Efficient low-viscosity dimeticone removing method and device

Abstract

The invention relates to the technical field of silicone oil low-molecular-weight removal, in particular to an efficient low-molecular-weight removal method and device for low-viscosity dimeticone, the method provides a method for removing low molecules from silicone oil based on multi-stage evaporation and gas stripping, low molecules are primarily removed from low-viscosity dimeticone through a scraper evaporator, most of low-molecular-weight components in the silicone oil are removed, and the low-molecular-weight components in the silicone oil are removed. The obtained dimeticone semi-finished product is subjected to nitrogen blowing for secondary removal of low molecules, the obtained oil-gas mixture is subjected to short-path rectification operation for deep removal of low molecules, and the content of volatile components in the obtained dimeticone finished product can be lower than 0.2%. The device comprises the scraper evaporator, the intermediate tank and the short-path evaporator, an inlet in the bottom of the intermediate tank is fixedly communicated with a nitrogen pipeline, gas-liquid balance is destroyed through nitrogen blowing, the migration and diffusion efficiency of the low molecules is enhanced, the scraper evaporator and short-path rectification are combined for use, and the low-molecule removal efficiency is improved. The efficient removal of the low molecules in the low-viscosity dimeticone is realized.

Description

Technical Field

[0001] The invention relates to the technical field of silicone oil degassing, in particular to a method and a device for efficiently degassing low-viscosity dimethyl silicone oil. Background Art

[0002] Low-viscosity dimethicone, due to its excellent lubricity, chemical stability, and versatility, holds broad application prospects in the cosmetics, industrial lubrication, mold release agents, textile auxiliaries, pharmaceuticals, food, and electronics industries. Low-volatility silicone oils are widely used in high-end applications, such as electronics, optics, aerospace, and medicine, where product stability and reliability are closely linked to the fluid's volatility. The stringent performance requirements of ultra-low volatility silicone oils in these fields are driving a growing market demand for high-purity silicone oils.

[0003] In the silicone oil production process, scraper evaporators are widely used in the industry to remove low-molecular-weight volatiles. They are primarily used to remove low-molecular-weight components from silicone oil, thereby improving its purity. However, for low-viscosity dimethyl silicone oil, due to its low viscosity, the residence time on the scraper evaporator surface is short, which limits the removal of low-molecular-weight components. Especially when preparing ultra-low-volatility silicone oil, traditional scraper evaporation processes struggle to completely remove volatile components, resulting in a high level of residual low-molecular-weight silicone oil in the product. This not only affects the purity and performance of the silicone oil but can also adversely affect product quality and safety in certain applications, such as pharmaceuticals, electronics, and high-end cosmetics.

[0004] A Chinese patent document with authorization publication number CN114015052B discloses a process for removing low molecular weight molecules from silicone oil. In the present invention, the silicone oil to be treated is heated to a temperature that meets the removal requirements, and then the heated silicone oil is output in equal amounts. Each output portion of silicone oil is sprayed into each series-connected removal device in sequence to remove low molecular weight molecules. Although the heated area of the silicone oil semi-finished product is increased during the removal process, thereby enhancing the removal effect, this invention only discloses a method for continuously removing small and medium molecules from silicone oil. However, its effect is limited to the treatment of low-viscosity dimethyl silicone oil.

[0005] The Chinese patent document with the authorization announcement number CN103642045B discloses a method for efficiently removing low-molecular-weight silicone oil from low-viscosity silicone oil, a method for efficiently removing low-molecular-weight silicone oil using a two-stage separation process of a common vacuum separation system and a high vacuum separation system. After removing most of the low-molecular-weight silicone oil in the common vacuum separation system, the residual low-molecular-weight silicone oil is further removed by the high vacuum separation system. This method uses a two-stage separation system to improve the effect of removing low-molecular-weight silicone oil. Due to the low viscosity of the silicone oil, the residence time in the falling film is very short, and the vacuum degree and heat source temperature of the equipment are highly dependent. As the viscosity of the silicone oil decreases, the removal processing capacity is very small, and it is difficult to meet the higher requirements for ultra-low volatile silicone oil. Moreover, when the silicone oil is removed from the high vacuum separation system, its evaporation surface is still limited by Henry's law. In order to obtain silicone oil with a low residual volatile matter, its heating temperature is high, resulting in a limited removal effect. Therefore, this method is not suitable for the removal of easily cracked silicone oil at high temperatures.

