CU21712A3 - PROCEDURE FOR THE PREPARATION OF UREA - Google Patents
PROCEDURE FOR THE PREPARATION OF UREAInfo
- Publication number
- CU21712A3 CU21712A3 CU36231A CU36231A CU21712A3 CU 21712 A3 CU21712 A3 CU 21712A3 CU 36231 A CU36231 A CU 36231A CU 36231 A CU36231 A CU 36231A CU 21712 A3 CU21712 A3 CU 21712A3
- Authority
- CU
- Cuba
- Prior art keywords
- urea
- solution
- ammonia
- carbon dioxide
- concentrated
- Prior art date
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title abstract 9
- 239000004202 carbamide Substances 0.000 title abstract 9
- 238000000034 method Methods 0.000 title abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 10
- 229910021529 ammonia Inorganic materials 0.000 abstract 6
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 5
- 239000001569 carbon dioxide Substances 0.000 abstract 5
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 abstract 4
- 230000015572 biosynthetic process Effects 0.000 abstract 3
- 238000000354 decomposition reaction Methods 0.000 abstract 3
- 238000003786 synthesis reaction Methods 0.000 abstract 3
- 239000008246 gaseous mixture Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Un procedimiento para preparar urea, en el que: en una zona de síntesis, a una presión de 125-350 bares y a la temperatura correspondiente a la zona, se forma una disolución de síntesis de urea que contiene carbamato y amoníaco libre, a partir de dióxido de carbono y un exceso de amoníaco; en una primera operación de descomposición, a presión de síntesis o inferior, una parte del carbamato se descompone por suministro de calor, y la fase gaseosa obtenida en este procedimiento se condensa en una primera zona de condensación; en una segunda operación de descomposición, a una presión de 4-40 bares, otra parte del carbamato aún presente se descompone por suministro de calor y se separa la fase gaseosa formada; en otra operación, el carbamato restante se separa en forma de una mezcla gaseosa que contiene amoníaco y dióxido de carbono, y esta mezcla gaseosa que contiene amoníaco y dióxido de carbono se trata para formar una disolución de amoníaco y dióxido de carbono en agua y la disolución restante que contiene urea se trata para formar una disolución concentrada de urea, caracterizada porque la disolución de urea a concentrar se introduce en los tubos de un cambiador de calor de carcasa y tubos, la mezcla gaseosa se la segunda operación de descomposición se introduce en el lado de la carcasa del cambiador de calor en el extremo opuesto al lugar en que se introduce la disolución de urea a concentrar, la disolución de amoníaco y dióxido de carbono, en un lugar de situado entre la entrada de la mezcla gaseosa y la entrada de la disolución de urea a concentrar, y el producto de concentración se descarga del lado de la carcasa en el extremo en que se introduce en los tubos la disolución de urea a concentrarA process for preparing urea, in which: in a synthesis zone, at a pressure of 125-350 bar and at the temperature corresponding to the zone, a urea synthesis solution containing carbamate and free ammonia is formed from carbon dioxide and excess ammonia; in a first decomposition operation, at synthesis pressure or lower, a part of the carbamate decomposes by supplying heat, and the gas phase obtained in this process is condensed in a first condensation zone; in a second decomposition operation, at a pressure of 4-40 bar, another part of the carbamate still present decomposes by supplying heat and the gas phase formed is separated; In another operation, the remaining carbamate is separated as a gaseous mixture containing ammonia and carbon dioxide, and this gaseous mixture containing ammonia and carbon dioxide is treated to form a solution of ammonia and carbon dioxide in water and the Remaining urea-containing solution is treated to form a concentrated urea solution, characterized in that the urea solution to be concentrated is introduced into the tubes of a shell and tube heat exchanger, the gas mixture in the second decomposition operation is introduced into the side of the heat exchanger housing at the end opposite the place where the urea solution to be concentrated, the ammonia and carbon dioxide solution, is introduced at a location between the gas mixture inlet and the inlet of the urea solution to be concentrated, and the concentration product is discharged from the side of the housing at the end where the d is introduced into the tubes urea solution to concentrate
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CU36231A CU21712A3 (en) | 1984-12-12 | 1984-12-12 | PROCEDURE FOR THE PREPARATION OF UREA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CU36231A CU21712A3 (en) | 1984-12-12 | 1984-12-12 | PROCEDURE FOR THE PREPARATION OF UREA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CU21712A3 true CU21712A3 (en) | 1991-07-15 |
Family
ID=47352129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CU36231A CU21712A3 (en) | 1984-12-12 | 1984-12-12 | PROCEDURE FOR THE PREPARATION OF UREA |
Country Status (1)
| Country | Link |
|---|---|
| CU (1) | CU21712A3 (en) |
-
1984
- 1984-12-12 CU CU36231A patent/CU21712A3/en unknown
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