Polydimethylsilane waste liquid recycling device

Abstract

The utility model discloses a kind of polydimethylsilane waste liquid recycling devices, including reaction kettle, digestion kettle, recovery tank and washing kettle, the bottom of reaction kettle is provided with first liquid outlet, the top of digestion kettle is provided with first liquid inlet, first liquid outlet is communicated with first liquid inlet by first material pipe, first liquid outlet pipe is arranged in digestion kettle, the upper end of first liquid outlet pipe is stretched out outside digestion kettle, and form second liquid outlet, the bottom of digestion kettle is also provided with discharge port, the top of recovery tank is provided with second liquid inlet, second liquid outlet is communicated with second liquid inlet by second material pipe, the bottom of recovery tank is provided with third liquid outlet, the top of reaction kettle is also provided with recovery port, third liquid outlet is communicated with recovery port by third material pipe, the top of washing kettle is provided with feed inlet, discharge port is communicated with feed inlet by fourth material pipe, the bottom of washing kettle is provided with the discharge port of discharge material.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid recycling technology, specifically to a polydimethylsilane waste liquid recycling and reuse device. Background Technology

[0002] The industrial production process of polydimethylsilane employs the Wutz reaction. Before the reaction, xylene is added to the reactor as a protective solvent. The reactants are metallic sodium and dichlorodimethylsilane. After the reaction, the mixture contains xylene, unreacted dichlorodimethylsilane, small-molecule polydimethylsilane, residual metallic sodium, and the finished polydimethylsilane. To ensure production safety, the mixture is discharged into a dedicated digestion vessel where 99% anhydrous ethanol is added dropwise to react with the residual dichlorodimethylsilane and metallic sodium. The remaining liquid is then extracted using vacuum filtration and distilled in a distillation vessel to recover xylene and ethanol.

[0003] The above-mentioned recycling process has the following problems: a large amount of small molecule polydimethylsilane that has not completed the chain growth reaction and some unreacted dichlorodimethylsilane are wasted, and the recycling pressure of downstream solvents is increased. Utility Model Content

[0004] The purpose of this invention is to provide a polydimethylsilane waste liquid recycling and reuse device, which can introduce the reaction mixture back into the reaction vessel, make full use of the small molecule polydimethylsilane and dichlorodimethylsilane in the mixture, and allow them to participate in the reaction again, thereby improving the utilization rate of raw materials, increasing product output, reducing waste liquid entering the distillation vessel, and achieving cost reduction and efficiency improvement.

[0005] To achieve the above objectives, the solution of this utility model is: A polydimethylsilane waste liquid recycling device includes a reaction vessel, a digestion vessel, a recovery tank, and a washing vessel. The top of the reaction vessel is connected to a first nitrogen inlet pipe for introducing nitrogen gas, a first tail gas pipe for discharging reaction tail gas, a first liquid inlet pipe for introducing molten sodium and xylene, and a second liquid inlet pipe for introducing dichlorodimethylsilane. The bottom of the reaction vessel has a first outlet for discharging the mixed liquid. The top of the digestion vessel is connected to a second nitrogen inlet pipe for introducing nitrogen gas, a second tail gas pipe for discharging reaction tail gas, and a third liquid inlet pipe for introducing 99% ethanol. The top of the digestion vessel has a first inlet for entering the mixed liquid, and the first outlet is connected to the first inlet via a first material pipe. The digestion vessel also has a first outlet pipe for discharging the upper layer of liquid inside, with the upper end of the first outlet pipe extending outside the digestion vessel to form a second outlet. The bottom of the digestion vessel also has a discharge port for discharging the lower layer of solid powder. The recovery tank... The top of the reactor is connected to a third nitrogen inlet pipe for introducing nitrogen, a third tail gas pipe for discharging reaction tail gas, and a first vacuum pipe for evacuation. The top of the recovery tank is provided with a second liquid inlet for introducing the upper liquid in the digestion vessel, and the second liquid outlet is connected to the second liquid inlet through a second material pipe. The bottom of the recovery tank is provided with a third liquid outlet for discharging small molecule polydimethylsilane and dichlorodimethylsilane. The top of the reactor is also provided with a recovery port for introducing the recovered small molecule polydimethylsilane and dichlorodimethylsilane, and the third liquid outlet is connected to the recovery port through a third material pipe. The top of the washing vessel is connected to a fourth nitrogen inlet pipe for introducing nitrogen, a fourth tail gas pipe for discharging tail gas, and a fourth liquid inlet pipe for introducing washing liquid. The top of the washing vessel is provided with a feed inlet for introducing the lower solid powder in the digestion vessel, and the discharge port is connected to the feed inlet through a fourth material pipe. The bottom of the washing vessel is provided with a discharge port for discharging materials.