[0006] Therefore, it is very necessary to research and develop a method and device for efficiently removing low-viscosity dimethyl silicone oil to more efficiently and accurately remove low-molecular volatiles and achieve industrial production of high-quality ultra-low volatile silicone oil. Summary of the Invention

[0007] The present invention provides a method and device for efficiently removing low-molecular-weight silicone oil from low-viscosity dimethyl silicone oil, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing scraper evaporation process is difficult to completely remove volatile components in the removal of low-molecular-weight silicone oil from low-viscosity dimethyl silicone oil, resulting in a high content of low-molecular-weight silicone oil in the product.

[0008] One of the technical solutions of the present invention is achieved by the following measures: a method for efficiently removing low-viscosity dimethicone oil is carried out according to the following method: In the first step, the low-viscosity dimethyl silicone oil to be treated is passed through a scraper evaporator to preliminarily remove low molecular weight components to obtain a dimethyl silicone oil semi-finished product; In the second step, nitrogen is blown into the dimethyl silicone oil semi-finished product to obtain an oil-gas mixture; The third step is to subject the oil and gas mixture to short-range distillation to deeply remove low molecular weight substances and obtain the finished product of dimethyl silicone oil.

[0009] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The viscosity of the above low viscosity dimethicone oil is 0.65mm 2 / s to 50mm 2 / s, the volatile matter volume content in low viscosity dimethicone is 15% to 20%.

[0010] The operating temperature in the above-mentioned preliminary removal of low molecular weight materials is 160° C. to 180° C., the operating pressure is -100 kPa to -98 kPa, the inlet flow rate of the low-viscosity dimethicone oil to be treated is 0.1 t / h to 1 t / h, and the volume content of volatile matter in the obtained dimethicone semi-finished product is less than 1.5%.

[0011] The nitrogen gas injected is high-purity nitrogen gas with a purity of 99.9%.

[0012] In the above-mentioned operation of blowing nitrogen into the dimethyl silicone oil semi-finished product, the blowing flow rate of nitrogen is 1Nm 3 / h to 5Nm 3 / h.

[0013] In the above-mentioned deep removal of low molecular weight molecules, the equipment for short-path distillation operation is a short-path evaporator, the short-path distillation operation temperature is 160°C to 180°C, the short-path distillation operation pressure is -100kPa to -98kPa, and the volume content of volatile matter in the obtained dimethyl silicone oil product is less than 0.2%.

[0014] The second technical solution of the present invention is achieved through the following measures: a device for implementing a high-efficiency degassing method for low-viscosity dimethyl silicone oil, comprising a scraper evaporator, an intermediate tank, and a short-path evaporator, wherein the scraper evaporator inlet is fixedly connected to a first silicone oil delivery pipeline, a second silicone oil delivery pipeline is fixedly connected between the first outlet at the lower part of the scraper evaporator and the upper inlet of the intermediate tank, a third silicone oil delivery pipeline is fixedly connected between the outlet of the intermediate tank and the inlet of the short-path evaporator, a nitrogen pipeline is fixedly connected to the bottom inlet of the intermediate tank, and a finished silicone oil delivery pipeline is fixedly connected to the lower outlet of the short-path evaporator.

[0015] The following is a further optimization and / or improvement of the second technical solution of the above invention: The above also includes a first condenser, a second condenser, and a low-molecular-weight collector. A first low-molecular-weight pipeline is fixedly connected between the top outlet of the scraper evaporator and the inlet of the first condenser, a second low-molecular-weight pipeline is fixedly connected between the top outlet of the first condenser and the first inlet of the low-molecular-weight collector, a third low-molecular-weight pipeline is fixedly connected between the top outlet of the short-path evaporator and the inlet of the second condenser, and a fourth low-molecular-weight pipeline is fixedly connected between the top outlet of the second condenser and the second inlet of the low-molecular-weight collector.

