CN212998463U - Tetrafluoroethylene polymerization inhibitor recovery system - Google Patents
Tetrafluoroethylene polymerization inhibitor recovery system Download PDFInfo
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- CN212998463U CN212998463U CN202021191820.0U CN202021191820U CN212998463U CN 212998463 U CN212998463 U CN 212998463U CN 202021191820 U CN202021191820 U CN 202021191820U CN 212998463 U CN212998463 U CN 212998463U
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Abstract
The utility model discloses a tetrafluoroethylene polymerization inhibitor recovery system, which comprises a flash tank, wherein the top of the flash tank is connected with a waste gas buffer tank, and the waste gas buffer tank is discharged to an incinerator for incineration after the gas is stabilized; the bottom of the flash tank is connected with a recovery tower through a pump, and liquid phase high-boiling residues are conveyed to the recovery tower through the pump; the tower top of the recovery tower is connected with a condenser, and the condenser is connected with a residue tank; a tower kettle of the recovery tower is connected with a recovery tank; the utility model discloses system equipment simple structure, processing, maintenance convenience, this system mainly is that polymerization inhibitor is different with other raffinate boiling points, through the rectification method, retrieves the purification with polymerization inhibitor.
Description
Technical Field
The utility model relates to a tetrafluoroethylene polymerization inhibitor recovery system for polymerization inhibitor in the recovery utilization tetrafluoroethylene production.
Background
Tetrafluoroethylene is a colorless, odorless, flammable, explosive gas with a melting point of-142.5 deg.c, a boiling point of-75.9 deg.c, a relative density of 1.519 (water), a relative vapor density of 3.87 (air 1), a saturated vapor pressure of 211kPa (15 deg.c), and has a wide explosive limit in the range of 46.4% -73.6% (0.1MPa) and 5% -97% (2 MPa). Tetrafluoroethylene is a very important fluorine-containing monomer, and can be used for synthesizing various polymers, such as PTFE, FEP, PFA and the like, and also used as raw materials of products such as hexafluoropropylene, C318, hexafluoroacetone, tetrafluoropropanol and the like.
Tetrafluoroethylene is very easy to self-polymerize under specific conditions, and the main factors comprise: oxygen content, moisture, acidity and warm pressure, wherein the higher the warm pressure is, the higher the water, oxygen and acid content is, the higher the self-polymerization is accelerated. Particularly under the condition of high oxygen content, tetrafluoroethylene peroxide is easy to form, adheres to the inner wall of equipment, encounters impact or friction, is easy to explode, and even causes interlocking explosion.
In order to prevent self-polymerization, besides strictly controlling temperature and pressure parameters and controlling the contents of water, oxygen and acid, a proper amount of polymerization inhibitor is added in the production process to reduce self-polymerization of tetrafluoroethylene monomer. According to the existing process steps, a polymerization inhibitor is added at the position of a feed inlet of a degassing tower and the top of a rectifying tower, which has higher operating temperature and higher tetrafluoroethylene concentration, so that tetrafluoroethylene monomer can be effectively prevented from self polymerization, and the polymerization inhibitor can become a heavy component to be concentrated in a tower kettle to become residual liquid due to higher boiling point, so that the quality of a tetrafluoroethylene finished product cannot be influenced. And after the polymerization inhibitor enters the residual liquid, conveying the residual liquid to an incinerator for incineration treatment. The physical and chemical properties of the polymerization inhibitor cannot be changed after the polymerization inhibitor enters a system, the existing process can only be used as residual liquid to be burnt, the residual liquid cannot be recycled, the amount of the residual liquid is increased, and the burden of the incinerator is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a tetrafluoroethylene polymerization inhibitor recovery system is provided, with the polymerization inhibitor recycle in the raffinate to reduce the residual liquid volume simultaneously.
In order to solve the technical problem, the tetrafluoroethylene polymerization inhibitor recovery system comprises a flash evaporation tank, wherein the top of the flash evaporation tank is connected with a waste gas buffer tank, and the gas in the waste gas buffer tank is discharged to an incinerator for incineration after being stabilized in pressure; the bottom of the flash tank is connected with a recovery tower through a pump, and liquid phase high-boiling residues are conveyed to the recovery tower through the pump; the tower top of the recovery tower is connected with a condenser, and the condenser is connected with a residue tank; and a tower kettle of the recovery tower is connected with a recovery tank.