[0006] The top of the reactor is equipped with a first pressure gauge for detecting the pressure inside the reactor and a first temperature gauge for detecting the temperature inside the reactor.

[0007] A first stirring paddle is vertically installed inside the reactor, and a first motor for driving the first stirring paddle to rotate is installed on the top of the reactor.

[0008] The top of the digestion vessel is equipped with a second pressure gauge for detecting the pressure inside the digestion vessel and a second temperature gauge for detecting the temperature inside the digestion vessel.

[0009] A second stirring paddle is vertically arranged inside the digestion vessel, and a second motor for driving the second stirring paddle to rotate is installed on the outside of the top of the digestion vessel.

[0010] The top of the recovery tank is equipped with a third pressure gauge for detecting the pressure inside the recovery tank, and the inside of the recovery tank is equipped with a first liquid level detector for detecting the liquid level inside the recovery tank.

[0011] A third stirring paddle is vertically arranged inside the washing tank. A third motor for driving the third stirring paddle to rotate is installed on the top of the washing tank. A stainless steel filter screen is arranged inside the washing tank below the third stirring paddle and the discharge port, and a filter cloth is laid on the stainless steel filter screen.

[0012] Valves are respectively provided on the first material pipe, the second material pipe, the third material pipe, the fourth material pipe, the first nitrogen inlet pipe, the first exhaust pipe, the second nitrogen inlet pipe, the second exhaust pipe, the third nitrogen inlet pipe, the third exhaust pipe, the fourth nitrogen inlet pipe, the fourth exhaust pipe, the first liquid inlet pipe, the second liquid inlet pipe, the third liquid inlet pipe, the fourth liquid inlet pipe, the first liquid outlet pipe, and the first vacuum pipe.

[0013] The first material tube, the second material tube, the third material tube, and the fourth material tube are all stainless steel lined with PTFE, and the first liquid outlet tube is an enamel tube.

[0014] It also includes a vacuum buffer tank. The bottom of the washing vessel is provided with a fourth liquid outlet for discharging the liquid inside the washing vessel. The top of the vacuum buffer tank is provided with a second vacuum tube for evacuating the vacuum and a fifth nitrogen inlet tube for introducing nitrogen gas. The top of the vacuum buffer tank is provided with a third liquid inlet for introducing the liquid inside the washing vessel. The third liquid inlet is connected to the fourth liquid outlet through a fifth material pipe. The top of the vacuum buffer tank is provided with a fourth pressure gauge for detecting the pressure inside the vacuum buffer tank. The vacuum buffer tank is provided with a second liquid level detector for detecting the liquid level inside the vacuum buffer tank. The bottom of the vacuum buffer tank is also connected to a waste liquid pipe.

[0015] With the above structure, the present invention provides a polydimethylsilane waste liquid recycling and reuse device, which adds a recycling tank. The upper liquid (including xylene, small molecule polydimethylsilane and unreacted dichlorodimethylsilane liquid) after reaction in the digester is drawn into the recycling tank through vacuum. After accumulating to a certain volume in the recycling tank, the liquid in the recycling tank is pressed back into the reaction vessel and reacts with the newly added sodium metal mixture and newly added dichlorodimethylsilane to achieve secondary recycling of raw materials. At the same time, the lower particulate material and residual sodium metal in the digester are passed into the washing vessel for cleaning. Finally, the washed particulate material and residual sodium metal are discharged.

[0016] Therefore, the present invention provides a polydimethylsilane waste liquid recycling and reuse device, which can introduce the reaction mixture back into the reaction vessel, make full use of the small molecule polydimethylsilane and dichlorodimethylsilane in the mixture, and allow them to participate in the reaction again, thereby improving the utilization rate of raw materials, increasing product output, reducing waste liquid entering the distillation vessel, and achieving cost reduction and efficiency improvement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a polydimethylsilane waste liquid recycling and reuse device according to the present invention; Figure 2 This is a schematic diagram of the connection structure between the first liquid outlet pipe and the second material pipe in this utility model.