[0016] The first silicone oil delivery pipeline, the finished silicone oil delivery pipeline, and the nitrogen pipeline are respectively fixedly provided with a first flow meter, a second flow meter, and a third flow meter, the scraper evaporator is fixedly provided with a first thermometer and a first vacuum gauge, the intermediate tank is fixedly provided with a remote pressure gauge, and the short-path evaporator is fixedly provided with a second thermometer and a second vacuum gauge.

[0017] The above also includes a PLC controller, and the first flow meter, the second flow meter, the third flow meter, the first thermometer, the first vacuum gauge, the remote pressure gauge, the second thermometer, and the second vacuum gauge are all connected to the PLC controller.

[0018] The present invention addresses the problem of saturated vapor pressure limitation in the process of removing low-molecular-weight silicone oil from low-viscosity silicone oil. A nitrogen stripping method is introduced into the method for removing low-molecular-weight silicone oil from low-viscosity silicone oil. By blowing in nitrogen, the gas-liquid equilibrium is destroyed, and the migration and diffusion efficiency of the low-molecular-weight silicone oil is significantly enhanced. A scraper evaporator and a short-path evaporator are then used in combination to give full play to the preliminary low-molecular-weight removal capability of the scraper evaporator and the high-efficiency deep separation capability of the short-path evaporator, thereby improving the removal efficiency of low-molecular-weight silicone oil from low-viscosity silicone oil and the purity of the product silicone oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 It is a schematic diagram of the process flow of the present invention.

[0020] The codes in the accompanying drawings are: 1 for scraper evaporator, 2 for intermediate tank, 3 for short-path evaporator, 4 for the first silicone oil delivery pipeline, 5 for the second silicone oil delivery pipeline, 6 for the third silicone oil delivery pipeline, 7 for the nitrogen pipeline, 8 for the finished silicone oil delivery pipeline, 9 for the first condenser, 10 for the second condenser, 11 for the low molecular collector, 12 for the first low molecular pipeline, 13 for the second low molecular pipeline, 14 for the third low molecular pipeline, 15 for the fourth low molecular pipeline, 16 for the second vacuum gauge, 17 for the first flow meter, 18 for the second flow meter, 19 for the third flow meter, 20 for the first thermometer, 21 for the first vacuum gauge, 22 for the remote pressure gauge, and 23 for the second thermometer. DETAILED DESCRIPTION

[0021] The present invention is not limited to the following embodiments; specific implementation methods may be determined based on the technical solutions and actual conditions of the present invention. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all known and commonly used chemical reagents and chemicals in the prior art; and percentages in the present invention are by mass unless otherwise specified.

[0022] The present invention will be further described below in conjunction with the embodiments: Example 1: As shown in the attached Figure 1 As shown, the method for efficiently removing low-viscosity dimethicone oil is carried out according to the following method: In the first step, the low-viscosity dimethyl silicone oil to be treated is passed through a scraper evaporator 1 to preliminarily remove low molecular weight products to obtain a dimethyl silicone oil semi-finished product; In the second step, nitrogen is blown into the dimethyl silicone oil semi-finished product to obtain an oil-gas mixture; The third step is to subject the oil and gas mixture to short-range distillation to deeply remove low molecular weight substances and obtain the finished product of dimethyl silicone oil.

[0023] The present invention adopts a method combining multi-stage evaporation and nitrogen stripping to achieve the purpose of efficiently removing low-molecular-weight volatile components from low-viscosity dimethicone oil.

[0024] Example 2: As an optimization of the above example, the viscosity of the low viscosity dimethicone oil is 0.65 mm 2 / s to 50mm 2 / s, the volatile matter volume content in low viscosity dimethicone is 15% to 20%.

