CN218833596U - Chlorinated ethylene carbonate rectification system - Google Patents
Chlorinated ethylene carbonate rectification system Download PDFInfo
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- CN218833596U CN218833596U CN202222390214.7U CN202222390214U CN218833596U CN 218833596 U CN218833596 U CN 218833596U CN 202222390214 U CN202222390214 U CN 202222390214U CN 218833596 U CN218833596 U CN 218833596U
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- cooler
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- ethylene carbonate
- chlorinated ethylene
- deacidification
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- 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
- Y02P20/10—Process efficiency
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Abstract
The utility model discloses a chlorinated ethylene carbonate rectification system, which comprises a tower kettle, a deacidification tower, a circulating pump, a cooler, a dichloroethylene carbonate receiving tank and a vacuum pump; the tower kettle is provided with a jacket for self-heating; the top of the tower kettle is connected with the deacidification tower, the bottom of the tower kettle is connected with the inlet of a circulating pump, and the outlet of the circulating pump is connected with the deacidification tower; the deacidification tower is connected with a cooler, and the bottom of the cooler is connected with a dichloroethylene carbonate receiving tank; the cooler is connected with a vacuum pump. When the chlorinated ethylene carbonate rectification system works, a CEC crude product enters the tower kettle of the deacidification tower, the vacuum degree of the system is increased to be above 80KPa by using a vacuum pump, and the temperature of the tower kettle is increased to be within the range of 70-80 ℃ atHCL, CL in the state of forced circulation of the circulating pump 2 Impurities such as DCEC enter the cooler in other states, the DCEC is condensed into liquid in the cooler, and the liquid enters the collection tank, HCL and CL 2 Then the gas enters a vacuum pump water tank to be absorbed or enters a tail gas system in a gas state, thereby achieving the effects of deacidification and purification.
Description
Technical Field
The utility model relates to a rectification system, concretely relates to chlorinated ethylene carbonate rectification system.
Background
Vinyl chlorocarbonate (CEC) is used as a raw material for producing fluoroethylene carbonate (FEC), since CEC acid value and purity have a large influence on FEC reaction, and since the reaction time and potassium fluoride consumption are relatively reduced as CEC acid value is smaller and purity is higher, CEC is required to be deacidified before it is involved in synthesis reaction. The existing deacidification treatment adopts a nitrogen blowing mode, and a tower kettle does not have a jacket heating function because of the nitrogen blowing mode, the temperature in the tower kettle cannot be increased, and the adopted treatment system is shown in figure 1, and HCl and CL in CEC are treated by nitrogen 2 And carrying the acidic substances to a tail gas system to obtain CEC with a low acid value. However, the method has long deacidification time and high energy consumption, and does not have the purification function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a chlorinated ethylene carbonate rectification system to shorten the fluorination reaction time and improve the productivity.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a rectification system of chlorinated ethylene carbonate comprises a tower kettle, a deacidification tower, a circulating pump, a cooler, a dichloroethylene carbonate receiving tank and a vacuum pump; wherein the content of the first and second substances,
the tower kettle is provided with a jacket for self-heating; the top of the tower kettle is connected with the deacidification tower, the bottom of the tower kettle is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the deacidification tower;
the deacidification tower is connected with a cooler, and the bottom of the cooler is connected with a dichloroethylene carbonate receiving tank;
the cooler is connected with a vacuum pump.
Furthermore, a cyclone dust removal and liquid removal buffer tank is arranged between pipelines connected with the cooler and the vacuum pump, and a cooling coil is arranged inside the cyclone dust removal and liquid removal buffer tank.
Further, the heating medium in the jacket is steam.
Furthermore, the material of the tower kettle is carbon steel lining enamel, and a stirrer is arranged in the tower kettle.
Furthermore, the deacidification tower is made of carbon steel lining enamel, regular ceramic packing is arranged in the deacidification tower, a circulating pump feeding hole is formed in the upper portion of the deacidification tower and is connected with a circulating pump, and a vacuum pipeline access opening is formed in the top of the deacidification tower and is connected with a cooler.
Furthermore, the cooler is made of graphite.
Furthermore, the cyclone dust removal and liquid removal buffer tank is made of carbon steel lining enamel, the inlet is of a square structure, the upper part of the cyclone dust removal and liquid removal buffer tank is of a cylindrical structure, and the lower part of the cyclone dust removal and liquid removal buffer tank is of a cone structure.
Further, the vacuum pump is a water jet vacuum pump.
