Automatic preparation and cooling device for mixing method polyvinyl chloride paste resin peroxidation type initiator

Abstract

The utility model relates to the technical field of auxiliary preparation, in particular to an automatic preparation and cooling device for a mixing method polyvinyl chloride paste resin peroxidation type initiator, which comprises a heat exchanger, a preparation tank, a storage tank and a controller, a tube pass inlet of the heat exchanger is fixedly communicated with a first desalted water inlet pipeline, and the preparation tank is provided with a water inlet and a feed port. A second desalted water inlet pipeline is fixedly communicated between a tube pass outlet of the heat exchanger and a water inlet of the preparation tank, a feed port of the preparation tank is fixedly communicated with an initiator feed pipeline, and a first conveying pipeline is fixedly communicated between a lower outlet of the preparation tank and a top inlet of the storage tank. The automatic initiator preparation device is reasonable and compact in structure and convenient to use, automatic preparation can be realized in the whole initiator preparation process, the operation is convenient and fast, the labor intensity and the potential safety hazard of operators are greatly reduced, the stability of the initiator preparation concentration is improved, and the normal operation of the subsequent polyvinyl chloride paste resin polymerization reaction process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of additive preparation, and is an automatic preparation and cooling device for a peroxide initiator of a mixed polyvinyl chloride paste resin. Background Technique

[0002] The production device of the mixed polyvinyl chloride paste resin is mainly divided into an additive process, a polymerization process, a stripping process, a recovery process, a drying process, and a water treatment process according to production performance. Although the production device has been optimized for many years, there are still many manual operation processes in the production device, especially in the additive preparation and addition device, where there are many manual operations by personnel, and there are many safety and quality hazards in the operation process.

[0003] The initiator used in the production of the mixed polyvinyl chloride paste resin is mainly tert-butyl hydroperoxide (concentration 70%). Before use, it needs to be prepared into a 2% aqueous solution of tert-butyl hydroperoxide with demineralized water, and during the reaction process of the polymerization kettle, it is continuously added to the polymerization kettle using a transfer pump to continuously provide free radicals for the polymerization reaction of vinyl chloride monomer and ensure the normal polymerization reaction of vinyl chloride monomer.

[0004] However, the initiator tert-butyl hydroperoxide (concentration 70%) is easily decomposed by heat, and the storage temperature is required to be lower than 28°C. Excessive temperature causes decomposition, which not only harms the physical health of operators, but also reduces the effective concentration after the initiator decomposes, resulting in an extended reaction time of the polymerization kettle, an increase in the amount of initiator used, a decrease in the utilization rate of the polymerization kettle, and an increase in production costs.

[0005] At present, there are the following problems in the initiator preparation process:

[0006] First, the operator needs to manually pour the initiator tert-butyl hydroperoxide into the preparation tank, and then manually open the demineralized water valve and add the formulated amount of water. During the preparation process, due to different operators, there is a measurement deviation in the amount of demineralized water added, resulting in a change in the concentration of the initiator preparation and affecting the reaction time of the polymerization kettle;

[0007] Second, the demineralized water used in the current preparation is directly transported from the demineralized water device in the power plant, and the water temperature is generally 30°C and the highest is 40°C in summer. During the initiator preparation process, due to the too high water temperature, the initiator will be decomposed, resulting in a decrease in the reaction time of the polymerization kettle and the utilization rate of the device;

[0008] Third, during the current initiator preparation process, the operator's on-duty operation time is long, the labor intensity is high, and protective measures need to be worn, which poses a safety risk.

[0009] In short, there are problems such as long operation time, high labor intensity, and unstable preparation concentration in the current initiator preparation process, resulting in difficulties in the normal operation of the polymerization kettle reaction. Summary of the Invention

[0010] The utility model provides an automatic preparation and cooling device for peroxide initiators of blended polyvinyl chloride paste resin, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems that the existing initiator preparation process has long operation time, high labor intensity, unstable preparation concentration, and difficult normal operation of the polymerization kettle reaction.

