Polymerization reaction device for PVC resin production

Abstract

The utility model relates to a polymerization reaction device for PVC (polyvinyl chloride) resin production, which comprises a polymerization kettle, a circulating pump, a pipeline reactor and a circulating port, the pipeline reactor consists of a plurality of straight pipe sections, bent pipe sections connected between two adjacent straight pipe sections, and temperature adjusting jackets arranged on the outer sides of the straight pipe sections; according to the technical scheme, the bent pipe section is provided with an inflection point, the inlet section is provided with a side cleaning short pipe, the side cleaning short pipe is tangentially connected with the outer edge of the inflection point, the side cleaning short pipe is provided with a control valve close to the bent pipe section, the outlet end of the straight pipe section is provided with a flow meter, and an outlet pipeline of the circulating pump is connected with an inlet pipeline of the buffer tank. A material taking pipe extending to the bottom of the buffer tank is additionally arranged at the top of the buffer tank, and a pressurizing feeding assembly is arranged between the upper end of the material taking pipe and the side cleaning short pipe. The device can monitor the flow of the slurry in the pipeline in real time, and can clean the slurry adhered to the bent part of the pipeline in time, so that the normal and stable operation of polymerization reaction is ensured.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, specifically to a polymerization reaction device for PVC resin production. Background Technology

[0002] The main equipment used in PVC resin production is the polymerization reactor. During production, raw materials, including water, dispersant, initiator, and VCM, are added to the reactor. With the assistance of a stirring mechanism, the reaction proceeds for 4-5 hours. Then, a terminator is added to stop the polymerization, and the discharged PVC slurry is drained through the discharge valve. The PVC slurry then undergoes a stripping process to remove the VCM from the PVC resin. Finally, it is centrifuged and dried to obtain the target product, PVC resin particles. Temperature control is crucial during the polymerization reaction and has a significant impact on product quality.

[0003] Based on this, CN 208071623 U discloses a PVC resin polymerization reactor. The polymerization unit includes a pipeline reactor and a polymerization kettle. A plunger pump is installed on the outlet pipeline of the polymerization kettle. Under the action of the plunger pump, the slurry circulates in a closed loop within the polymerization unit. The slurry in the pipeline reactor is in a flowing state, and the slurry at different stages is in the same flow range, which can realize segmented control, aiming to achieve precise monitoring of the polymerization reaction process, shorten the polymerization time, and improve production efficiency. However, the following problems still exist: slurry easily adheres to the bends in the pipeline reactor, and the accumulation increases, which is not conducive to cleaning, not conducive to long-term use, greatly reduces the slurry flow rate, and may even cause blockage. Utility Model Content

[0004] The purpose of this invention is to provide a reasonably structured and reliable polymerization reactor for PVC resin production that solves the above-mentioned problems. It can monitor the flow rate of slurry in the pipeline in real time and clean the slurry adhering to the bends in the pipeline in a timely manner, ensuring the normal and stable operation of the polymerization reaction.

[0005] The technical solution of this utility model is:

[0006] A polymerization reactor for PVC resin production includes a polymerization kettle, a circulating pump connected to the bottom discharge port of the polymerization kettle, a pipeline reactor connected to the outlet pipe of the circulating pump, and a circulation port located at the top of the polymerization kettle and connected to the end of the pipeline reactor. The pipeline reactor consists of multiple straight pipe sections, a bend connecting two adjacent straight pipe sections, and a temperature regulating jacket located outside the straight pipe sections. The key technical features are: the bend has an inflection point and a side cleaning short pipe is provided at the inlet section. The side cleaning short pipe is tangentially connected to the outer edge of the inflection point. A control valve close to the bend is provided on the side cleaning short pipe. A flow meter is provided at the outlet end of the straight pipe section. The outlet pipe of the circulating pump is also connected to the inlet pipe of a buffer tank. A material receiving pipe extending from the top of the buffer tank to its bottom is provided. A pressurized feeding assembly is provided between the upper end of the material receiving pipe and the side cleaning short pipe.

[0007] The aforementioned polymerization reactor for PVC resin production includes a pressurized feeding assembly comprising a booster pump and a pressurized pump connected to the outlet pipe of the booster pump. The inlet pipe of the booster pump is connected to the upper end of the feed pipe, and the outlet pipe of the pressurized pump is connected to the inlet of the side cleaning short pipe.

[0008] The polymerization reactor for PVC resin production described above is equipped with a discharge valve at the discharge port of the polymerization reactor, a circulation control valve at the inlet end of the pipeline reactor, and a storage control valve at the front end of the inlet pipeline of the buffer tank.

[0009] The polymerization reactor for PVC resin production described above has a heat exchange jacket on the side wall of the polymerization reactor.

[0010] The beneficial effects of this utility model are:

[0011] By monitoring the slurry flow rate in the corresponding pipe section using various flow meters, when the flow rate is lower than the set range, it indicates that there may be a blockage problem due to slurry adhesion at the upstream bend. The pressurized feeding assembly is connected between the side cleaning short pipe and the feed pipe. The booster pump and pressurized pump are started to pressurize and send the pre-stored material in the buffer tank to the side cleaning short pipe. The control valve is opened, and the pressurized material impacts the bend section after passing through the side cleaning short pipe, cleaning the bend section and achieving the purpose of timely removal of adhering material. This utility model can promptly clean the slurry adhering to the bend in the pipeline, ensuring the normal and stable operation of the polymerization reaction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0014] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0015] In the diagram: 1. Polymerization kettle, 2. Stirring mechanism, 3. Circulation port, 4. Temperature control jacket, 5. Straight pipe section, 6. Flow meter, 7. Side cleaning short pipe, 8. Feed pipe, 9. Buffer tank, 10. Storage control valve, 11. Circulation control valve, 12. Discharge valve, 13. Circulation pump, 14. Control valve, 15. Bend section. Detailed Implementation

[0016] The present invention will be described in detail with reference to the accompanying drawings.