Compared with the prior art, the utility model, its beneficial effect lies in:
when the chlorinated ethylene carbonate rectification system works, a CEC crude product enters the tower kettle of the deacidification tower, the vacuum degree of the system is increased to be above 80KPa by using a vacuum pump, the temperature of the tower kettle is increased to be within 70-80 ℃, and HCL and CL are performed in a forced circulation state of a circulating pump 2 Impurities such as DCEC enter the cooler in other states, the DCEC is condensed into liquid in the cooler, and the liquid enters the collection tank, HCL and CL 2 Then the gas enters a vacuum pump water tank to absorb or enters a tail gas system in a gas state, thereby achieving the effects of deacidification and purification. The chlorinated ethylene carbonate rectification system is adopted to replace a nitrogen blowing deacidification mode shown in figure 1, and the following effects are achieved:
1. CEC with a purity of 75% can be purified to 80%;
2. the fluorination reaction time is reduced from the original 16-18 hours to 10-12 hours, so that the productivity is improved;
3. the molar ratio of the potassium fluoride participating in the fluorination reaction is reduced from 1;
4. the nitrogen is removed, and the operation cost is low.
Drawings
FIG. 1 is a schematic diagram of a prior art system for deacidification using nitrogen blowing;
FIG. 2 is a rectification system of chlorinated ethylene carbonate provided by the embodiment of the present invention;
in the figure: 1. a tower kettle; 1-1, a jacket; 2. a deacidification tower; 3. a circulation pump; 4. a cooler; 5. a dichloroethylene carbonate receiving tank; 6. a vacuum pump; 7. cyclone dust removal and liquid removal buffer tank.
Detailed Description
Example (b):
in the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; they may be mechanically coupled, directly coupled, or indirectly coupled through an intermediary, which may be referred to as communication between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art. The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Referring to fig. 2, the rectification system of chlorinated vinyl carbonate provided in this embodiment mainly includes a tower kettle 1, a deacidification tower 2, a circulation pump 3, a cooler 4, a receiving tank 5 of chlorinated vinyl carbonate, and a vacuum pump 6.
The tower kettle 1 is provided with a jacket 1-1 for self-heating, so that the temperature in the tower kettle 1 can be adjusted by changing the existing tower kettle 1 into a jacket heating mode, thereby being beneficial to realizing vacuum rectification; that is, in this embodiment, the main function of the column bottom 1 is to provide a heating source and a rectification container. The top of the tower kettle 1 is provided with a liquid phase pipeline and a gas phase pipeline and the deacidification tower 2 phaseUnder the conditions that the pressure of the tower kettle 2 is 80KPa and the temperature is 85-90 ℃, a large amount of dichloroethylene carbonate (DCEC), HCL and CL in CEC crude product 2 The light components enter the deacidification tower 2 along a gas phase pipeline, and condensed liquid at the top of the tower flows back to the tower kettle through a liquid phase pipe; the bottom of the tower kettle 1 is connected with the inlet of the circulating pump 3, the outlet of the circulating pump 3 is connected with the deacidification tower 2, and thus, the rectification heat exchange effect can be increased under the forced circulation effect of the circulating pump 3.
The deacidification tower 2 is positioned above the tower kettle 1 and is connected with the cooler 4, the light components flow to the cooler 4, after the light components enter the cooler 4, the DCEC is cooled by the cooler 4 to become a liquid phase, and the liquid phase is extracted from the bottom of the cooler 4 to a dichloroethylene carbonate receiving tank 5. The vacuum pump 6 is connected with the cooler 4 to provide a vacuum state for the whole system and raise the vacuum degree of the system to be above-80 KPa.
When the chlorinated ethylene carbonate rectification system works, CEC crude product enters a tower kettle 1, the vacuum degree of the system is increased to be above minus 80KPa by a vacuum pump 6, the temperature of the tower kettle 1 is increased to be within 70-80 ℃, and HCL and CL are in a forced circulation state of a circulating pump 2 And impurities such as DCEC enter a cooler 4, the DCEC is condensed into liquid in the cooler 4 and enters a dichloroethylene carbonate receiving tank 5, HCL and CL are carried out 2 Then the gas enters a vacuum pump water tank to absorb or enters a tail gas system in a gas state, thereby achieving the effects of deacidification and purification. By adopting the rectification system of chlorinated ethylene carbonate to replace a nitrogen blowing deacidification mode shown in figure 1, the following effects are obtained:
1. CEC with a purity of 75% can be purified to 80%;
2. the fluorination reaction time is reduced from the original 16-18 hours to 10-12 hours, and the productivity is improved;
3. the molar ratio of the potassium fluoride participating in the fluorination reaction is reduced from 1;
4. the nitrogen is removed, and the operation cost is reduced.