[0011] The technical solution of the utility model is realized by the following measures: an automatic preparation and cooling device for peroxide initiators of blended polyvinyl chloride paste resin, including a heat exchanger, a preparation tank, a storage tank and a controller. The inlet of the tube side of the heat exchanger is fixedly connected to a first desalted water inlet pipeline. The preparation tank is provided with a water inlet and a feed inlet. A second desalted water inlet pipeline is fixedly connected between the outlet of the tube side of the heat exchanger and the water inlet of the preparation tank. The feed inlet of the preparation tank is fixedly connected to an initiator feed pipeline. A first conveying pipeline is fixedly connected between the lower outlet of the preparation tank and the upper inlet of the storage tank. The lower outlet of the storage tank is fixedly connected to a second conveying pipeline. An electric control valve I is arranged on the second desalted water inlet pipeline, and an electric control valve II is arranged on the initiator feed pipeline. A liquid level detector is arranged on the outer side of the lower part of the storage tank. The controller is electrically connected to the electric control valve I, the electric control valve II and the liquid level detector respectively.

[0012] The following is a further optimization or / and improvement of the above-mentioned technical solution of the utility model:

[0013] An electromagnetic flowmeter I is arranged on the second desalted water inlet pipeline between the electric control valve I and the preparation tank, and an electromagnetic flowmeter II is arranged on the initiator feed pipeline between the electric control valve II and the preparation tank. A concentration detector is arranged on the outer side of the lower part of the preparation tank. An electric control valve III is arranged on the first conveying pipeline. The controller is also electrically connected to the electromagnetic flowmeter I, the electromagnetic flowmeter II, the concentration detector and the electric control valve III respectively.

[0014] The bottom of the storage tank is arranged in an inclined shape with the left side higher than the right side, and a stirrer is arranged on the inner side of the upper part of the preparation tank.

[0015] A feed pump I is arranged on the second conveying pipeline, and standby conveying pipelines are fixedly connected to the second conveying pipeline on the left and right sides corresponding to the feed pump I. A feed pump II is arranged on the standby conveying pipeline.

[0016] A reflux pipeline is fixedly connected between the second conveying pipeline on the right side of the standby conveying pipeline and the upper inlet of the storage tank. An electric control valve IV is arranged on the reflux pipeline, and a pressure transmitter is arranged on the second conveying pipeline on the right side of the reflux pipeline. The controller is also electrically connected to the electric control valve IV and the pressure transmitter respectively.

[0017] A vent pipeline is fixedly connected to the upper outlet of the storage tank.

[0018] The inlet of the shell side of the above heat exchanger is fixedly connected to a cooling water inlet pipeline, and the outlet of the shell side of the heat exchanger is fixedly connected to a cooling water outlet pipeline.

[0019] The structure of the utility model is reasonable and compact, and it is convenient to use. The whole initiator preparation process can realize automatic preparation, with convenient operation, greatly reducing the labor intensity and safety hazards of operators, improving the stability of the initiator preparation concentration, and ensuring the normal operation of the subsequent polyvinyl chloride paste resin polymerization reaction process. Description of the Drawings

[0020] Appendix Figure 1 is a schematic process flow diagram of the utility model.

[0021] Appendix Figure 1 The codes in it are respectively: 1 is a heat exchanger, 2 is a preparation tank, 3 is a storage tank, 4 is a first desalted water inlet pipeline, 5 is a second desalted water inlet pipeline, 6 is an initiator feed pipeline, 7 is a first conveying pipeline, 8 is a second conveying pipeline, 9 is an electric control valve I, 10 is an electric control valve II, 11 is a liquid level detector, 12 is an electromagnetic flowmeter I, 13 is an electromagnetic flowmeter II, 14 is a concentration detector, 15 is an electric control valve III, 16 is a stirrer, 17 is a feed pump I, 18 is a spare conveying pipeline, 19 is a feed pump II, 20 is a reflux pipeline, 21 is an electric control valve IV, 22 is a pressure transmitter, 23 is a vent pipeline, 24 is a cooling water inlet pipeline, and 25 is a cooling water outlet pipeline. Detailed Embodiments

[0022] The utility model is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solution of the utility model and the actual situation.

[0023] In the utility model, unless otherwise specified, the equipment and devices used are the existing well-known and commonly used equipment and devices in the art. For example, the concentration detector, electromagnetic flowmeter and liquid level detector are all existing well-known and commonly used equipment.

