urea-synthesis reactor; (e) thermally decomposing the carbamate which has not been converted into urea and stripping the decomposition products with a gas selected from ammonia, CO2 and inert gas; (f) discharging from the stripping zone a solution of urea which still contains carbamate;(g) recycling the products of decomposition of the carbamate to the urea-synthesis reactor; and (h) distilling, under a pressure of from 3 to 30 atmospheres and in one or more stages, the solution of urea to obtain (i) liquid ammonia and one or more ammoniacal solutions of ammonium carbanate, and (ii) an aqueous solution of urea deprived of ammonium carbamate; wherein the absorption of CO2 in step (c) is carried out by introducing the raw gas at or near the bottom of an absorber which is split into two sections, the lower section being a film-absorber and the upper section being a plate-absorber, the absorbing solution in the
(1) Ammonia solution (temperature 500) from 3:
NH3 . . 12,684 kg/hr (80% by weight)
H2O . . . 3,172 do. (20% do. );
(2) recycled anhydrous ammonia, at a temperature of 380C, from 7: 35,874 kg/hr.
From the bottom of the plate-absorber 6, the following solution emerged via 8 at a temperature of 117 C: NH3 . . 45,939 kg/hr (82.20% by weight)
CO2. . . 6,778 do. (12.13% do. )
H2O . . . 3,172 do. (5.67% do. ) Total 55,889 do. (100.00% do. ).
This solution was sent to the urea-synthesis reactor.
From the top of the plate-absorber 6, the following CO2 -stri,pped gas emerged via 9 at a temperature of 43 C:
Ar 215 normal m3/hr (0.25%byvolume) H2 . . 55,425 do. (63.44% do. )
N2 . . 18,161 do. (20.79% do. ) CH4. . . 251 do. (0.29% do. ) CO . . . . . 390 do. (0.45% do. )
NH3 . . 12,918 do. (14.78% do.. )
Total 87,360 do. (100.00% do. ) This gas was subjected to methanization.
WHAT WE CLAIM IS:
1. A method for the concurrent production of ammonia and urea, comprising the steps of: (a) producing ammonia in an ammoniasynthesis reactor; (b) absorbing ammonia at the exit of the ammonia-synthesis reactor with water, thus obtaining a concentrated aqueous solution of ammonia; (c) utilizing the concentrated solution of ammonia for the absorption of CO2 contained in a raw gas for the synthesis of ammonia, thereby obtaining ammonium carbamate; (d) converting the ammonium carbamate partially into urea in a urea-synthesis reactor; (e) thermally decomposing the carbamate which has not been converted into urea and stripping the decomposition products with a gas selected from ammonia, CO2 and inert gas; (f) discharging from the stripping zone a solution of urea which still contains carbamate; (g) recycling the products of decomposition of the carbamate to the urea-synthesis reactor, and (h) distilling, under a pressure of from 3 to 30 atmospheres and in one or more stages, the solution of urea to obtain (i) liquid ammonia and one or more ammoniacal solutions of ammonium carbonate, and (ii) an aqueous soluof urea deprived of ammonium carbamate; wherein the absorption of CO2 in step (c) is carried out by introducing the raw gas at or near the bottom of an absorber which is split into two sections, the lower section being a film-absorber and the upper section being a plate-absorber, the absorbing solution in the upper section being said concentrated aqueous solution of ammonia (with or without the addition of liquid ammonia thereto), and the absorbing solution in the lower section being one or more of said aqueous ammoniacal solutions of ammonium carbonate obtained by dis tillation of the solution of ureaunder a pressure of from 3 to 30 atmospheres.
2. A method according two claim 1, wherein, in the absorbing solution in the upper section, the weight ratio of the liquid ammonia to said concentrated aqueous solution of ammonia is from 1:1 to 1:5.
3. A modification of a method according to claim 1 or 2, wherein the film-absorber and the plate-absorber are arranged serially and nonsuperposedly. wherein the raw gas which contains CO2 is fed into the film-absorber at or near the bottom thereof, is then discharged from the top of the film-absorber and is then fed into the plate-absorber at or near the bottom thereof; wherein the absorbing solution for the film-absorber is fed into such section at or near the top thereof; and wherein the absorbing solution for the plate-absorber is fed into such section at or near the top thereof.
4. A method for the concurrent production of ammonia and urea, substantially as hereinbefore described with reference to the accompanying drawing.
5. Ammonia whenever produced by the method according to any of claims 1 to 4.
6. Urea whenever produced by the method according to any of claims 1 to 4.
7. A method for the absorption of carbon dioxide in aqueous ammonia solution to produce an ammonium carbamate solution, wherein the absorption is carried out by introducing the carbon dioxide at or near the bottom of an absorber which is divided into two sections the lower of which is a film-absorber and the upper of which is a plate-absorber, the absorbing solution in the upper section being the aqueous ammonia solution (with or without the presence therein of liquid ammonia) and the absorbing solution in the lower section being an aqueous ammoniacal solution of ammonium carbonate.
8. A modification of a method according to claim 7, wherein the film-absorber and the plate-absorber are arranged serially and nonsuperposedly; and wherein the carbon dioxide is fed into the film-absorber at or near the bottom thereof is then discharged from the top of the film-absorber and is then fed into the plateabsorber at or near the bottom thereof.
9. A method for the absorption of carbon dioxide in aqueous ammonia solution to produce an ammonium carbamate solution, substantially as hereinbefore described with reference to the accompanying drawings.
