CN219251695U - Methane chloride double-effect rectification system - Google Patents
Methane chloride double-effect rectification system Download PDFInfo
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- CN219251695U CN219251695U CN202321261713.4U CN202321261713U CN219251695U CN 219251695 U CN219251695 U CN 219251695U CN 202321261713 U CN202321261713 U CN 202321261713U CN 219251695 U CN219251695 U CN 219251695U
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Abstract
The utility model belongs to the field of rectification separation, and relates to a methane chloride double-effect rectification system which comprises a dichloromethane rectification tower and a chloroform rectification tower, wherein a bottom extraction outlet of the dichloromethane rectification tower is connected with a feed inlet of the chloroform rectification tower through a pipeline, a tower kettle of the dichloromethane rectification tower is provided with a dichloromethane rectification tower heat exchange reboiler, a top extraction outlet of the chloroform rectification tower is connected with a shell side inlet of the dichloromethane rectification tower heat exchange reboiler through a first pipeline, and a shell side outlet of the dichloromethane rectification tower heat exchange reboiler is connected with a top reflux port of the chloroform rectification tower through a second pipeline. The utility model adopts double-effect thermal coupling, the gas phase at the top of the chloroform rectifying tower is used as a heat source of a reboiler of the dichloromethane rectifying tower, the usage amount of steam and cooling water is greatly reduced, and the production energy consumption is reduced.
Description
Technical Field
The utility model belongs to the field of rectification separation, and particularly relates to a methane chloride double-effect rectification system.
Background
Dichloromethane is an important chemical raw material and has wide application prospect. The consumption of dichloromethane for film production is 50% of the total consumption, the consumption of the cleaning agent and the chemical industry is 20% of the total consumption, and the consumption of the cleaning agent and the chemical industry is 10% of the total consumption. Methylene chloride is also widely used as a coolant in industrial refrigeration systems.
Chloroform is also called chloroform, is colorless transparent liquid, has special smell, and can be mixed with ethanol, benzene, diethyl ether, petroleum ether, carbon tetrachloride, carbon disulfide, oil, etc. The relative density of chloroform is 1.4840, the solidifying point is-63.5 ℃, and the boiling point is 61-62 ℃. Trichloromethane is an important organic synthetic raw material, and is mainly used for producing freon (f-21, f-22, f-23), dye and medicine, and is commonly used as anesthetic in medicine. Can be used as solvent and extractant for antibiotics, perfume, grease, resin, and rubber. The chloroform and carbon tetrachloride can be mixed to prepare the unfrozen fireproof liquid. Also used for propellant of aerosol, fumigant of grain and standard liquid for calibrating temperature.
Methane chloride such as methylene dichloride, chloroform and the like can be prepared by deeply chloridizing methane chloride, and after light components are removed, a reaction product is sent to a methylene dichloride rectifying tower to separate a methylene dichloride product, and then is sent to the chloroform rectifying tower to separate the chloroform product. The methylene dichloride rectifying tower and the chloroform rectifying tower of the known rectifying process are rectified independently, all heat sources and refrigerants adopt external public engineering, and heat exchange is not carried out between the towers, so that the consumption of steam and circulating water is high, and the production cost is high.
How to reduce the energy consumption of the device is the technical problem to be solved by the application.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a methane chloride double-effect rectification system, wherein the gas phase at the top of a chloroform rectifying tower is used as a heat source of a reboiler of a dichloromethane rectifying tower, so that the use amount of steam and cooling water is greatly reduced, and the production energy consumption is reduced.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a methane chloride economic benefits and social benefits rectifying system, includes dichloromethane rectifying column, chloroform rectifying column, the bottom of the tower extraction port of dichloromethane rectifying column passes through the pipeline connection the feed inlet of chloroform rectifying column, the column bottom of dichloromethane rectifying column is provided with dichloromethane rectifying column heat transfer reboiler, the top of the tower extraction port of chloroform rectifying column passes through first pipeline connection the shell side import of dichloromethane rectifying column heat transfer reboiler, the shell side export of dichloromethane rectifying column heat transfer reboiler passes through the top of the tower reflux mouth of second pipeline connection chloroform rectifying column.
Further, a chloroform rectifying tower reflux tank and a chloroform rectifying tower reflux pump are arranged on the second pipeline.
Further, a chloroform product extraction pipeline is connected to a second pipeline between the reflux pump of the chloroform rectifying tower and the top reflux port of the chloroform rectifying tower.
Further, a reboiler of the chloroform rectifying tower is arranged at the tower bottom of the chloroform rectifying tower.