[0024] In the utility model, for the convenience of description, the description of the relative position relationship of each component is based on the layout mode of the attached drawings of the specification. For example, the position relationships such as front, back, up, down, left, and right are determined according to the layout direction of the attached drawings of the specification. Figure 1 of the specification. Figure 1 are determined according to the layout direction of the attached drawings of the specification.

[0025] The following describes the utility model in further detail in conjunction with the embodiments and the drawings:

[0026] Embodiment 1: As shown in Appendix Figure 1As shown in the figure, the automatic preparation and cooling device for the peroxide initiator of the blended PVC paste resin includes a heat exchanger 1, a preparation tank 2, a storage tank 3 and a controller. The inlet of the tube side of the heat exchanger 1 is fixedly connected to a first desalted water inlet pipeline 4. The preparation tank 2 is provided with a water inlet and a feed inlet. A second desalted water inlet pipeline 5 is fixedly connected between the outlet of the tube side of the heat exchanger 1 and the water inlet of the preparation tank 2. The feed inlet of the preparation tank 2 is fixedly connected to an initiator feed pipeline 6. A first transfer pipeline 7 is fixedly connected between the lower outlet of the preparation tank 2 and the top inlet of the storage tank 3. The lower outlet of the storage tank 3 is fixedly connected to a second transfer pipeline 8. An electric control valve 9 is provided on the second desalted water inlet pipeline 5. An electric control valve 10 is provided on the initiator feed pipeline 6. A liquid level detector 11 is provided on the outer side of the lower part of the storage tank 3. The controller is electrically connected to the electric control valve 9, the electric control valve 10 and the liquid level detector 11 respectively.

[0027] As a preparation and cooling device for additives, during the whole preparation process of the initiator aqueous solution, the initiator and desalted water can be automatically added to the preparation tank 2 and mixed evenly. The prepared initiator aqueous solution is sent to the storage tank 3 for temporary storage, and then sent from the storage tank 3 to the subsequent polymerization kettle to participate in the reaction, providing free radicals for the normal reaction of the polymerization kettle. The whole initiator preparation process can achieve automatic preparation, with convenient operation, greatly reducing the labor intensity and safety hazards of operators, improving the stability of the initiator preparation concentration, and ensuring the normal operation of the subsequent PVC paste resin polymerization reaction process.

[0028] After the utility model is put into use, it can effectively reduce the temperature of desalted water, avoid the thermal decomposition of the initiator. The usage amount of the initiator drops from 0.6 Kg / t.PVC in the early stage to 0.5 Kg / t.PVC. Due to the stable concentration of the initiator aqueous solution, the reaction time of the polymerization kettle is stable, and the utilization rate of the polymerization kettle is improved. Calculated according to 0.1 Kg of tert-butyl hydroperoxide used per ton of paste resin, 3000 kg of initiator can be saved annually, saving about 83,000 yuan in initiator costs.

[0029] According to actual needs, the above automatic preparation and cooling device for the peroxide initiator of the blended PVC paste resin can be further optimized or / and improved:

[0030] Example 2: The difference from Example 1 is that as shown in the appendix Figure 1 As shown in the figure, an electromagnetic flowmeter 12 is provided on the second desalted water inlet pipeline 5 between the electric control valve 9 and the preparation tank 2. An electromagnetic flowmeter 13 is provided on the initiator feed pipeline 6 between the electric control valve 10 and the preparation tank 2. A concentration detector 14 is provided on the outer side of the lower part of the preparation tank 2. An electric control valve 15 is provided on the first transfer pipeline 7. The controller is also electrically connected to the electromagnetic flowmeter 12, the electromagnetic flowmeter 13, the concentration detector 14 and the electric control valve 15 respectively.

[0031] During use, through the set electromagnetic flowmeter 12 and electromagnetic flowmeter 13, the addition amounts of the initiator and demineralized water can be accurately measured, precisely and quickly; by setting the concentration detector 14, when the concentration in the preparation tank 2 reaches the set value, the control solenoid valve 15 is opened to send the prepared initiator aqueous solution in the preparation tank 2 to the storage tank 3 for temporary storage.

[0032] Example 3: The difference between it and Example 1 and Example 2 is that as shown in the appendix Figure 1 As shown, the bottom of the storage tank 3 is arranged in an inclined shape with the left side higher than the right side, and a stirrer 16 is provided on the inner side of the upper part of the preparation tank 2.

[0033] During use, by arranging the bottom of the storage tank 3 in an inclined shape, it can effectively make the liquid in the storage tank 3 mix uniformly and the concentration stable.

[0034] Example 4: The difference between it and Example 1 to Example 3 is that as shown in the appendix Figure 1 As shown, a feed pump 17 is provided on the second transfer pipeline 8, and a spare transfer pipeline 18 is fixedly connected to the second transfer pipeline 8 on the left and right sides corresponding to the feed pump 17, and a feed pump 19 is provided on the spare transfer pipeline 18.

[0035] During use, by setting the feed pump 17 and the feed pump 19, one is in use and the other is in standby during use to ensure the normal operation of the device.

[0036] Example 5: The difference between it and Example 4 is that as shown in the appendix Figure 1 As shown, a return pipeline 20 is fixedly connected between the second transfer pipeline 8 on the right side of the spare transfer pipeline 18 and the top inlet of the storage tank 3. An electromagnetic control valve 21 is provided on the return pipeline 20, and a pressure transmitter 22 is provided on the second transfer pipeline 8 on the right side of the return pipeline 20. The controller is also electrically connected to the electromagnetic control valve 21 and the pressure transmitter 22 respectively.

[0037] During use, when the pressure transmitter 22 detects that the pressure on the second transfer pipeline 8 is higher than the set value, the electromagnetic control valve 21 on the return pipeline 20 is opened, and the initiator aqueous solution is sent to the storage tank 3 through the second transfer pipeline 8 and the return pipeline 20 to stabilize the pressure.

[0038] Example 6: The difference between it and Example 1 to Example 5 is that as shown in the appendix Figure 1 As shown, an air release pipeline 23 is fixedly connected to the top outlet of the storage tank 3.

[0039] During use, the set air release pipeline 23 is used to prevent the storage tank 3 from being pressurized and ensure the safe operation of the device.

[0040] Example 7: The difference between it and Example 1 to Example 6 is that as shown in the appendix Figure 1As shown, the inlet of the shell side of the heat exchanger 1 is fixedly connected to the cooling water inlet pipeline 24, and the outlet of the shell side of the heat exchanger 1 is fixedly connected to the cooling water outlet pipeline 25.

[0041] During use, the cooling water provides a cold source for the heat exchanger 1.

[0042] As needed, on each pipeline and equipment of the automatic preparation and cooling device for the peroxide initiator of the mixed-method polyvinyl chloride paste resin, conventional valves, thermometers, pressure gauges, etc. that are well-known and commonly used in the art can also be provided according to production needs. The controller is a DCS controller, and the model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0043] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

[0044] The usage process of the embodiments of the present utility model:

[0045] First, the relatively high-temperature desalted water sent from the front-end desalted water process is sent to the heat exchanger 1 for cooling and standby. When the liquid level detector 11 on the storage tank 3 shows that the liquid level is lower than the set value, the controller controls the opening of the first electric control valve 9, and the cooled desalted water passes through the first desalted water inlet pipeline 4 and is metered by the first electromagnetic flowmeter 12 and then sent to the preparation tank 2. After the addition of desalted water is completed, the first electric control valve 9 is closed, and the second electric control valve 10 is opened. The initiator passes through the initiator feed pipeline 6 and is metered by the second electromagnetic flowmeter 13 and then sent into the preparation tank 2. After the addition of the initiator is completed, the second electric control valve 10 is closed, and the initiator aqueous solution in the preparation tank 2 is mixed evenly by the stirrer 16;

[0046] Then, when the concentration detected by the concentration detector 14 in the preparation tank 2 reaches the set value, the third electric control valve 15 is opened, and the initiator aqueous solution in the preparation tank 2 is sent to the storage tank 3 through the first transfer pipeline 7;

[0047] Finally, the initiator aqueous solution in the storage tank 3 is sent to the subsequent polymerization kettle through the feed pump 17 on the second transfer pipeline 8 to participate in the polymerization reaction and provide free radicals for the normal reaction of the polymerization kettle.

Claims

1. An automatic preparation and cooling device for a mixed polyvinyl chloride paste resin peroxidation initiator, characterized in that The invention comprises a heat exchanger, a preparation tank, a storage tank and a controller. The heat exchanger tube inlet is fixedly connected with a first desalted water inlet pipeline. The preparation tank is provided with a water inlet and a feed inlet. The heat exchanger tube outlet is fixedly connected with a second desalted water inlet pipeline and the preparation tank inlet. The preparation tank feed inlet is fixedly connected with an initiator feed pipeline. The lower outlet of the preparation tank and the top inlet of the storage tank are fixedly connected with a first delivery pipeline. The lower outlet of the storage tank is fixedly connected with a second delivery pipeline. An electric-controlled valve 1 is provided on the second desalted water inlet pipeline. An electric-controlled valve 2 is provided on the initiator feed pipeline. A liquid level detector is provided on the lower outer side of the storage tank. The controller is electrically connected to the electric-controlled valve 1, the electric-controlled valve 2 and the liquid level detector respectively.

2. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 1, characterized in that An electromagnetic flowmeter 1 is provided on the second desalted water inlet pipeline between the electric control valve 1 and the preparation tank, an electromagnetic flowmeter 2 is provided on the initiator feed pipeline between the electric control valve 2 and the preparation tank, a concentration detector is provided on the outer side of the lower part of the preparation tank, an electric control valve 3 is provided on the first conveying pipeline, and the controller is also electrically connected to the electromagnetic flowmeter 1, the electromagnetic flowmeter 2, the concentration detector and the electric control valve 3 respectively.

3. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 1 or 2, characterized in that The bottom of the storage tank is arranged in an inclined shape with the left side higher and the right side lower, and an agitator is arranged on the inner side of the upper part of the preparation tank.

4. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 1 or 2, characterized in that The second conveying pipeline is provided with a feeding pump 1, and the second conveying pipelines corresponding to the left and right sides of the feeding pump 1 are fixedly connected with a spare conveying pipeline, and the spare conveying pipeline is provided with a feeding pump 2.

5. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 3, characterized in that The second conveying pipeline is provided with a feeding pump 1, and the second conveying pipelines corresponding to the left and right sides of the feeding pump 1 are fixedly connected with a spare conveying pipeline, and the spare conveying pipeline is provided with a feeding pump 2.

6. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 4, characterized in that A return pipeline is fixedly connected between the second delivery pipeline on the right side of the spare delivery pipeline and the top inlet of the storage tank. An electric control valve four is arranged on the return pipeline. A pressure transmitter is arranged on the second delivery pipeline on the right side of the return pipeline. The controller is also electrically connected to the electric control valve four and the pressure transmitter respectively.

7. The automatic preparation and cooling device for the peroxidation initiator of the mixed polyvinyl chloride paste resin according to claim 5, characterized in that A return pipeline is fixedly connected between the second delivery pipeline on the right side of the spare delivery pipeline and the top inlet of the storage tank. An electric control valve four is arranged on the return pipeline. A pressure transmitter is arranged on the second delivery pipeline on the right side of the return pipeline. The controller is also electrically connected to the electric control valve four and the pressure transmitter respectively.

8. The automatic preparation and cooling device for the peroxidation initiator of the hybrid polyvinyl chloride paste resin according to claim 1, 2, 5, 6 or 7, characterized in that The top outlet of the storage tank is fixedly connected with a venting pipeline; or / and, the shell side inlet of the heat exchanger is fixedly connected with a cooling water inlet pipeline, and the shell side outlet of the heat exchanger is fixedly connected with a cooling water outlet pipeline.

9. The automatic preparation and cooling device for the peroxidation type initiator of the mixed method polyvinyl chloride paste resin according to claim 3, characterized in that The top outlet of the storage tank is fixedly connected with a venting pipeline; or / and, the shell side inlet of the heat exchanger is fixedly connected with a cooling water inlet pipeline, and the shell side outlet of the heat exchanger is fixedly connected with a cooling water outlet pipeline.

10. The automatic preparation and cooling device for the peroxidation type initiator of the mixed polyvinyl chloride paste resin according to claim 4, characterized in that The top outlet of the storage tank is fixedly connected with a venting pipeline; or / and, the shell side inlet of the heat exchanger is fixedly connected with a cooling water inlet pipeline, and the shell side outlet of the heat exchanger is fixedly connected with a cooling water outlet pipeline.

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