CN219050365U - PVC system high-boiling-point material recycling device - Google Patents
PVC system high-boiling-point material recycling device Download PDFInfo
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- CN219050365U CN219050365U CN202223232927.7U CN202223232927U CN219050365U CN 219050365 U CN219050365 U CN 219050365U CN 202223232927 U CN202223232927 U CN 202223232927U CN 219050365 U CN219050365 U CN 219050365U
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- vinyl chloride
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- boiling
- dichloroethane
- ethylene dichloride
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Abstract
The utility model provides a PVC system high-boiling-point material recycling device, which comprises a high-boiling-point material tank, wherein the high-boiling-point material tank is connected with a vinyl chloride rectifying tower through a vinyl chloride feed pump, the top of the vinyl chloride rectifying tower is sequentially connected with a vinyl chloride condenser and a vinyl chloride reflux tank through pipelines, and the vinyl chloride reflux tank is connected with the vinyl chloride rectifying tower through the vinyl chloride reflux pump. The method has the advantages of simple process and high recovery rate, the high-boiling-point substances are thoroughly separated and recovered by adopting the two-stage rectifying device, 97% of components in the original high-boiling-point substances are recycled, the polyvinyl chloride is recycled to produce PVC resin, and the dichloroethane is recycled and sold as a product, so that the environment pollution is avoided, the resources are fully, reasonably and effectively utilized, the economic benefit of enterprises is increased, and the competitiveness of the enterprises is improved.
Description
Technical Field
The utility model relates to a recycling device for high-boiling-point materials of a PVC system, in particular to a recycling device for rectifying high-boiling-point materials generated in the production process of polyvinyl chloride by a calcium carbide method or an ethylene method, and belongs to the technical field of polyvinyl chloride industry.
Background
The polyvinyl chloride industry is an industry in which acetylene, chlorine, hydrogen or ethylene and chlorine are used as raw materials, and the polyvinyl chloride is prepared through VCM synthesis and polymerization. In recent years, the production capacity of the polyvinyl chloride industry in China is rapidly improved, and meanwhile, the laggbehind hazardous waste treatment mode can not meet the requirements of enterprise safety, energy conservation and environmental protection production. For example, the main components of the high-boiling substances generated in the rectification process of the PVC system are dichloroethane (70-80 wt%) and chloroethylene (20-30 wt%) and are mixed with organic substances such as trichloroethylene and tetrachloroethylene, and meanwhile rust residues, coked substances and the like are entrained, so that the viscosity is high, the components are complex, and the treatment difficulty is high; PVC manufacturing enterprises directly transfer the hazardous waste to units with treatment qualification for treatment, a receiving unit adopts a simple heating and steaming mode, vinyl chloride which cannot be recycled is directly emptied or burnt, only dichloroethane is recycled, waste residues at the bottom of a recycling tower are buried, and the recycling mode is relatively coarse and open. The PVC production enterprises and the hazardous waste receiving units discharge 20-30wt% of chloroethylene in the high-boiling-point substances during the treatment process of the high-boiling-point substances, so that the environmental pollution is serious; meanwhile, for PVC production enterprises, the high-boiling-point substances treated as dangerous waste transfer treatment contain a large amount of recoverable vinyl chloride and dichloroethane, wherein the vinyl chloride is a raw material for producing PVC resin, the dichloroethane is a good industrial solvent for industries such as coating, textile and the like, has high commercial use potential, has high practical economic value, and the PVC enterprises do not recover the high-boiling-point substances and treat the high-boiling-point substances directly as dangerous waste, so that resources are seriously wasted, and great economic loss is caused.
Disclosure of Invention
Aiming at the problems that the high-boiling-point substances are treated as dangerous wastes and the vinyl chloride contained in the high-boiling-point substances is wasted through extensive recycling and environmental pollution, the utility model provides the recycling device for the PVC system high-boiling-point substances, which has the advantages of reasonable design, simple recycling process, low cost investment and effective recycling of the vinyl chloride in the high-boiling-point substances, recycling of the vinyl chloride in the system production PVC, recycling of the dichloroethane as a product for sales, and fundamentally reducing the dangerous waste production (the dangerous waste production is reduced by 97%).
The present utility model is achieved by the following technique.