As a preferred embodiment of the above-mentioned rectification system of chlorinated vinyl carbonate, a cyclone dust-removal and liquid-removal buffer tank 7 is provided between the pipes connecting the cooler 4 and the vacuum pump 6, and the cyclone dust-removal and liquid-removal buffer tank 7 is internally provided withA cooling coil is arranged. The HCL and CL can be removed by arranging a cyclone dust removal and liquid removal buffer tank 7 between the pipelines connected with the cooler 4 and the vacuum pump 6 2 Solid particles in the gas and partial liquid are condensed, so that the failure and the load of the vacuum pump 6 are reduced. Optionally, the cyclone dust removal and liquid removal buffer tank 7 is made of carbon steel lining enamel, the inlet is of a square structure, the upper part is of a cylindrical structure, and the lower part is of a conical structure, so that solid particles and condensed part of liquid can be collected conveniently.
Optionally, in a specific embodiment, the heating medium used in the jacket 1-1 is steam, which is cheap and readily available, although in other embodiments other heating media may be used; the material of the tower kettle 1 is carbon steel lining enamel, a stirrer is arranged in the tower kettle 1, and when CEC crude product is fed into the tower kettle 1, the CEC crude product can be stirred and heated uniformly through the stirrer.
Optionally, in a specific embodiment, the circulation pump 3 is a magnetic pump made of PFA lined with carbon steel, the deacidification tower 2 is made of enamel lined with carbon steel, the upper portion of the built-in structured ceramic filler is provided with a circulation pump feed inlet to be connected with the circulation pump 3, and the top portion of the built-in structured ceramic filler is provided with a vacuum pipe access port to be connected with the cooler 4. The cooler 4 is made of graphite; the vacuum pump 6 is a water jet vacuum pump made of PP.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (8)
1. A chlorinated ethylene carbonate rectification system is characterized by comprising a tower kettle, a deacidification tower, a circulating pump, a cooler, a dichloroethylene carbonate receiving tank and a vacuum pump; wherein the content of the first and second substances,
the tower kettle is provided with a jacket for self-heating; the top of the tower kettle is connected with the deacidification tower, the bottom of the tower kettle is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the deacidification tower;
the deacidification tower is connected with a cooler, and the bottom of the cooler is connected with a dichloroethylene carbonate receiving tank;
the cooler is connected with a vacuum pump.
2. The chlorinated ethylene carbonate rectification system of claim 1, wherein a cyclone dust removal and liquid removal buffer tank is arranged between the pipelines connected with the cooler and the vacuum pump, and a cooling coil is arranged inside the cyclone dust removal and liquid removal buffer tank.
3. The chlorinated ethylene carbonate rectification system of claim 1 wherein the heating medium in the jacket is steam.
4. The chlorinated ethylene carbonate rectification system of claim 1 wherein the material of the column bottom is carbon steel lined enamel and a stirrer is disposed in the column bottom.
5. The chlorinated ethylene carbonate rectification system of claim 1, wherein the deacidification tower is made of carbon steel lined enamel with structured ceramic packing, and has a circulating pump inlet at the upper part for connecting with a circulating pump, and a vacuum pipeline inlet at the top for connecting with a cooler.
6. The chlorinated ethylene carbonate rectification system of claim 1 or 5, wherein the cooler is made of graphite.
7. The chlorinated ethylene carbonate rectification system of claim 2, wherein the cyclone dust removal and liquid removal buffer tank is made of carbon steel lined enamel, and has a square inlet structure, a cylindrical upper part structure and a conical lower part structure.
8. The chlorinated ethylene carbonate rectification system of claim 1 wherein the vacuum pump is a water jet vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222390214.7U CN218833596U (en) | 2022-09-08 | 2022-09-08 | Chlorinated ethylene carbonate rectification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222390214.7U CN218833596U (en) | 2022-09-08 | 2022-09-08 | Chlorinated ethylene carbonate rectification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218833596U true CN218833596U (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222390214.7U Active CN218833596U (en) | 2022-09-08 | 2022-09-08 | Chlorinated ethylene carbonate rectification system |
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| CN (1) | CN218833596U (en) |
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2022
- 2022-09-08 CN CN202222390214.7U patent/CN218833596U/en active Active
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