Residual chlorine removal device for chlorinated polyvinyl chloride mixture

Abstract

The utility model discloses a chlorinated polyvinyl chloride mixture residual chlorine removal device, and relates to the technical field of chlorinated polyvinyl chloride production. A discharge port of a degassing tank is communicated with a dechlorinated material storage tank through a pipeline; a gas outlet of the degassing tank is communicated with a first filter through a pipeline, and an outlet of the first filter is communicated with a vacuum pump through a pipeline. After the vacuum pump is started, negative pressure degassing is carried out on the degassing tank, most residual chlorine in the polyvinyl chloride mixture is pumped out, powder pumped out through negative pressure is collected by the first filter, waste of raw materials is avoided, and meanwhile the situation that the powder mixture enters air and pollutes the environment is avoided. After the residual chlorine in the chlorinated polyvinyl chloride mixture is reduced, the long-term storage stability of the mixture and the thermal stability during processing are greatly improved, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chlorinated polyvinyl chloride production, in particular to a device for removing residual chlorine from a chlorinated polyvinyl chloride mixture. Background Art

[0002] Chlorinated polyvinyl chloride (CPVC) is an important chemical raw material, widely used in wires and cables, pipelines, building materials and other fields. Before CPVC is used, it is necessary to add heat stabilizers, lubricants, impact modifiers, processing aids, antioxidants, titanium dioxide, pigments and other auxiliary materials to mix into CPVC mixture.

[0003] The current CPVC mixture mixing process includes raw material metering, feeding, hot mixing, cold mixing, and packaging or storage. During the hot mixing process, under the action of high-intensity shear force, the temperature of the CPVC mixture reaches 110°C to 130°C. After cold mixing, the temperature of the CPVC mixture drops to between 50°C and 70°C, and then it is packaged or stored. This leads to a sharp increase in the residual chlorine content in the CPVC mixture due to the thermal decomposition of CPVC during the mixing process. On the one hand, it is easy to cause heat accumulation in the CPVC mixture during storage, resulting in the continued thermal decomposition process of CPVC, which reduces the thermal stability quality of the CPVC mixture. On the other hand, the increase in the residual chlorine content in the CPVC mixture has a very adverse effect on the long-term storage of the CPVC mixture. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a device for removing residual chlorine from a chlorinated polyvinyl chloride mixture is provided, which reduces the content of residual chlorine in the chlorinated polyvinyl chloride mixture and improves the quality of the product.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture, comprising a degassing tank, wherein a feed port of the degassing tank is connected to a chlorinated polyvinyl chloride mixture tank through a pipeline, and a discharge port of the degassing tank is connected to a dechlorinated material storage tank through a pipeline;

[0007] The gas outlet of the degassing tank is connected to a first filter through a pipeline, and the outlet of the first filter is connected to a vacuum pump through a pipeline.

[0008] As an improved technical solution, the dust overflow port of the degassing tank is connected to a dust recovery tank through a pipeline, and the air inlet of the degassing tank is connected to a blower through a pipeline.

[0009] As an improved technical solution, a refrigerated air dryer is provided between the degassing tank and the blower.

[0010] As an improved technical solution, an air adsorption dryer is provided between the refrigerated air dryer and the degassing tank.

[0011] As an improved technical solution, the inlet of the blower is connected to an air filter through a pipeline.

[0012] As an improved technical solution, the gas outlet of the degassing tank is provided with an automatic regulating valve, the degassing tank is provided with a pressure sensor, and the automatic regulating valve and the pressure sensor are interlocked to a control system.

[0013] As a preferred technical solution, the outlet of the dust recovery tank is connected to a spray tower through a pipeline.