Preferably, a reboiler is connected to the tower bottom of the recovery tower.
The utility model discloses system equipment simple structure, processing, maintenance convenience, this system mainly is that polymerization inhibitor is different with other raffinate boiling points, through the rectification method, retrieves the purification with polymerization inhibitor. The utility model discloses polymerization inhibitor rate of recovery can reach more than 85%, and the recovery component can reach more than 95%, can satisfy the requirement of recycling. And the amount of residual liquid can be reduced by about 7.2%.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the system of the present invention.
Detailed Description
As shown in fig. 1, the tetrafluoroethylene polymerization inhibitor recovery system comprises a flash tank 1, wherein the top of the flash tank 1 is connected with a waste gas buffer tank 2, and the gas in the waste gas buffer tank 2 is subjected to pressure stabilization and then discharged to an incinerator for incineration; the bottom of the flash tank 1 is connected with a recovery tower 4 through a pump 3, and the liquid phase high-boiling residue is conveyed to the recovery tower 4 through the pump 3; the top of the recovery tower 4 is connected with a condenser 5, and the condenser 5 is connected with a residue tank 6; the tower bottom of the recovery tower 4 is connected with a recovery tank 7 and a reboiler 8.
The material in the residual liquid tower containing polymerization inhibitor is controlled by pneumatic valve to reduce pressure and enter flash tank 1, the low boiling point material (HFP (-29.6 deg.C), C318(-6 deg.C), R124(-10 deg.C) is gasified and enters waste gas buffer tank 2, and the material is stabilized in pressure and discharged to incinerator for incineration. The liquid phase high boiling material is conveyed to a recovery tower 4 by a pump 3, and other residual liquid components are collected by a tower top condenser 5 because the boiling point of the polymerization inhibitor is the highest (177 ℃), and enter a residual liquid tank 6, and the residual in the tower kettle is the polymerization inhibitor. The residual polymerization inhibitor recovery process is an intermittent operation, after the tower kettle reaches a certain liquid level, sampling is qualified, and the kettle liquid is discharged to a polymerization inhibitor recovery tank 7.
The utility model discloses utilize the higher characteristic of polymerization inhibitor boiling point, adopt rectification equipment, retrieve purification polymerization inhibitor, and reduce the residual liquid volume.
The above-mentioned embodiment does not limit the utility model in any way, and all the technical solutions that adopt the mode of equivalent replacement or equivalent transform to obtain all fall within the protection scope of the utility model.
Claims (2)
1. The tetrafluoroethylene polymerization inhibitor recovery system is characterized by comprising a flash tank (1), wherein the top of the flash tank (1) is connected with a waste gas buffer tank (2), and gas in the waste gas buffer tank (2) is subjected to pressure stabilization and then discharged to an incinerator for incineration; the bottom of the flash tank (1) is connected with a recovery tower (4) through a pump (3), and the liquid phase high-boiling residue is conveyed to the recovery tower (4) through the pump (3); the top of the recovery tower (4) is connected with a condenser (5), and the condenser (5) is connected with a residue tank (6); and a tower kettle of the recovery tower (4) is connected with a recovery tank (7).
2. The tetrafluoroethylene polymerization inhibitor recovery system according to claim 1, wherein: the tower kettle of the recovery tower (4) is connected with a reboiler (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021191820.0U CN212998463U (en) | 2020-06-22 | 2020-06-22 | Tetrafluoroethylene polymerization inhibitor recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021191820.0U CN212998463U (en) | 2020-06-22 | 2020-06-22 | Tetrafluoroethylene polymerization inhibitor recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212998463U true CN212998463U (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021191820.0U Active CN212998463U (en) | 2020-06-22 | 2020-06-22 | Tetrafluoroethylene polymerization inhibitor recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212998463U (en) |
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2020
- 2020-06-22 CN CN202021191820.0U patent/CN212998463U/en active Active
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