[0018] In the picture: Reactor 1; First nitrogen inlet pipe 11; First exhaust pipe 12; First liquid inlet pipe 13; Second liquid inlet pipe 14; First stirring paddle 15; First motor 16; Digester 2; Second nitrogen inlet pipe 21; Second exhaust pipe 22; Third inlet pipe 23; First outlet pipe 24; Second stirring paddle 25; Second motor 26; 27. Kettle body piping; 3. Recycling tank; Third nitrogen inlet pipe 31; Third exhaust pipe 32; First vacuum tube 33; Washing vessel 4; Fourth nitrogen inlet pipe 41; Fourth exhaust pipe 42; Fourth inlet pipe 43; Third agitator 44; Third motor 45; Stainless steel filter screen 46; First material pipe 5; Second material pipe 6; Third material pipe 7; First liquid level detector 8; Fourth material pipe 9; Vacuum buffer tank 10; Second vacuum tube 101; Fifth nitrogen inlet tube 102; Fifth material pipe 103; waste liquid pipe 104. Detailed Implementation To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0019] A device for recycling and reusing polydimethylsilane waste liquid, such as Figures 1-2As shown, the reactor includes a reaction vessel 1, a digestion vessel 2, a recovery tank 3, and a washing vessel 4. The top of the reaction vessel 1 is connected to a first nitrogen inlet pipe 11 for introducing nitrogen gas, a first tail gas pipe 12 for discharging reaction tail gas, a first liquid inlet pipe 13 for introducing molten sodium metal and xylene, and a second liquid inlet pipe 14 for introducing dichlorodimethylsilane. The bottom of the reaction vessel 1 is provided with a first outlet for discharging the mixture (containing xylene, unreacted dichlorodimethylsilane, small molecule polydimethylsilane, residual sodium metal, and finished polydimethylsilane). The top of the reaction vessel 1 is equipped with a first pressure gauge for detecting the pressure inside the reaction vessel 1 and a first temperature gauge for detecting the temperature inside the reaction vessel 1. The probe of the first pressure gauge extends into the reaction vessel 1 to detect the pressure inside. The probe of the first temperature gauge extends into the reaction vessel 1 to detect the temperature inside.

[0020] A first stirring paddle 15 is vertically arranged inside the reactor 1, and a first motor 16 for driving the first stirring paddle 15 to rotate is installed on the top of the reactor 1. The driving method of the first motor 16 and the first stirring paddle 15 is a method known in the art.

[0021] The top of the digestion vessel 2 is connected to a second nitrogen inlet pipe 21 for introducing nitrogen gas, a second tail gas pipe 22 for discharging reaction tail gas, and a third liquid inlet pipe 23 for introducing 99% ethanol. The top of the digestion vessel 2 is provided with a first liquid inlet for the mixed liquid to enter. The first liquid outlet of the reaction vessel 1 is connected to the first liquid inlet through a first material pipe 5, thereby allowing the mixed liquid in the reaction vessel 1 to enter the digestion vessel 2. The connection structure between the first material pipe 5 and the first liquid outlet and the first liquid inlet is a connection structure known in the art, such as using a flange sealing connection.

[0022] The digestion vessel 2 is also equipped with a first outlet pipe 24 for discharging the upper layer of liquid. The upper end of the first outlet pipe 24 extends outside the digestion vessel 2, forming a second outlet. The bottom of the digestion vessel 2 is also equipped with a discharge port for discharging the lower layer of solid powder. After the mixed liquid enters the digestion vessel 2, it is allowed to stand for a period of time. The lower part of the digestion vessel 2 contains precipitated granular material and residual metallic sodium, while the middle and upper layers contain xylene, small-molecule polydimethylsilane, and unreacted dichlorodimethylsilane liquid. The top of the digestion vessel 2 is equipped with a second pressure gauge for detecting the pressure inside the digestion vessel 2 and a second temperature gauge for detecting the temperature inside the digestion vessel 2. The probe of the second pressure gauge extends into the digestion vessel 2 to detect the pressure inside. The probe of the second temperature gauge extends into the digestion vessel 2 to detect the temperature inside.