[0014] As a preferred technical solution, a second filter is provided between the dust recovery tank and the spray tower.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model discloses a device for removing residual chlorine from a chlorinated polyvinyl chloride mixture, comprising a degassing tank, wherein the feed port of the degassing tank is connected to a chlorinated polyvinyl chloride mixture tank through a pipeline, and the discharge port of the degassing tank is connected to a dechlorinated material storage tank through a pipeline; the gas outlet of the degassing tank is connected to a first filter through a pipeline, and the outlet of the first filter is connected to a vacuum pump through a pipeline. After the vacuum pump is turned on, the degassing tank is degassed under negative pressure to extract most of the residual chlorine in the polyvinyl chloride mixture, and the powder extracted under negative pressure is collected by the first filter, thereby avoiding the waste of raw materials and also preventing the powder mixture from entering the air and causing pollution to the environment. After the residual chlorine in the chlorinated polyvinyl chloride mixture is reduced, the long-term storage stability of the mixture and the thermal stability during processing are greatly improved, thereby improving the quality of the product.

[0017] The dust overflow port of the degassing tank of the utility model is connected to a dust recovery tank through a pipeline, and the air inlet of the degassing tank is connected to a blower through a pipeline. The blower can break the negative pressure in the degassing tank on the one hand, and can cool the chlorinated polyvinyl chloride mixture after the air is introduced on the other hand, further reducing the discharge temperature of the mixture, avoiding thermal decomposition of the mixture due to heat accumulation, thereby reducing the quality of the chlorinated polyvinyl chloride mixture.

[0018] A refrigerated air dryer is provided between the degassing tank and the blower, and an air suction dryer is provided between the refrigerated air dryer and the degassing tank. The air entering the degassing tank is double dried by the refrigerated air dryer and the air suction dryer to prevent moisture from entering the degassing tank, causing the water content of the product to increase and affecting the quality of the product.

[0019] The inlet of the blower is connected to an air filter through a pipeline, and the air entering the blower is filtered by the air filter to prevent impurities in the air from entering the degassing tank and contacting the chlorinated polyvinyl chloride mixture, thereby reducing the quality of the product.

[0020] The gas outlet of the degassing tank is provided with an automatic regulating valve, the degassing tank is provided with a pressure sensor, and the automatic regulating valve and the pressure sensor are interlocked to a control system. The control system controls the opening of the automatic regulating valve according to the value of the pressure sensor, so that the degassing tank maintains a stable negative pressure, and the degassing effect is better.

[0021] The outlet of the dust recovery tank is connected to a spray tower through a pipeline, and the overflowed gas is adsorbed by the spray tower to achieve a deodorizing effect, which is environmentally friendly.

[0022] A second filter is provided between the dust recovery tank and the spray tower to collect overflowed mixed material dust to avoid waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0025] Among them: 1. Degassing tank; 2. Chlorinated polyvinyl chloride mixture tank; 3. Dechlorination material storage tank; 4. First filter; 5. Vacuum pump; 6. Dust recovery tank; 7. Blower; 8. Refrigerated air dryer; 9. Air dryer; 10. Air filter; 11. Automatic regulating valve; 12. Pressure sensor; 13. Second filter; 14. Spray tower. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, a device for removing residual chlorine from a chlorinated polyvinyl chloride mixture comprises a degassing tank 1, wherein the feed port of the degassing tank 1 is connected to a chlorinated polyvinyl chloride mixture tank 2 through a pipeline, and the discharge port of the degassing tank 1 is connected to a dechlorinated material storage tank 3 through a pipeline; the gas outlet of the degassing tank 1 is connected to a first filter 4 through a pipeline, and the outlet of the first filter 4 is connected to a vacuum pump 5 through a pipeline. After the vacuum pump 5 is turned on, the degassing tank 1 is degassed under negative pressure to extract most of the residual chlorine in the polyvinyl chloride mixture, and the powder extracted under negative pressure is collected by the first filter 4, thereby avoiding the waste of raw materials and also preventing the powder mixture from entering the air and causing pollution to the environment. After the residual chlorine in the chlorinated polyvinyl chloride mixture is reduced, the long-term storage stability and thermal stability of the mixture during processing are greatly improved, thereby improving the quality of the product.

[0028] The dust overflow port of the degassing tank 1 is connected to a dust recovery tank 6 through a pipeline, and the air inlet of the degassing tank 1 is connected to a blower 7 through a pipeline. The blower 7 can break the negative pressure in the degassing tank 1 on the one hand, and can cool the chlorinated polyvinyl chloride mixture after the air is introduced, further reducing the discharge temperature of the mixture, avoiding thermal decomposition of the mixture due to heat accumulation, thereby reducing the quality of the chlorinated polyvinyl chloride mixture.