Further, a bottom extraction port of the chloroform rectifying tower is connected with a heavy component extraction pipeline.
Further, a dichloromethane rectifying tower condenser is arranged at the top of the dichloromethane rectifying tower.
Further, a dichloromethane rectifying tower reflux tank and a dichloromethane rectifying tower reflux pump are arranged between the dichloromethane rectifying tower condenser and the top reflux port of the dichloromethane rectifying tower.
Further, a methylene dichloride product extraction pipeline is connected on a pipeline between a reflux pump of the methylene dichloride rectifying tower and a reflux port at the top of the methylene dichloride rectifying tower.
The utility model has the advantages and positive effects that:
the utility model adopts double-effect thermal coupling, the gas phase at the top of the chloroform rectifying tower is used as a heat source of a reboiler of the dichloromethane rectifying tower, the usage amount of steam and cooling water is greatly reduced, and the production energy consumption is reduced.
Drawings
FIG. 1 is a block diagram of the double-effect rectification system of methane chloride of the present utility model.
1-methylene dichloride rectifying tower; 2-methylene dichloride rectifying tower heat exchange reboiler; 3-methylene dichloride rectifying tower condenser; 4-methylene dichloride rectifying tower reflux tank; 5-dichloromethane rectifying tower bottom pump; 6-methylene dichloride rectifying tower reflux pump; 7-trichloromethane rectifying tower; 8-trichloromethane rectifying tower reboiler; a 9-trichloromethane rectifying tower reflux tank; a pump at the bottom of the 10-trichloromethane rectifying tower; a reflux pump of the 11-trichloromethane rectifying tower; 12-a first line; 13-a second line.
Detailed Description
The utility model is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
The methane chloride double-effect rectification system shown in fig. 1 comprises a methylene dichloride rectification tower 1 and a chloroform rectification tower 7.
The methylene dichloride rectifying tower 1 is provided with a feed inlet, a tower top extraction outlet and a tower top reflux outlet, and a tower bottom extraction outlet. A dichloromethane rectifying tower condenser 3, a dichloromethane rectifying tower reflux tank 4 and a dichloromethane rectifying tower reflux pump 6 are arranged between the tower top extraction port and the tower top reflux port. And a methylene dichloride product extraction pipeline is connected on a pipeline between the reflux pump 6 of the methylene dichloride rectifying tower and the top reflux port of the methylene dichloride rectifying tower 1. The tower kettle of the dichloromethane rectifying tower 1 is provided with a dichloromethane rectifying tower heat exchange reboiler 2. The shell side inlet of the dichloromethane rectifying tower condenser 3 is connected with a circulating cooling water feeding CWS pipeline, and the shell side outlet is connected with a circulating cooling water backwater CWR pipeline.
The chloroform rectifying tower 7 is provided with a feed inlet, a tower top outlet and a tower top reflux port, and a tower bottom outlet. The bottom extraction port of the chloroform rectifying tower 7 is connected with a heavy component extraction pipeline through a chloroform rectifying tower bottom pump 10. The tower kettle of the chloroform rectifying tower 7 is provided with a chloroform rectifying tower reboiler 8. The shell side inlet of the trichloromethane rectifying tower reboiler 8 is connected with a steam st pipeline, and the shell side outlet is connected with a steam condensate rw pipeline.
The bottom outlet of the dichloromethane rectifying tower 1 is connected with the feed inlet of the trichloromethane rectifying tower 7 through a dichloromethane rectifying tower bottom pump 5, the top outlet of the trichloromethane rectifying tower 7 is connected with the shell side inlet of the dichloromethane rectifying tower heat exchange reboiler 2 through a first pipeline 12, and the shell side outlet of the dichloromethane rectifying tower heat exchange reboiler 2 is connected with the top reflux port of the trichloromethane rectifying tower 7 through a second pipeline 13. And a chloroform rectifying tower reflux tank 9 and a chloroform rectifying tower reflux pump 11 are arranged on the second pipeline 13. And a chloroform product extraction pipeline is connected to a second pipeline 13 between the reflux pump 11 of the chloroform rectifying tower and the reflux port of the top of the chloroform rectifying tower 7.