10. An ammonium carbamate solution whenever produced by the method according to
Claims (1)
- claim 7, 8 or 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20850/77A IT1115610B (en) | 1977-03-03 | 1977-03-03 | INTEGRATED UREA-AMMONIA PROCEDURE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1586624A true GB1586624A (en) | 1981-03-25 |
Family
ID=11172995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7962/78A Expired GB1586624A (en) | 1977-03-03 | 1978-02-28 | Method for the production of ammonium carbamate solution and method for the production of urea and ammonia |
Country Status (21)
| Country | Link |
|---|---|
| JP (1) | JPS53108926A (en) |
| AR (1) | AR221480A1 (en) |
| AU (1) | AU515786B2 (en) |
| BE (1) | BE864554A (en) |
| BR (1) | BR7801343A (en) |
| CA (1) | CA1118185A (en) |
| CH (1) | CH639353A5 (en) |
| CS (1) | CS219889B2 (en) |
| DD (1) | DD134087A5 (en) |
| DE (1) | DE2808831C3 (en) |
| DK (1) | DK92978A (en) |
| ES (1) | ES468020A1 (en) |
| FR (1) | FR2382403B1 (en) |
| GB (1) | GB1586624A (en) |
| IE (1) | IE46473B1 (en) |
| IT (1) | IT1115610B (en) |
| LU (1) | LU79147A1 (en) |
| NL (1) | NL7802158A (en) |
| PL (1) | PL110971B1 (en) |
| SE (1) | SE7802450L (en) |
| TR (1) | TR19994A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154024A (en) * | 2018-04-06 | 2020-12-29 | 索理思科技公司 | System and method for forming a specific solution of ammonium carbamate |
| TWI841557B (en) | 2018-04-06 | 2024-05-11 | 美商索雷尼斯科技公司 | Systems and methods for forming a speciated solution of ammonium carbamate |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9598286B2 (en) * | 2012-07-13 | 2017-03-21 | Seerstone Llc | Methods and systems for forming ammonia and solid carbon products |
| PL413125A1 (en) | 2015-07-14 | 2017-01-16 | Vts Spółka Z Ograniczoną Odpowiedzialnością | Hinge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1034674B (en) * | 1975-03-28 | 1979-10-10 | Snam Progetti | FLEXIBLE INTERGRATED PROCESS FOR THE PRODUCTION OF EDUREA AMMONIA |
-
1977
- 1977-03-03 IT IT20850/77A patent/IT1115610B/en active
-
1978
- 1978-02-17 AU AU33388/78A patent/AU515786B2/en not_active Expired
- 1978-02-24 ES ES468020A patent/ES468020A1/en not_active Expired
- 1978-02-27 CH CH210478A patent/CH639353A5/en not_active IP Right Cessation
- 1978-02-27 NL NL7802158A patent/NL7802158A/en not_active Application Discontinuation
- 1978-02-28 TR TR19994A patent/TR19994A/en unknown
- 1978-02-28 GB GB7962/78A patent/GB1586624A/en not_active Expired
- 1978-02-28 AR AR271265A patent/AR221480A1/en active
- 1978-03-01 DE DE2808831A patent/DE2808831C3/en not_active Expired
- 1978-03-01 LU LU79147A patent/LU79147A1/en unknown
- 1978-03-01 DK DK92978A patent/DK92978A/en not_active Application Discontinuation
- 1978-03-01 JP JP2215778A patent/JPS53108926A/en active Granted
- 1978-03-01 FR FR7805902A patent/FR2382403B1/fr not_active Expired
- 1978-03-01 DD DD78203911A patent/DD134087A5/en unknown
- 1978-03-02 CA CA000298107A patent/CA1118185A/en not_active Expired
- 1978-03-02 PL PL1978205024A patent/PL110971B1/en unknown
- 1978-03-03 CS CS781366A patent/CS219889B2/en unknown
- 1978-03-03 SE SE7802450A patent/SE7802450L/en unknown
- 1978-03-03 BR BR7801343A patent/BR7801343A/en unknown
- 1978-03-03 IE IE448/78A patent/IE46473B1/en unknown
- 1978-03-09 BE BE185665A patent/BE864554A/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154024A (en) * | 2018-04-06 | 2020-12-29 | 索理思科技公司 | System and method for forming a specific solution of ammonium carbamate |
| TWI841557B (en) | 2018-04-06 | 2024-05-11 | 美商索雷尼斯科技公司 | Systems and methods for forming a speciated solution of ammonium carbamate |
Also Published As
| Publication number | Publication date |
|---|---|
| BE864554A (en) | 1978-09-04 |
| SE7802450L (en) | 1978-09-04 |
| DD134087A5 (en) | 1979-02-07 |
| FR2382403A1 (en) | 1978-09-29 |
| DK92978A (en) | 1978-09-04 |
| PL110971B1 (en) | 1980-08-30 |
| JPS6324986B2 (en) | 1988-05-23 |
| IT1115610B (en) | 1986-02-03 |
| CA1118185A (en) | 1982-02-16 |
| AU3338878A (en) | 1979-08-23 |
| LU79147A1 (en) | 1978-06-27 |
| AU515786B2 (en) | 1981-04-30 |
| DE2808831C3 (en) | 1981-04-16 |
| AR221480A1 (en) | 1981-02-13 |
| CS219889B2 (en) | 1983-03-25 |
| TR19994A (en) | 1980-07-01 |
| IE46473B1 (en) | 1983-06-29 |
| NL7802158A (en) | 1978-09-05 |
| ES468020A1 (en) | 1978-12-01 |
| DE2808831A1 (en) | 1978-09-07 |
| BR7801343A (en) | 1978-12-12 |
| IE780448L (en) | 1978-09-03 |
| PL205024A1 (en) | 1979-03-26 |
| JPS53108926A (en) | 1978-09-22 |
| FR2382403B1 (en) | 1981-10-23 |
| CH639353A5 (en) | 1983-11-15 |
| DE2808831B2 (en) | 1980-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |