Device for preparing electronic-grade polypropylene carbonate

Abstract

The utility model relates to a device for preparing electronic-grade polypropylene carbonate. The device comprises a material drying system, a catalyst drying system, a polymerization reaction system, a purification and precipitation system and a solvent cleaning system, the material drying system is connected with the catalyst drying system and the solvent cleaning system; the catalyst drying system is connected with the polymerization reaction system which is connected with the purification and precipitation system. The device disclosed by the utility model has the beneficial effects that the device can be used for realizing continuous production from pretreatment of raw materials, drying of a catalyst, polymerization reaction, purification and precipitation to a system cleaning process, and the device is perfect; the whole electronic-grade polypropylene carbonate synthesis reaction device can be sealed in the whole polymerization process, so that the reliability and the performance of a product prepared by the device are greatly improved; in consideration of the influence of a catalyst on the performance of the electronic-grade polypropylene carbonate, a purification and precipitation tank and a stirring device are designed in the purification and precipitation system. The device can recycle the solvent and is suitable for large-scale industrial production.

Description

Technical Field

[0001] The utility model belongs to the technical field of polypropylene carbonate preparation, and in particular relates to a device for preparing electronic-grade polypropylene carbonate. Background Art

[0002] Polypropylene carbonate is a completely degradable and environmentally friendly plastic synthesized from carbon dioxide and propylene oxide. Compared with traditional petroleum-based plastics, its decomposition products are only water and carbon dioxide, and it will not release other chemicals that are harmful to the environment. It is an environmentally friendly polymer material, and it uses carbon dioxide as a raw material, which is in line with the concept of sustainable development. Polypropylene carbonate has good processing properties and chemical stability, and can be widely used in various fields, such as packaging materials, electronic component packaging, medical devices, coatings, adhesives, solid electrolytes, etc. In the field of electronics, polypropylene carbonate can be used as a packaging material for electronic components. Its high insulation and chemical stability can effectively protect electronic components and improve working stability and reliability. Because polypropylene carbonate decomposes during the sintering process and leaves no residue, it is used as a sacrificial material in the ceramic industry. Because polypropylene carbonate has the characteristics of low sodium content, it is suitable for the preparation of dielectric materials and piezoelectric ceramics and other electrical ceramic materials. Therefore, the synthesis of electronic grade polypropylene carbonate is of far-reaching significance, and electronic grade polypropylene carbonate has a good application prospect.

[0003] The application of electronic grade polypropylene carbonate in the electronics industry requires the material to have extremely high purity and stability, so its preparation process has high requirements. In order to ensure the high purity and stability of the final product, high-purity raw materials are usually used in the preparation of electronic grade polypropylene carbonate. However, the polypropylene carbonate raw material will come into contact with the outside world during the feeding process, and the moisture in the air entering the polymerization device will affect the subsequent reaction process. At the same time, the moisture in the catalyst is also an important factor affecting the reaction process. The synthesized polypropylene carbonate contains impurities such as catalysts, which will affect the electrical properties and service life of the material. Although the preparation process of electronic grade polypropylene carbonate has made certain progress, it still faces some challenges, such as the above-mentioned influence of moisture on the reaction process, the influence of impurities such as catalysts on the performance of polypropylene carbonate, and the discontinuity of the entire synthesis process. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a device for preparing electronic-grade polypropylene carbonate.

[0005] The device for preparing electronic grade polypropylene carbonate comprises: a material drying system, a catalyst drying system, a polymerization reaction system, a purification precipitation system and a solvent cleaning system; the material drying system is connected to the catalyst drying system and the solvent cleaning system; the catalyst drying system is connected to the polymerization reaction system, and the polymerization reaction system is connected to the purification precipitation system;

[0006] The material drying system includes a sealed reactor, the top of which is connected to a material inlet pipe, which is used to introduce epoxy liquid raw materials that are easy to flow under normal temperature into the material drying system; the bottom of the sealed reactor is covered with molecular sieves, which are used to dry the materials; and a filter is provided at the bottom outlet of the sealed reactor;

[0007] The catalyst drying system includes a catalyst drying tank, an inert gas heating device and a color-changing silica gel gas path; the moisture indicator filled in the color-changing silica gel gas path is one of color-changing silica gel, blue gel indicator and cobalt-free color-changing silica gel;

[0008] A polymerization reaction system, including a polymerization reaction kettle body, a kettle cover, an inert gas passage, a pressure relief device, a pressure buffer tank, an interlayer water cooling device and a heating device;

[0009] A purification precipitation system comprises a purification precipitation tank, wherein a stirring device is provided in the purification precipitation tank;

[0010] The solvent cleaning system includes a cleaning solvent tank, a filtration device, a polymerization device and a detachable probe; a solvent feeding pipeline is provided on the top of the cleaning solvent tank, and the solvent feeding pipeline is used to introduce polymer solvents such as tetrahydrofuran, ethyl acetate, dichloromethane and chlorinated hydrocarbons into the cleaning solvent tank; the cleaning solvent tank is provided with an opening, and the opening is connected to the catalyst drying tank.

[0011] Preferably, in the material drying system: a circular feed port is provided on the top of the sealed reactor, and a screw cap is provided on the feed port to seal the feed port; a lower passage pipe is provided at the bottom of the sealed reactor, and a filter is provided on the port of the lower passage pipe facing the molecular sieve side, and the filter is used to prevent the molecular sieve from falling into the lower passage pipe.

[0012] Preferably, in the catalyst drying system: the inert gas heating device is specifically a vertical gas heater, a heating switch is provided on the vertical heater, an inert gas inlet and an inert gas outlet are respectively provided on the sides of the vertical gas heater, the inert gas inlet is at a low position, and the inert gas outlet is at a high position; the inert gas cylinder is connected to the inert gas inlet on the vertical gas heater, the inert gas outlet on the vertical gas heater is connected to the gas inlet at the lower position of the side of the catalyst drying tank, and a gas outlet is provided at the upper position of the side of the catalyst drying tank, and the heated inert gas goes down to the catalyst drying tank. The upper outlet passes through the catalyst drying tank, taking out the moisture in the catalyst, and plays the role of the catalyst in the drying tank; the gas outlet of the catalyst drying tank is connected to the color-changing silica gel gas path filled with a moisture indicator, and a visual window is provided on the color-changing silica gel gas path pipeline, and the visual window is used to observe the moisture content in the gas system coming out of the catalyst drying tank; the catalyst filled in the catalyst drying tank is one of porphyrin metal complexes, rare earth complexes, Schiff base mononuclear or polynuclear metal complexes and β-diimine metal complexes; the inert gas introduced into the inert gas heating device includes carbon dioxide, nitrogen and argon.

[0013] Preferably, in the polymerization reaction system:

[0014] The kettle cover is provided with a feed port for adding raw materials and catalysts; the kettle cover is also provided with an inert gas inlet; the kettle cover is also provided with a solvent inlet, the solvent inlet is connected to the solvent tank, and a pump is provided on the connecting pipeline;

[0015] The discharge port of the polymerization reactor body is connected to the feed port of the purification precipitation tank provided in the purification precipitation system;

[0016] The polymerization reactor is equipped with a corresponding circulating cooling system;

[0017] The polymerization reactor is filled with polymerization raw materials; the polymerization raw materials are carbon dioxide and epoxy monomers;

[0018] An explosion-proof device is reserved at the lid of the polymerization reactor body, and the maximum explosion-proof pressure of the explosion-proof device is 18MPa; the interlayer water cooling device is arranged outside the polymerization reactor body, the lower part of the interlayer water cooling device is the coolant inlet, and the upper part of the interlayer water cooling device is the coolant outlet; the heating device is located outside the polymerization reactor body, and is an electric heating jacket; the interlayer water cooling device and the electric heating jacket cross-wrap the outer surface of the polymerization reactor body;

[0019] The upper end of the inert gas passage is connected to the external inert gas, the lower end is connected to the polymerization reactor body, the side end of the inert gas passage is connected to the pressure relief device, and a switch is provided on the connecting pipe between the inert gas passage and the pressure relief device; the pressure relief device is connected to the pressure buffer tank through the inert gas passage;

[0020] A condensing coil is provided in the pressure buffer tank as a cooling device, and an opening for gas outlet is provided at the top of the pressure buffer tank, which is connected to the waste gas collection system; or an exhaust pipe is provided at the bottom of the pressure buffer tank, which is connected to the waste gas collection system; a liquid discharge port is also provided at the bottom of the pressure buffer tank, and a switch is provided on the liquid discharge port; external inert gas enters the polymerization reactor body through the inert gas passage, and when pressure relief is required during the reaction process or after the reaction is completed, the switch between the inert gas passage and the pressure relief device is opened, and the pressure is relieved by the needle valve on the pressure relief device; the pressure relief device allows the gas in the polymerization reactor body to enter the pressure buffer tank through the inert gas passage, and the gas is cooled by the condensing coil in the pressure buffer tank and then discharged from the top opening of the pressure buffer tank or the exhaust pipe at the bottom into the existing waste gas collection system; after the pressure relief is completed, the liquid in the pressure buffer tank is discharged from the bottom of the buffer tank.

[0021] Preferably, in the solvent cleaning system: the filtration device includes a filtration pipeline and a vacuum pump, the filtration pipeline is connected to one end of the vacuum pump, and the other end of the vacuum pump is connected to an inert gas pipeline, and a three-way switch is provided on the inert gas pipeline; the polymerization device is provided with a feed inlet and a discharge port, and a stirring device is provided in the polymerization device.

[0022] Preferably, in the purification precipitation system: a discharge port is provided at the bottom of the purification precipitation tank; a feed port and a solvent feed port are provided at the top of the purification precipitation tank, and switches are provided on the feed port, the solvent feed port and the discharge port; the solvent feed port is used to introduce polymer purification precipitants such as alcohols, water and aliphatic hydrocarbons into the purification precipitation tank.

[0023] As a preferred embodiment: the lower passage pipeline located at the lower end of the sealed reactor body in the material drying system is divided into two routes, one of which is connected to the catalyst drying tank in the catalyst drying system through a pneumatic diaphragm pump, and the other is connected to the solvent tank in the solvent cleaning system; valve switches are provided on the connecting pipelines between the sealed reactor and the catalyst drying tank, and between the sealed reactor and the solvent tank, for controlling the opening and closing of the connecting pipelines; the pneumatic diaphragm pump is used to pump the liquid dried by the molecular sieve from the sealed reactor into the catalyst drying tank; a catalyst feed passage is provided on the top of the catalyst drying tank, which is responsible for the feeding of the catalyst; the color-changing silica gel filled with moisture indicator in the catalyst drying system is connected to the polymerization reactor body in the polymerization reaction system; the discharge port of the polymerization reactor body is connected to the feed port set on the top of the purification precipitation tank in the purification precipitation system.

[0024] As a preferred embodiment, a visual window is installed on the pipeline where the pneumatic diaphragm pump is located to facilitate observation of the liquid flow.

[0025] As a preferred embodiment: a waste liquid discharge pipe is provided on the cleaning solvent tank; a pipe filter is provided above the waste liquid discharge pipe for filtering the liquid discharged from the solvent cleaning system; a pipe filter is also provided on the connecting pipe between the pressure buffer tank and the polymerization reactor body.

[0026] As a preference:

[0027] The reactor cover of the polymerization reactor is provided with a detachable probe port, and a retractable probe with a light is provided in the detachable probe port; the detachable probe port is sealed and connected with the retractable probe with a light; the polymerization reactor body is also provided with a material temperature sensor, a reactor body temperature sensor and a pressure sensor; the pressure sensor includes a positive pressure sensor and a negative pressure sensor; the maximum pressure that the positive pressure sensor can sense is 20MPa, and the minimum pressure that the negative pressure sensor can sense is -0.1MPa; the polymerization reactor body is equipped with a heating device, and the maximum heating temperature is 350°C;

[0028] The sealed reactor of the material drying system is also provided with a stirring device and an electric heating device, which is used to control the temperature inside the reactor. The upper limit of the temperature control is 200°C. The sealed reactor is made of glass.