The high-boiling-point material recycling device for the PVC system comprises a high-boiling-point material tank, wherein the high-boiling-point material tank is connected with a vinyl chloride rectifying tower through a vinyl chloride feeding pump, the top of the vinyl chloride rectifying tower is sequentially connected with a vinyl chloride condenser and a vinyl chloride reflux tank through pipelines, the vinyl chloride reflux tank is connected with the vinyl chloride rectifying tower through the vinyl chloride reflux pump, the vinyl chloride condenser is also connected with a gas holder, and a vinyl chloride rectifying tower reboiler is arranged at the bottom of the vinyl chloride rectifying tower;
the ethylene chloride rectifying tower kettle is connected with an ethylene dichloride rectifying tower through a pipeline, the top of the ethylene dichloride rectifying tower is sequentially connected with an ethylene dichloride condenser and an ethylene dichloride reflux tank through a pipeline, the ethylene dichloride reflux tank is connected with the ethylene dichloride rectifying tower through an ethylene dichloride reflux pump, the pipeline between the ethylene dichloride reflux pump and the ethylene dichloride rectifying tower is connected with an ethylene dichloride product storage tank, the bottom of the ethylene dichloride rectifying tower is connected with a residual high-boiling-point substance storage tank through a kettle liquid cooler, the ethylene dichloride condenser is also connected with a gas holder, and the bottom of the ethylene dichloride rectifying tower is provided with an ethylene dichloride rectifying tower reboiler.
The utility model has the beneficial effects that: the process is simple, the recovery rate is high, hazardous waste resources of PVC production enterprises are utilized to the maximum extent, the high-boiling-point substances are thoroughly separated and recovered by adopting a two-stage rectifying device, 97% of components in the original high-boiling-point substances are recycled, the vinyl chloride is recycled to produce PVC resin, and dichloroethane (the purity is more than or equal to 99.95 wt%) is recycled and sold as a product, so that the environment pollution is avoided, the resources are fully, reasonably and effectively utilized, the economic benefit of enterprises is increased, and the competitiveness of the enterprises is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure, a 1-high-boiling-point substance raw material tank; 2-vinyl chloride feed pump; 3-chloroethylene rectifying tower reboiler; 4-chloroethylene rectifying tower; a 5-chloroethylene condenser; a 6-chloroethylene reflux tank; 7-chloroethylene reflux pump; 8-dichloroethane rectifying tower reboiler; 9-dichloroethane rectifying column; a 10-dichloroethane condenser; 11-dichloroethane reflux drum; a 12-dichloroethane reflux pump; 13-a kettle liquid cooler; 14-a gas holder; 15-dichloroethane product storage tank; 16-a residual high-boiling-point substance storage tank.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
as shown in figure 1, the recycling device for the high-boiling-point materials of the PVC system comprises a high-boiling-point material tank 1, wherein the high-boiling-point materials of the materials generated in the VCM rectification working section are stored in the high-boiling-point material tank 1, the high-boiling-point material tank 1 is connected with a vinyl chloride rectification tower 4 through a vinyl chloride feed pump 2, and a control valve for controlling the feeding of the high-boiling-point materials is arranged on a pipeline between the high-boiling-point material tank 1 and the vinyl chloride rectification tower 4. The top of the vinyl chloride rectifying tower 4 is sequentially connected with a vinyl chloride condenser 5 and a vinyl chloride reflux tank 6 through pipelines, a control valve is arranged on the pipeline between the top of the vinyl chloride rectifying tower 4 and the vinyl chloride condenser 5, and the vinyl chloride condenser 5 is also connected with a gas holder 14. The vinyl chloride reflux tank 6 is connected with the vinyl chloride rectifying tower 4 through a vinyl chloride reflux pump 7, and a control valve for controlling reflux flow is arranged on the pipelines of the vinyl chloride reflux tank 6 and the vinyl chloride rectifying tower 4. The bottom of the vinyl chloride rectifying tower 4 is provided with a vinyl chloride rectifying tower reboiler 3.
The tower bottom of the vinyl chloride rectifying tower 4 is connected with a dichloroethane rectifying tower 9 through a pipeline and a control valve, the top of the dichloroethane rectifying tower 9 is sequentially connected with a dichloroethane condenser 10 and a dichloroethane reflux tank 11 through pipelines, the pipelines of the top of the dichloroethane rectifying tower 9 and the dichloroethane condenser 10 are provided with the control valve, and the dichloroethane condenser 10 is also connected with a gas holder 14. The dichloroethane reflux tank 11 is connected with the dichloroethane rectifying tower 9 through a dichloroethane reflux pump 12, and a control valve for controlling the dichloroethane reflux is arranged on a pipeline between the dichloroethane reflux tank 11 and the dichloroethane rectifying tower 9. The pipeline between the dichloroethane reflux pump 12 and the dichloroethane rectifying tower 9 is connected with a dichloroethane product storage tank 15 through a control valve, and the bottom of the dichloroethane rectifying tower 9 is connected with a residual high-boiling-point substance storage tank 16 through a control valve and a kettle liquid cooler 13. The bottom of the dichloroethane rectifying tower 9 is provided with a reboiler 8 of the dichloroethane rectifying tower.