[0029] A refrigerated air dryer 8 is provided between the degassing tank 1 and the blower 7, and an air suction dryer 9 is provided between the refrigerated air dryer 8 and the degassing tank 1. The air entering the degassing tank 1 is double dried by the refrigerated air dryer 8 and the air suction dryer 9 to prevent moisture from entering the degassing tank 1, causing the water content of the product to increase and affecting the quality of the product.

[0030] The inlet of the blower 7 is connected to an air filter 10 through a pipeline, and the air entering the blower 7 is filtered by the air filter 10 to prevent impurities in the air from entering the degassing tank 1 and contacting the chlorinated polyvinyl chloride mixture, thereby reducing the quality of the product.

[0031] The gas outlet of the degassing tank 1 is provided with an automatic regulating valve 11, and the degassing tank 1 is provided with a pressure sensor 12. The automatic regulating valve 11 and the pressure sensor 12 are interlocked to a control system. The control system controls the opening of the automatic regulating valve 11 according to the value of the pressure sensor 12, so that the degassing tank 1 maintains a stable negative pressure, and the degassing effect is better.

[0032] The outlet of the dust recovery tank 6 is connected to a spray tower 14 through a pipeline. The spray tower 14 adsorbs the overflowed gas to achieve a deodorizing effect, which is environmentally friendly.

[0033] A second filter 13 is provided between the dust recovery tank 6 and the spray tower to collect overflowed mixed material dust to avoid waste of raw materials.

[0034] The working principle of this utility model:

[0035] 1. Open the inlet valve of vacuum pump 5, close other connecting port valves, and then open vacuum pump 5 to perform negative pressure degassing for 5 minutes to absorb the residual chlorine in the chlorinated polyvinyl chloride mixture.

[0036] 2. Turn off the vacuum pump 5, close the inlet valve of the vacuum pump 5, open the connecting valve between the blower 7 and the degassing tank 1, close the valves of other connecting ports, then turn on the blower 7, the refrigerated air dryer 8, and the air dryer 9, open the valve at the dust overflow port of the degassing tank 1 after normal pressure, and use dry air to blow the chlorinated polyvinyl chloride mixture in the degassing tank 1 to further discharge the residual chlorine.

[0037] 3. Then open the valve at the discharge port of the degassing tank 1, close the valve at the dust overflow port, and the chlorinated polyvinyl chloride mixture after the residual chlorine is removed enters the dechlorination material storage tank 3 for storage.

[0038] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture, characterized in that: It comprises a degassing tank, wherein the feed port of the degassing tank is connected to a chlorinated polyvinyl chloride mixed material tank through a pipeline, and the discharge port of the degassing tank is connected to a dechlorinated material storage tank through a pipeline; The gas outlet of the degassing tank is connected to a first filter through a pipeline, and the outlet of the first filter is connected to a vacuum pump through a pipeline.

2. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 1, characterized in that: The dust overflow port of the degassing tank is connected to a dust recovery tank through a pipeline, and the air inlet of the degassing tank is connected to a blower through a pipeline.

3. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 2, characterized in that: A refrigerated air dryer is provided between the degassing tank and the blower.

4. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 3, characterized in that: An air adsorption dryer is provided between the refrigerated air dryer and the degassing tank.

5. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 2, characterized in that: The inlet of the blower is connected to an air filter through a pipeline.

6. The device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 1, characterized in that: The gas outlet of the degassing tank is provided with an automatic regulating valve, and the degassing tank is provided with a pressure sensor. The automatic regulating valve and the pressure sensor are interlocked to a control system.

7. A device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 2, characterized in that: The outlet of the dust recovery tank is connected to a spray tower through a pipeline.

8. The device for removing residual chlorine from a chlorinated polyvinyl chloride mixture as claimed in claim 7, characterized in that: A second filter is provided between the dust recovery tank and the spray tower.

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