[0017] like Figures 1-3 As shown, the polymerization reactor for PVC resin production includes a polymerization kettle 1, a circulation pump 13 connected to the discharge port at the bottom of the polymerization kettle 1, a pipeline reactor connected to the outlet pipe of the circulation pump 13, and a circulation port 3 located on the upper part of the polymerization kettle 1 and connected to the end of the pipeline reactor. The pipeline reactor consists of multiple straight pipe sections 5, bends 15 connecting adjacent straight pipe sections 5, and a temperature regulating jacket 4 located outside the straight pipe sections 15.

[0018] The bend section 15 has an inflection point and a side cleaning short pipe 7 is provided at the inlet section. The side cleaning short pipe 7 is tangentially connected to the outer edge of the inflection point. A control valve 14 close to the bend section 15 is provided on the side cleaning short pipe 7. A flow meter 6 is provided at the outlet end of the straight pipe section 5. The outlet pipe of the circulating pump 13 is also connected to the inlet pipe of the buffer tank 9. The top of the buffer tank 9 is provided with a material receiving pipe 8 extending to its bottom. A pressurized feeding assembly is provided between the upper end of the material receiving pipe 8 and the side cleaning short pipe 7.

[0019] In this embodiment, the pressurized feeding assembly includes a booster pump and a pressurized pump connected to the outlet pipe of the booster pump. The inlet pipe of the booster pump is connected to the upper end of the feed pipe 8, and the outlet pipe of the pressurized pump is connected to the inlet of the side cleaning short pipe 7. The discharge port of the polymerization reactor 1 is equipped with a discharge valve 12, the inlet end of the pipeline reactor is equipped with a circulation control valve 11, and the front end of the inlet pipe of the buffer tank 9 is equipped with a storage control valve 10. The side wall of the polymerization reactor 1 is equipped with a heat exchange jacket.

[0020] Working principle:

[0021] 1. When in use, the raw materials are put into the polymerization reactor 1 and initially mixed under the stirring of the stirring mechanism 2, and initially reacted under the temperature regulation of the heat exchange jacket.

[0022] 2. Open the discharge valve 12 and the circulation control valve 11. The material is sent to the pipeline reactor through the circulation pump 13. It continues to mix and react in the pipeline reactor and then returns to the polymerization kettle 1 from the pipeline reactor. This cycle continues. During this process, the reaction temperature is adjusted by the temperature control jacket 4.

[0023] 3. When the flow meter 6 at the outlet of the first straight pipe section 5 detects that the flow rate is lower than the set range, the circulation pump 13 increases its speed. When another flow meter 6 detects that the flow rate is lower than the set range, it indicates that there may be a problem of sticky material blockage at the front bend pipe section 15. Connect the pressurized feeding assembly between the side cleaning short pipe 7 and the material receiving pipe 8, start the lifting pump and the pressurizing pump, pressurize the material pre-stored in the buffer tank 9 and send it to the side cleaning short pipe 7. Open the control valve 14. After the material is pressurized, it passes through the side cleaning short pipe 7 and impacts the bend pipe section 15 where it is located, cleaning the bend pipe section and achieving the purpose of timely cleaning of sticky material.

[0024] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A polymerization reactor for PVC resin production, comprising a polymerization kettle, a circulating pump connected to the bottom discharge port of the polymerization kettle, a pipeline reactor connected to the outlet pipe of the circulating pump, and a circulation port located at the top of the polymerization kettle and connected to the end of the pipeline reactor, wherein the pipeline reactor consists of multiple straight pipe sections, bends connecting adjacent straight pipe sections, and a temperature regulating jacket located outside the straight pipe sections, characterized in that: The bend has an inflection point and a side cleaning short pipe is provided at the inlet section. The side cleaning short pipe is tangentially connected to the outer edge of the inflection point. A control valve close to the bend is provided on the side cleaning short pipe. A flow meter is provided at the outlet end of the straight pipe section. The outlet pipe of the circulating pump is also connected to the inlet pipe of the buffer tank. The top of the buffer tank is provided with a material receiving pipe extending to its bottom. A pressurized feeding assembly is provided between the upper end of the material receiving pipe and the side cleaning short pipe.

2. The polymerization reactor for PVC resin production according to claim 1, characterized in that: The pressurized feeding assembly includes a booster pump and a pressurized pump connected to the outlet pipe of the booster pump. The inlet pipe of the booster pump is connected to the upper end of the material receiving pipe, and the outlet pipe of the pressurized pump is connected to the inlet of the side cleaning short pipe.

3. The polymerization reactor for PVC resin production according to claim 1, characterized in that: The polymerization reactor is equipped with a discharge valve at its discharge port, the pipeline reactor is equipped with a circulation control valve at its inlet end, and the buffer tank is equipped with a storage control valve at the front end of its inlet pipeline.

4. The polymerization reactor for PVC resin production according to claim 1, characterized in that: The side wall of the polymerization reactor is provided with a heat exchange jacket.

Images