[0029] The beneficial effects of the utility model are as follows: the electronic-grade polypropylene carbonate synthesis reaction device designed by the utility model includes a material drying system, a catalyst drying system, a polymerization reaction system, a purification precipitation system and a solvent cleaning system; it can be used to realize continuous production from raw material pretreatment, catalyst drying, polymerization reaction, purification precipitation to system cleaning process, and the device equipment is perfect; the entire electronic-grade polypropylene carbonate synthesis reaction device can be sealed during the entire polymerization process, which greatly improves the reliability and product performance prepared by the device; considering the influence of the catalyst on the performance of electronic-grade polypropylene carbonate, a purification precipitation tank and a stirring device are designed in the purification precipitation system. The device can recycle solvents and is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a module of the electronic grade polypropylene carbonate device of the utility model;

[0031] Figure 2 This is a specific structural diagram of the electronic grade polypropylene carbonate device of the utility model.

[0032] Explanation of the reference numerals: material drying system 1, catalyst drying system 2, polymerization reaction system 3, purification precipitation system 4, solvent cleaning system 5, sealed reactor 6, molecular sieve 7, filter screen 8, catalyst drying tank 9, inert gas heating device 10, color-changing silica gel gas circuit 11, polymerization reactor body 12, reactor cover 13, inert gas passage 14, pressure relief device 15, pressure buffer tank 16, interlayer water cooling device and heating device 17, purification precipitation tank 18, wall scraping mechanical stirring device 19, cleaning solvent tank 20, pneumatic diaphragm pump 21, pipeline filter screen 22, visual window 23, hose 24. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0034] As an example, Figure 1 and Figure 2 As shown, a device for preparing electronic grade polypropylene carbonate comprises: a material drying system, a catalyst drying system, a polymerization reaction system, a purification precipitation system and a solvent cleaning system; the material drying system is connected to the catalyst drying system and the solvent cleaning system; the catalyst drying system is connected to the polymerization reaction system, and the polymerization reaction system is connected to the purification precipitation system;

[0035] The material drying system includes a sealed reactor, the top of which is connected to a material inlet pipe, which is used to introduce epoxy liquid raw materials that are easy to flow under normal temperature into the material drying system; the bottom of the sealed reactor is covered with molecular sieves, which are used to dry the materials; a filter is provided at the bottom outlet of the sealed reactor; in the material drying system: a circular feed port is also provided at the top of the sealed reactor, and a screw cap is provided on the feed port to seal the feed port; a lower passage pipe is provided at the bottom of the sealed reactor, and a filter is provided on the port of the lower passage pipe facing the molecular sieve, and the filter is used to prevent the molecular sieve from falling into the lower passage pipe;

[0036] The catalyst drying system includes a catalyst drying tank, an inert gas heating device and a color-changing silica gel gas path; the moisture indicator filled in the color-changing silica gel gas path is one of color-changing silica gel, blue gel indicator and cobalt-free color-changing silica gel; in the catalyst drying system: the inert gas heating device is specifically a vertical gas heater, a heating switch is provided on the vertical heater, an inert gas inlet and an inert gas outlet are respectively provided on the sides of the vertical gas heater, the inert gas inlet is at a low position, and the inert gas outlet is at a high position; the inert gas cylinder is connected to the inert gas inlet on the vertical gas heater, and the inert gas outlet on the vertical gas heater is connected to the gas outlet at the lower position on the side of the catalyst drying tank. The inlet and the upper side of the catalyst drying tank are provided with a gas outlet, and the heated inert gas enters from the bottom and exits from the top through the catalyst drying tank, taking out the moisture in the catalyst and playing the role of the catalyst in the drying tank; the gas outlet of the catalyst drying tank is connected to the color-changing silica gel gas path filled with a moisture indicator, and a visual window is provided on the color-changing silica gel gas path pipeline, and the visual window is used to observe the moisture content in the gas system coming out of the catalyst drying tank; the catalyst filled in the catalyst drying tank is one of porphyrin metal complexes, rare earth complexes, Schiff base mononuclear or polynuclear metal complexes and β-diimine metal complexes; the inert gas introduced into the inert gas heating device includes carbon dioxide, nitrogen and argon;

[0037] The polymerization reaction system includes a polymerization reaction kettle, a kettle cover, an inert gas passage, a pressure relief device, a pressure buffer tank, an interlayer water cooling device and a heating device; in the polymerization reaction system:

[0038] The kettle cover is provided with a feed port for adding raw materials and catalysts; the kettle cover is also provided with an inert gas inlet; the kettle cover is also provided with a solvent inlet, the solvent inlet is connected to the solvent tank, and a pump is provided on the connecting pipeline;

[0039] The discharge port of the polymerization reactor body is connected to the feed port of the purification precipitation tank provided in the purification precipitation system;

[0040] The polymerization reactor is equipped with a corresponding circulating cooling system;

[0041] The polymerization reactor is filled with polymerization raw materials; the polymerization raw materials are carbon dioxide and epoxy monomers;

[0042] An explosion-proof device is reserved at the lid of the polymerization reactor body, and the maximum explosion-proof pressure of the explosion-proof device is 18MPa; the interlayer water cooling device is arranged outside the polymerization reactor body, the lower part of the interlayer water cooling device is the coolant inlet, and the upper part of the interlayer water cooling device is the coolant outlet; the heating device is located outside the polymerization reactor body, and is an electric heating jacket; the interlayer water cooling device and the electric heating jacket cross-wrap the outer surface of the polymerization reactor body;

[0043] The upper end of the inert gas passage is connected to the external inert gas, the lower end is connected to the polymerization reactor body, the side end of the inert gas passage is connected to the pressure relief device, and a switch is provided on the connecting pipe between the inert gas passage and the pressure relief device; the pressure relief device is connected to the pressure buffer tank through the inert gas passage;

[0044] The pressure buffer tank is provided with a condensing coil as a cooling device, and an opening for gas outlet is provided at the top of the pressure buffer tank, and the opening is connected to the waste gas collection system; or an exhaust pipe is provided at the bottom of the pressure buffer tank, and the exhaust pipe is connected to the waste gas collection system; a liquid discharge port is also provided at the bottom of the pressure buffer tank, and a switch is provided on the liquid discharge port; the external inert gas enters the polymerization reactor body through the inert gas passage, and when pressure relief is required during the reaction process or after the reaction is completed, the switch between the inert gas passage and the pressure relief device is opened, and the pressure is relieved by the needle valve on the pressure relief device; the pressure relief device allows the gas in the polymerization reactor body to enter the pressure buffer tank through the inert gas passage, and the gas is cooled by the condensing coil in the pressure buffer tank and then discharged from the top opening of the pressure buffer tank or the exhaust pipe at the bottom into the existing waste gas collection system; after the pressure relief is completed, the liquid in the pressure buffer tank is discharged from the bottom of the buffer tank;

[0045] The reactor cover of the polymerization reactor is provided with a detachable probe port, and a retractable probe with a light is provided in the detachable probe port; the detachable probe port is sealed and connected with the retractable probe with a light; the polymerization reactor body is also provided with a material temperature sensor, a reactor body temperature sensor and a pressure sensor; the pressure sensor includes a positive pressure sensor and a negative pressure sensor; the maximum pressure that the positive pressure sensor can sense is 20MPa, and the minimum pressure that the negative pressure sensor can sense is -0.1MPa; the polymerization reactor body is equipped with a heating device, and the maximum heating temperature is 350°C;

[0046] The purification precipitation system comprises a purification precipitation tank, wherein a stirring device is arranged in the purification precipitation tank; in the purification precipitation system: a discharge port is arranged at the bottom of the purification precipitation tank; a feed port and a solvent feed port are arranged at the top of the purification precipitation tank, and switches are arranged on the feed port, the solvent feed port and the discharge port; the solvent feed port is used to introduce polymer purification precipitants such as alcohols, water and aliphatic hydrocarbons into the purification precipitation tank;

[0047] The solvent cleaning system includes a cleaning solvent tank, a filtration device, a polymerization device and a detachable probe; a solvent feed pipeline is provided on the top of the cleaning solvent tank, and the solvent feed pipeline is used to introduce polymer solvents such as tetrahydrofuran, ethyl acetate, dichloromethane and chlorinated hydrocarbons into the cleaning solvent tank; the cleaning solvent tank is provided with an opening, and the opening is connected to the catalyst drying tank; a waste liquid discharge pipeline is provided on the cleaning solvent tank; a pipeline filter is provided above the waste liquid discharge pipeline, which is used to filter the liquid discharged from the solvent cleaning system; a pipeline filter is also provided on the connecting pipeline between the pressure buffer tank and the polymerization reaction kettle body; in the solvent cleaning system: the filtration device includes a filtration pipeline and a vacuum pump, the filtration pipeline is connected to one end of the vacuum pump, and the other end of the vacuum pump is connected to the inert gas pipeline, and a three-way switch is provided on the inert gas pipeline; a feed port and a discharge port are provided on the polymerization device, and a stirring device is provided in the polymerization device;

[0048] The lower passage pipeline located at the lower end of the sealed reactor body in the material drying system is divided into two routes, one of which is connected to the catalyst drying tank in the catalyst drying system through a pneumatic diaphragm pump, and the other is connected to the solvent tank in the solvent cleaning system; valve switches are provided on the connecting pipelines between the sealed reactor and the catalyst drying tank, and between the sealed reactor and the solvent tank, for controlling the opening and closing of the connecting pipelines; the pneumatic diaphragm pump is used to pump the liquid dried by the molecular sieve from the sealed reactor into the catalyst drying tank; a catalyst feed passage is provided on the top of the catalyst drying tank, which is responsible for the feeding of the catalyst; the color-changing silica gel filled with moisture indicator in the catalyst drying system is connected to the polymerization reactor body in the polymerization reaction system through a gas path; the discharge port of the polymerization reactor body is connected to the feed port set on the top of the purification precipitation tank in the purification precipitation system; a visual window is installed on the pipeline where the pneumatic diaphragm pump is located, which is convenient for observing the flow of liquid; a stirring device is also provided in the sealed reactor of the material drying system, and an electric heating device is provided in the sealed reactor, which is used to regulate the temperature in the reactor body, and the upper limit of the temperature regulation is 200°C; the sealed reactor is made of glass.

Claims

1. A device for preparing electronic grade polypropylene carbonate, characterized in that: include: Material drying system, catalyst drying system, polymerization reaction system, purification precipitation system and solvent cleaning system; the material drying system is connected to the catalyst drying system and the solvent cleaning system; The catalyst drying system is connected to the polymerization reaction system, and the polymerization reaction system is connected to the purification precipitation system; The material drying system includes a sealed reactor, the top of which is connected to a material inlet pipeline; the bottom of the sealed reactor is covered with molecular sieves; and a filter is provided at the bottom outlet of the sealed reactor; The catalyst drying system includes a catalyst drying tank, an inert gas heating device and a color-changing silica gel gas path; A polymerization reaction system, including a polymerization reaction kettle body, a kettle cover, an inert gas passage, a pressure relief device, a pressure buffer tank, an interlayer water cooling device and a heating device; A purification precipitation system comprises a purification precipitation tank, wherein a stirring device is provided in the purification precipitation tank; The solvent cleaning system comprises a cleaning solvent tank, a filtration device, a polymerization device and a detachable probe; a solvent feeding pipeline is arranged on the top of the cleaning solvent tank; an opening is arranged in the cleaning solvent tank, and the opening is connected to the catalyst drying tank.

2. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: In the material drying system: a feed port is provided on the top of the sealed reactor, and a screw cap is provided on the feed port; a lower passage pipe is provided at the bottom of the sealed reactor, and a filter is provided on the port of the lower passage pipe facing the molecular sieve, and the filter is used to prevent the molecular sieve from falling into the lower passage pipe.

3. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: In the catalyst drying system: the inert gas heating device is specifically a vertical gas heater, which is provided with a heating switch. The sides of the vertical gas heater are respectively provided with an inert gas inlet and an outlet, the inert gas inlet is at a low position, and the inert gas outlet is at a high position; the inert gas cylinder is connected to the inert gas inlet on the vertical gas heater, the inert gas outlet on the vertical gas heater is connected to the gas inlet at the lower position of the side of the catalyst drying tank, and a gas outlet is provided at the upper position of the side of the catalyst drying tank; the gas outlet of the catalyst drying tank is connected to the color-changing silica gel gas path filled with a moisture indicator, and a visual window is provided on the color-changing silica gel gas path pipeline.

4. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: In the polymerization system: The kettle cover is provided with a feed port; the kettle cover is also provided with an inert gas inlet; the kettle cover is also provided with a solvent inlet, the solvent inlet is connected to the solvent tank, and a pump is provided on the connecting pipeline; The discharge port of the polymerization reactor body is connected to the feed port of the purification precipitation tank provided in the purification precipitation system; The polymerization reactor is equipped with a corresponding circulating cooling system; The polymerization reactor is filled with polymerization raw materials; An explosion-proof device is reserved at the lid of the polymerization reactor; a sandwich water cooling device is arranged outside the polymerization reactor, a coolant inlet is provided below the sandwich water cooling device, and a coolant outlet is provided above the sandwich water cooling device; a heating device is located outside the polymerization reactor, and is an electric heating jacket; the sandwich water cooling device and the electric heating jacket cross-wrap the outer surface of the polymerization reactor; The upper end of the inert gas passage is connected to the external inert gas, the lower end is connected to the polymerization reactor body, the side end of the inert gas passage is connected to the pressure relief device, and a switch is provided on the connecting pipe between the inert gas passage and the pressure relief device; the pressure relief device is connected to the pressure buffer tank through the inert gas passage; The pressure buffer tank is provided with a condensing coil as a cooling device, and an opening for gas outlet is provided at the top of the pressure buffer tank, and the opening is connected to the exhaust gas collection system; or an exhaust pipe is provided at the bottom of the pressure buffer tank, and the exhaust pipe is connected to the exhaust gas collection system; the pressure buffer tank is also provided with a liquid discharge port at the bottom, and a switch is provided on the liquid discharge port.

5. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: In the solvent cleaning system: the filtration device includes a filtration pipeline and a vacuum pump, the filtration pipeline is connected to one end of the vacuum pump, and the other end of the vacuum pump is connected to the inert gas pipeline; the polymerization device is provided with a feed inlet and a discharge port, and a stirring device is provided in the polymerization device.

6. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: In the purification precipitation system: a discharge port is arranged at the bottom of the purification precipitation tank; a feed port and a solvent feed port are arranged at the top of the purification precipitation tank, and switches are arranged on the feed port, the solvent feed port and the discharge port.

7. The device for preparing electronic grade polypropylene carbonate according to any one of claims 1 to 6, characterized in that: The lower passage pipeline located at the lower end of the sealed reactor body in the material drying system is divided into two routes, one of which is connected to the catalyst drying tank in the catalyst drying system through a pneumatic diaphragm pump, and the other is connected to the solvent tank in the solvent cleaning system; valve switches are provided on the connecting pipelines between the sealed reactor and the catalyst drying tank, and between the sealed reactor and the solvent tank; a catalyst feed passage is provided on the top of the catalyst drying tank; the color-changing silica gel filled with moisture indicator in the catalyst drying system is connected to the polymerization reactor body in the polymerization reaction system; the discharge port of the polymerization reactor body is connected to the feed port arranged on the top of the purification precipitation tank in the purification precipitation system.

8. The device for preparing electronic grade polypropylene carbonate according to claim 7, characterized in that: A visual window is installed on the pipeline where the pneumatic diaphragm pump is located to facilitate observation of liquid flow.

9. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: A waste liquid discharge pipe is arranged on the cleaning solvent tank; a pipe filter is arranged above the waste liquid discharge pipe; and a pipe filter is also arranged on the connecting pipe between the pressure buffer tank and the polymerization reactor body.

10. The device for preparing electronic grade polypropylene carbonate according to claim 1, characterized in that: The reactor cover of the polymerization reactor is provided with a detachable probe port, and a retractable probe with a light is provided in the detachable probe port; the detachable probe port is sealed and connected with the retractable probe with a light; the polymerization reactor body is also provided with a material temperature sensor, a reactor body temperature sensor and a pressure sensor; the pressure sensor includes a positive pressure sensor and a negative pressure sensor; the polymerization reactor body is equipped with a heating device, and the maximum heating temperature is 350°C; The sealed reactor of the material drying system is also provided with a stirring device, and the sealed reactor is provided with an electric heating device; the sealed reactor is made of glass.

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