The technological process of the system is as follows:
the raw materials are sent into a methylene dichloride rectifying tower 1, the methylene dichloride rectifying tower 1 is provided with a methylene dichloride rectifying tower heat exchange reboiler 2, and the gas phase at the top of a chloroform rectifying tower 7 is used as a heat source; the methylene dichloride rectifying tower 1 is a positive pressure tower, the tower top pressure is normal pressure-100 kpa, the tower top temperature is 40-60 ℃, the tower bottom temperature is 70-90 ℃, the gas phase at the tower top of the methylene dichloride rectifying tower 1 enters a methylene dichloride rectifying tower condenser 3 to be condensed, the condensed liquid enters a methylene dichloride rectifying tower reflux tank 4, the materials in the methylene dichloride rectifying tower reflux tank 4 are conveyed through a methylene dichloride rectifying tower reflux pump 6, a part of the materials are returned to the methylene dichloride rectifying tower 1 as reflux liquid, and a part of the materials are extracted as methylene dichloride products. The material at the bottom of the methylene dichloride rectifying tower 1 is sent to a chloroform rectifying tower 7 through a methylene dichloride rectifying tower bottom pump 5.
The chloroform rectifying tower 7 is provided with a chloroform rectifying tower reboiler 8, and water vapor is used as a heat source; the chloroform rectifying tower 7 is a positive pressure tower, the tower top pressure is 100-300kpa, the tower top temperature is 85-105 ℃, the tower bottom temperature is 100-120 ℃, the gas phase at the tower top of the chloroform rectifying tower 7 enters a dichloromethane rectifying tower heat exchange reboiler 2 to be condensed, the condensed liquid enters a chloroform rectifying tower reflux tank 9, and a part of materials in the chloroform rectifying tower reflux tank 9 are conveyed by a chloroform rectifying tower reflux pump 11 to be returned to the chloroform rectifying tower 7 as reflux liquid, and the other part of materials are extracted as chloroform products. Heavy components at the bottom of the chloroform rectifying tower 7 are extracted by a pump 10 at the bottom of the chloroform rectifying tower.
The utility model adopts double-effect thermal coupling, and the gas phase at the top of the chloroform rectifying tower 7 is used as a heat source of a reboiler of the dichloromethane rectifying tower 1, thereby greatly reducing the use amount of steam and cooling water and reducing the production energy consumption.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that variations and modifications can be made without departing from the scope of the utility model.
Claims (7)
1. The utility model provides a methane chloride double-effect rectification system, includes dichloromethane rectifying column (1), chloroform rectifying column (7), the bottom of the tower extraction mouth of dichloromethane rectifying column (1) is through the pipeline connection the feed inlet of chloroform rectifying column (7), a serial communication port, the tower cauldron of dichloromethane rectifying column (1) is provided with dichloromethane rectifying column heat exchange reboiler (2), the top of the tower extraction mouth of chloroform rectifying column (7) is through first pipeline (12) connection the shell side import of dichloromethane rectifying column heat exchange reboiler (2), the top of the tower reflux mouth of chloroform rectifying column (7) is connected through second pipeline (13) to the shell side export of dichloromethane rectifying column heat exchange reboiler (2).
2. The double-effect rectification system for methane chloride according to claim 1, wherein a chloroform rectifying tower reflux drum (9) and a chloroform rectifying tower reflux pump (11) are arranged on the second pipeline (13).
3. The double-effect rectification system for methane chloride according to claim 2, wherein a chloroform product extraction line is connected to a second pipeline (13) between a reflux pump (11) of the chloroform rectification column and a reflux port at the top of the chloroform rectification column (7).
4. A methane chloride double-effect rectification system according to claim 3, characterized in that the column bottom of the chloroform rectification column (7) is provided with a chloroform rectification column reboiler (8).
5. The double-effect rectification system for methane chloride according to claim 4, wherein a bottom extraction port of said chloroform rectification column (7) is connected with a heavy component extraction line.
6. The double-effect rectification system for methane chloride according to claim 1, wherein a dichloromethane rectifying tower condenser (3) is arranged at the top of the dichloromethane rectifying tower (1).
7. The double-effect rectification system for methane chloride according to claim 6, wherein a dichloromethane rectifying tower reflux tank (4) and a dichloromethane rectifying tower reflux pump (6) are arranged between the dichloromethane rectifying tower condenser (3) and a top reflux port of the dichloromethane rectifying tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321261713.4U CN219251695U (en) | 2023-05-24 | 2023-05-24 | Methane chloride double-effect rectification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321261713.4U CN219251695U (en) | 2023-05-24 | 2023-05-24 | Methane chloride double-effect rectification system |
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| CN219251695U true CN219251695U (en) | 2023-06-27 |
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| CN202321261713.4U Active CN219251695U (en) | 2023-05-24 | 2023-05-24 | Methane chloride double-effect rectification system |
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2023
- 2023-05-24 CN CN202321261713.4U patent/CN219251695U/en active Active
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