[0023] A second stirring paddle 25 is vertically installed inside the digestion vessel 2. A second motor 26 for driving the second stirring paddle 25 to rotate is installed on the top of the digestion vessel 2. The driving method of the second motor 26 and the second stirring paddle 25 is a method known in the art. The lower end of the first liquid outlet pipe 24 is 10~15 cm away from the second stirring paddle 25.

[0024] The top of the recovery tank 3 is connected to a third nitrogen inlet pipe 31 for introducing nitrogen, a third tail gas pipe 32 for discharging reaction tail gas, and a first vacuum pipe 33 for evacuating. The top of the recovery tank 3 is provided with a second liquid inlet for introducing the upper liquid in the digestion vessel 2. The second liquid outlet of the digestion vessel 2 is connected to the second liquid inlet through a second material pipe 6. The connection structure between the second material pipe 6 and the second liquid outlet and the second liquid inlet is a connection structure known in the art, such as using a flange connection. Specifically, a first flange joint is provided at one end of the first outlet pipe 24 corresponding to the second outlet. A vessel body pipe 27 is provided on the lid of the digester 2 for the first outlet pipe 24 to pass through, and a second flange joint is also provided on the vessel body pipe 27. A third flange joint is provided at one end of the second material pipe 6 corresponding to the second outlet. The third flange joint, the first flange joint, and the second flange joint are locked together by fastening bolts, and polytetrafluoroethylene asbestos gaskets are provided between each flange joint, thereby achieving a sealed connection between the second outlet and the second material pipe 6. The pipe connection methods involved in this utility model are similar to the above-described connection methods and will not be described in detail hereafter.

[0025] The bottom of the recovery tank 3 is provided with a third outlet for discharging small molecule polydimethylsilane and dichlorodimethylsilane. The top of the reactor 1 is also provided with a recovery port for introducing the recovered small molecule polydimethylsilane and dichlorodimethylsilane. The third outlet is connected to the recovery port through the third material pipe 7. The connection structure between the third material pipe 7 and the third outlet and the recovery port is a connection structure known in the art, such as using a flange connection.

[0026] A third pressure gauge is installed on the top of the recovery tank 3 to detect the pressure inside the tank. The probe of the third pressure gauge extends into the recovery tank 3 to detect the pressure inside. A first liquid level detector 8 is installed inside the recovery tank 3 to detect the liquid level inside the tank.

[0027] The top of the washing vessel 4 is connected to a fourth nitrogen inlet pipe 41 for introducing nitrogen gas, a fourth tail gas pipe 42 for discharging tail gas, and a fourth liquid inlet pipe 43 for introducing washing liquid (including 95% ethanol, xylene and pure water). The top of the washing vessel 4 is provided with a feed port for introducing the lower layer of solid powder in the digestion vessel 2. The discharge port is connected to the feed port through the fourth material pipe 9. The bottom of the washing vessel 4 is provided with a discharge port for discharging materials.

[0028] A third stirring paddle 44 is vertically arranged inside the washing tank 4, and a third motor 45 for driving the third stirring paddle 44 to rotate is installed on the top of the washing tank 4. The driving method of the third motor 45 and the third stirring paddle 44 is a method known in the art.

[0029] The washing tank 4 is equipped with a stainless steel filter screen 46 located below the third stirring paddle 44 and the discharge port, and a filter cloth is laid on the stainless steel filter screen 46.

[0030] The polydimethylsilane waste liquid recycling device also includes a vacuum buffer tank 10. The bottom of the washing vessel 4 is provided with a fourth outlet for discharging the liquid inside the washing vessel 4. The top of the vacuum buffer tank 10 is provided with a second vacuum pipe 101 for evacuating the vacuum and a fifth nitrogen inlet pipe 102 for introducing nitrogen gas. The top of the vacuum buffer tank 10 is provided with a third inlet for introducing the liquid inside the washing vessel 4, which is connected to the fourth outlet via a fifth material pipe 103. The top of the vacuum buffer tank 10 is provided with a fourth pressure gauge for detecting the pressure inside the vacuum buffer tank 10. A second liquid level detector is provided inside the vacuum buffer tank 10 for detecting the liquid level inside the vacuum buffer tank 10. The bottom of the vacuum buffer tank 10 is also connected to a waste liquid pipe 104. By setting up the vacuum buffer tank 10, the liquid in the washing vessel 4 is vacuum filtered, allowing the washed liquid to be discharged into the vacuum buffer tank 10, while the solid powdery material remains on the stainless steel filter screen 46 inside the washing vessel 4, and is finally discharged from the discharge port under the stirring of the third stirring paddle 44.

[0031] Furthermore, valves are respectively installed on the first material pipe 5, the second material pipe 6, the third material pipe 7, the fourth material pipe 9, the fifth material pipe 103, the first nitrogen inlet pipe 11, the first exhaust pipe 12, the second nitrogen inlet pipe 21, the second exhaust pipe 22, the third nitrogen inlet pipe 31, the third exhaust pipe 32, the fourth nitrogen inlet pipe 41, the fourth exhaust pipe 42, the fifth nitrogen inlet pipe 102, the first liquid inlet pipe 13, the second liquid inlet pipe 14, the third liquid inlet pipe 23, the fourth liquid inlet pipe 43, the first liquid outlet pipe 24, the waste liquid pipe 104, the first vacuum pipe 33, and the second vacuum pipe 101. Vacuum pumps are respectively connected to the first vacuum pipe 33 and the second vacuum pipe 101. Gas sources are respectively connected to the first nitrogen inlet pipe 11, the second nitrogen inlet pipe 21, the third nitrogen inlet pipe 31, the fourth nitrogen inlet pipe 41, and the fifth nitrogen inlet pipe 102.

[0032] Furthermore, the first material pipe 5, the second material pipe 6, the third material pipe 7, the fourth material pipe 9, and the fifth material pipe 103 are all stainless steel lined with PTFE, the first liquid outlet pipe 24 is an enamel pipe, and the other pipes are also pipes known in the art. The first agitator 15 and the second agitator 25 are both anchor-type agitators, and the third agitator 44 is a blade-type agitator.

[0033] In this invention, the reaction vessel 1, digestion vessel 2, recovery tank 3, washing vessel 4, vacuum recovery tank 10, first pressure gauge, second pressure gauge, third pressure gauge, fourth pressure gauge, first thermometer, second thermometer, first liquid level detector 8, and second liquid level detector are all equipment that can be purchased in this field.

[0034] With the above structure, the recycling method based on the polydimethylsilane waste liquid recycling and reuse device includes the following steps: Step 1: Before use, open the first vacuum tube 33 of the recovery tank 3 and draw the pressure to -0.06 MPa. Then close the vacuum and open the third nitrogen inlet tube 31 to replenish the pressure to atmospheric pressure. Repeat this process 3 times, and then fill the tank with nitrogen and maintain the pressure at 0.03 MPa. Step 2: Prepare a mixture of sodium metal and xylene (150 kg sodium metal, 300 L xylene), heat it to 120°C, and prepare another 600 L xylene in reactor 1 and heat it to 108°C. Then, discharge the molten sodium metal and xylene mixture into reactor 1 through the first inlet pipe 13. After the temperature stabilizes at 110°C, start adding dichlorodimethylsilane dropwise through the second inlet pipe 14. Carry out the Wutz reaction under stirring. After the dropwise addition is completed, continue the reaction at 115°C for 24 hours. After the reaction is completed, open the first outlet of reactor 1 and discharge the mixture into the digestion vessel through the first material pipe 5. Step 3: After the mixed liquid enters the digestion vessel 2, let it stand for 1 hour. The lower part of the digestion vessel 2 contains precipitated granular material and residual metallic sodium, while the middle and upper liquid levels contain xylene, small molecule polydimethylsilane, and unreacted dichlorodimethylsilane liquid. Open the second material pipe 6 and simultaneously open the first vacuum pipe 33 to pump the pressure to -0.045 MPa, and finally maintain the pressure in the tank at a slight negative pressure of -0.04 MPa ~ -0.05 MPa. This allows the upper liquid in the digestion vessel 2 to be drawn into the recovery tank 3 through the second material pipe 6. When the first liquid level detector 8 in the recovery tank 3 detects a certain liquid level (e.g., 600 L), the first liquid level detector 8 changes from green to red. Close the second material pipe 6 to stop the liquid inlet, and open the third nitrogen inlet pipe 31 to restore the pressure in the recovery tank 3 to a slight positive pressure of 0.03 MPa, and maintain the pressure. Step 4: After the upper and middle layers of liquid in the digestion vessel 2 are discharged, 99% ethanol is added at a low flow rate through the third inlet pipe 23. Under stirring, the residual metallic sodium and dichlorodimethylsilane are completely reacted into byproducts such as sodium ethoxide, hydrogen, and silicone oil. Then, the fourth material pipe 9 is opened, and the product polydimethylsilane and byproducts are discharged to the washing vessel 4 through the pipe. Step 5: After the material enters the washing tank 4, washing liquid (pure water, 95% ethanol, xylene) is introduced through the fourth inlet pipe 43 according to process requirements. After continuous stirring in the tank for a period of time, impurities such as salt and silicone oil are dissolved and removed. Stirring is then turned off, the second vacuum pipe 101 is opened, and the pressure in the vacuum buffer tank 10 is evacuated to -0.09 MPa. The second vacuum pipe 101 is then closed, and the fifth material pipe 105 of the washing tank 4 is opened. The waste liquid after washing enters the vacuum buffer tank 10 through the filter screen via the fifth material pipe 105. The solid powdered material polydimethylsilane is isolated and retained in the washing tank 4 by the stainless steel filter screen 46. When the second liquid level detector detects that the waste liquid volume in the vacuum buffer tank 10 reaches 80% of its volume, the fifth material pipe 105 is closed, the fifth nitrogen inlet pipe 102 is opened, and nitrogen is introduced to restore atmospheric pressure. The pressure is then replenished to 0.1 MPa. MPa, open the waste liquid pipe 104 to discharge the waste liquid in the vacuum buffer tank 10 to the solvent recovery device (existing equipment), and finally the polydimethylsilane is discharged from the discharge port under stirring; Step 6: When reactor 1 is ready with another 600 L of xylene, open the third material pipe 7 and control the pressure of recovery tank 3 to be maintained at about 0.07 MPa. Force all the liquid in recovery tank 3 into reactor 1. When the pressure in recovery tank 3 drops rapidly, close the third material pipe 7. Step 7: After a new batch of sodium metal and xylene mixture enters reactor 1, the xylene, small molecule polydimethylsilane, and dichlorodimethylsilane remaining from the previous batch will continue to undergo a Wurz reaction with the newly added mixture and the newly added dichlorodimethylsilane. After repeating this process a certain number of times, a sample is taken from recovery tank 3 to test the concentration of dichlorodimethylsilane. When the concentration of dichlorodimethylsilane exceeds 20%, the amount of dichlorodimethylsilane added can be reduced proportionally. This completes the recovery of polydimethylsilane waste liquid.

[0035] Practice has shown that by using the above-mentioned recycling method, all xylene prepared in reactor 1 can be recycled and reused. Each batch can recover 3% to 5% of the raw material dichlorodimethylsilane. After recycling, interference is reduced, and the metallic sodium can react more fully in digestion reactor 2, which greatly reduces the residual metallic sodium content, thereby reducing the consumption of 99% ethanol, reducing the amount of by-products generated, and reducing the amount of washing liquid used. After accumulating a certain number of batches, the amount of 99% ethanol added can be reduced by more than 30%. Relying on this polydimethylsilane waste liquid recycling and reuse device, each production line can reduce the amount of waste liquid recovered by more than 2.1 tons per month.