When in use, the flow of the device is as follows:
A. the raw material high-boiling-point substances in the high-boiling-point substance raw material tank 1 are conveyed to a vinyl chloride rectifying tower 4 through a vinyl chloride feeding pump 2, a vinyl chloride rectifying tower reboiler 3 adopts saturated steam to heat, vinyl chloride gas (99.96 wt%) is distilled out from the top of the vinyl chloride rectifying tower 4, and after being partially condensed through a vinyl chloride condenser 5, vinyl chloride liquid enters a vinyl chloride reflux tank 6 and is subjected to reflux control through a vinyl chloride reflux pump 7; the non-condensable vinyl chloride gas is decompressed and then the gas tank 14 is used for producing PVC.
B. The liquid in the tower bottom of the vinyl chloride rectifying tower 4 is self-pressed to a dichloroethane rectifying tower 9, the dichloroethane rectifying tower is an atmospheric tower, a reboiler 8 of the dichloroethane rectifying tower adopts saturated steam to heat, the dichloroethane gas is distilled out from the tower top of the dichloroethane rectifying tower 9, and after being condensed by a dichloroethane condenser 10, the dichloroethane liquid enters a dichloroethane reflux tank 11 and is refluxed by a dichloroethane reflux pump 12; the non-coagulated trace vinyl chloride gas is decompressed and then the gas tank 14 is used for producing PVC.
C. In the process of the liquid-phase reflux of the dichloroethane, sampling and analyzing the outlet of a reflux pump 12 of a dichloroethane rectifying tower, and when the content of the dichloroethane is more than or equal to 99.95wt%, partially opening a valve of a storage tank 15 for removing the dichloroethane to enable the qualified product to enter the storage tank 15 for selling the dichloroethane; the residual liquid in the tower kettle of the dichloroethane rectifying tower 9 is quantitatively discharged once every 8 hours, cooled by the kettle liquid cooler 13 and discharged to the residual high-boiling-point substance storage tank 16, and after a certain amount, the residual high-boiling-point substance storage tank is pumped to a loading station for loading as dangerous waste treatment, and the dangerous waste is transferred.
Claims (5)
1. The utility model provides a PVC system high boiling point material resource recovery unit which characterized in that: the high-boiling-point material tank is connected with a vinyl chloride rectifying tower through a vinyl chloride feeding pump, the top of the vinyl chloride rectifying tower is sequentially connected with a vinyl chloride condenser and a vinyl chloride reflux tank through pipelines, and the vinyl chloride reflux tank is connected with the vinyl chloride rectifying tower through the vinyl chloride reflux pump;
the bottom of the ethylene chloride rectifying tower is connected with a ethylene dichloride rectifying tower through a pipeline, the top of the ethylene dichloride rectifying tower is sequentially connected with an ethylene dichloride condenser and an ethylene dichloride reflux tank through a pipeline, the ethylene dichloride reflux tank is connected with the ethylene dichloride rectifying tower through an ethylene dichloride reflux pump, the pipeline between the ethylene dichloride reflux pump and the ethylene dichloride rectifying tower is connected with an ethylene dichloride product storage tank, and the bottom of the ethylene dichloride rectifying tower is connected with a residual high-boiling-point substance storage tank through a kettle liquid cooler.
2. The recycling device for high-boiling-point materials of a PVC system according to claim 1, wherein: the chloroethylene condenser is also connected with a gas holder.
3. The recycling device for high-boiling-point materials of a PVC system according to claim 1, wherein: the bottom of the vinyl chloride rectifying tower is provided with a vinyl chloride rectifying tower reboiler.
4. The recycling device for high-boiling-point materials of a PVC system according to claim 1, wherein: the dichloroethane condenser is also connected with a gas holder.
5. The recycling device for high-boiling-point materials of a PVC system according to claim 1, wherein: and the bottom of the dichloroethane rectifying tower is provided with a reboiler of the dichloroethane rectifying tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223232927.7U CN219050365U (en) | 2022-12-04 | 2022-12-04 | PVC system high-boiling-point material recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223232927.7U CN219050365U (en) | 2022-12-04 | 2022-12-04 | PVC system high-boiling-point material recycling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219050365U true CN219050365U (en) | 2023-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223232927.7U Active CN219050365U (en) | 2022-12-04 | 2022-12-04 | PVC system high-boiling-point material recycling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219050365U (en) |
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2022
- 2022-12-04 CN CN202223232927.7U patent/CN219050365U/en active Active
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