[0036] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A device for recycling and reusing polydimethylsilane waste liquid, characterized in that: The system includes a reaction vessel, a digestion vessel, a recovery tank, and a washing vessel. The top of the reaction vessel is connected to a first nitrogen inlet pipe for introducing nitrogen gas, a first tail gas pipe for discharging reaction tail gas, a first liquid inlet pipe for introducing molten sodium and xylene, and a second liquid inlet pipe for introducing dichlorodimethylsilane. The bottom of the reaction vessel has a first outlet for discharging the mixture. The top of the digestion vessel is connected to a second nitrogen inlet pipe for introducing nitrogen gas, a second tail gas pipe for discharging reaction tail gas, and a third liquid inlet pipe for introducing 99% ethanol. The top of the digestion vessel has a first liquid inlet for entering the mixture, and the first liquid outlet is connected to the first liquid inlet via a first material pipe. The digestion vessel also has a first liquid outlet pipe for discharging the upper layer of liquid inside, with the upper end of the first liquid outlet pipe extending outside the digestion vessel to form a second liquid outlet. The bottom of the digestion vessel also has a discharge port for discharging the lower layer of solid powder. The top of the recovery tank is connected to... The recovery tank has a third nitrogen inlet pipe for introducing nitrogen, a third tail gas pipe for discharging reaction tail gas, and a first vacuum pipe for evacuating. The top of the recovery tank is equipped with a second liquid inlet for introducing the upper layer liquid in the digestion vessel. The second liquid outlet is connected to the second liquid inlet via a second material pipe. The bottom of the recovery tank is equipped with a third liquid outlet for discharging small molecule polydimethylsilane and dichlorodimethylsilane. The top of the reaction vessel is also equipped with a recovery port for introducing the recovered small molecule polydimethylsilane and dichlorodimethylsilane. The third liquid outlet is connected to the recovery port via a third material pipe. The top of the washing vessel is connected to a fourth nitrogen inlet pipe for introducing nitrogen, a fourth tail gas pipe for discharging tail gas, and a fourth liquid inlet pipe for introducing washing liquid. The top of the washing vessel is equipped with a feed inlet for introducing the lower layer solid powder in the digestion vessel. The discharge port is connected to the feed inlet via a fourth material pipe. The bottom of the washing vessel is equipped with a discharge port for discharging materials.

2. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: The top of the reactor is equipped with a first pressure gauge for detecting the pressure inside the reactor and a first temperature gauge for detecting the temperature inside the reactor.

3. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: A first stirring paddle is vertically installed inside the reactor, and a first motor for driving the first stirring paddle to rotate is installed on the top of the reactor.

4. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: The top of the digestion vessel is equipped with a second pressure gauge for detecting the pressure inside the digestion vessel and a second temperature gauge for detecting the temperature inside the digestion vessel.

5. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: A second stirring paddle is vertically arranged inside the digestion vessel, and a second motor for driving the second stirring paddle to rotate is installed on the outside of the top of the digestion vessel.

6. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: The top of the recovery tank is equipped with a third pressure gauge for detecting the pressure inside the recovery tank, and the inside of the recovery tank is equipped with a first liquid level detector for detecting the liquid level inside the recovery tank.

7. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: A third stirring paddle is vertically arranged inside the washing tank. A third motor for driving the third stirring paddle to rotate is installed on the top of the washing tank. A stainless steel filter screen is arranged inside the washing tank below the third stirring paddle and the discharge port, and a filter cloth is laid on the stainless steel filter screen.

8. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: Valves are respectively provided on the first material pipe, the second material pipe, the third material pipe, the fourth material pipe, the first nitrogen inlet pipe, the first exhaust pipe, the second nitrogen inlet pipe, the second exhaust pipe, the third nitrogen inlet pipe, the third exhaust pipe, the fourth nitrogen inlet pipe, the fourth exhaust pipe, the first liquid inlet pipe, the second liquid inlet pipe, the third liquid inlet pipe, the fourth liquid inlet pipe, the first liquid outlet pipe, and the first vacuum pipe.

9. The polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: The first material tube, the second material tube, the third material tube, and the fourth material tube are all stainless steel lined with PTFE, and the first liquid outlet tube is an enamel tube.

10. A polydimethylsilane waste liquid recycling and reuse device according to claim 1, characterized in that: It also includes a vacuum buffer tank. The bottom of the washing vessel is provided with a fourth liquid outlet for discharging the liquid inside the washing vessel. The top of the vacuum buffer tank is provided with a second vacuum tube for evacuating the vacuum and a fifth nitrogen inlet tube for introducing nitrogen gas. The top of the vacuum buffer tank is provided with a third liquid inlet for introducing the liquid inside the washing vessel. The third liquid inlet is connected to the fourth liquid outlet through a fifth material pipe. The top of the vacuum buffer tank is provided with a fourth pressure gauge for detecting the pressure inside the vacuum buffer tank. The vacuum buffer tank is provided with a second liquid level detector for detecting the liquid level inside the vacuum buffer tank. The bottom of the vacuum buffer tank is also connected to a waste liquid pipe.

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