[0025] Example 3: As an optimization of the above embodiment, the operating temperature in the preliminary removal of low molecular weight processes is 160°C to 180°C, the operating pressure is -100kPa to -98kPa, the inlet flow rate of the low-viscosity dimethicone oil to be treated is 0.1t / h to 1t / h, and the volume content of volatile matter in the obtained dimethicone semi-finished product is less than 1.5%.

[0026] As needed, the mechanical stirring action of the scraper evaporator 1 causes the low-viscosity dimethyl silicone oil to form a thin film on the wall surface of the evaporator, thereby increasing the heating area of the silicone oil and reducing the heat transfer resistance. Under the high temperature and vacuum environment of the scraper evaporator 1, most of the low-molecular-weight components in the silicone oil are removed, reducing the volatile matter from the original 15% to 20% to about 1%.

[0027] Example 4: As an optimization of the above example, the nitrogen gas blown in is high-purity nitrogen gas with a purity of 99.9%.

[0028] Example 5: As an optimization of the above example, nitrogen was blown into the dimethyl silicone oil semi-finished product at a nitrogen blowing rate of 1 Nm 3 / h to 5Nm 3 / h.

[0029] In the present invention, after the initial removal of low-molecule substances, the low-molecular-weight components in the dimethicone semi-finished product are low, and the saturated vapor pressure generated is low. It is difficult to achieve a deeper removal of volatiles by simply increasing the temperature or vacuum degree. Therefore, high-purity nitrogen is continuously blown into the dimethicone semi-finished product after the initial removal of low-molecule substances in the scraper evaporator 1. The flow of nitrogen disturbs the gas-liquid interface, destroys the low-molecule gas phase equilibrium on the liquid surface, and accelerates the migration and diffusion of low-molecule substances. This step strengthens the migration process of low-molecule substances from the liquid phase to the gas phase, performs gas stripping on the residual low-molecule substances in the silicone oil, forms a low-concentration gas phase diffusion environment, thereby further removing free low-molecule substances in the silicone oil and greatly improving the removal efficiency of volatile substances.

[0030] Example 6: As an optimization of the above embodiment, in the process of deep removal of low molecular weight molecules, the equipment for short-path distillation operation is a short-path evaporator 3, the short-path distillation operation temperature is 160°C to 180°C, the short-path distillation operation pressure is -100kPa to -98kPa, and the volume content of volatile matter in the obtained dimethyl silicone oil product is less than 0.2%.

[0031] If needed, short-path distillation can be performed in Short-Path Evaporator 3. Leveraging its unique high vacuum and thin-film evaporation characteristics, Short-Path Evaporator 3 further removes residual low-molecular-weight compounds at relatively low operating temperatures, preventing thermal degradation or performance loss of low-viscosity dimethyl silicone oil at high temperatures. Nitrogen stripping, combined with the efficient separation capabilities of Short-Path Evaporator 3, ultimately reduces the volatile content of the silicone oil to below 0.2%, achieving ultra-low volatility.

[0032] Example 7: As shown in the attached Figure 1 As shown, the device for implementing the method for efficiently removing low-viscosity dimethyl silicone oil comprises a scraper evaporator 1, an intermediate tank 2, and a short-path evaporator 3. The inlet of the scraper evaporator 1 is fixedly connected to a first silicone oil delivery pipeline 4, a second silicone oil delivery pipeline 5 is fixedly connected between the first outlet at the lower part of the scraper evaporator 1 and the upper inlet of the intermediate tank 2, a third silicone oil delivery pipeline 6 is fixedly connected between the outlet of the intermediate tank 2 and the inlet of the short-path evaporator 3, a nitrogen pipeline 7 is fixedly connected to the bottom inlet of the intermediate tank 2, and a finished silicone oil delivery pipeline 8 is fixedly connected to the lower outlet of the short-path evaporator 3.

[0033] In the present invention, unless otherwise specified, the equipment and devices used are all publicly known equipment and devices in the art.

[0034] Example 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, it also includes a first condenser 9, a second condenser 10, and a low-molecular-weight collector 11. A first low-molecular-weight pipeline 12 is fixedly connected between the top outlet of the scraper evaporator 1 and the inlet of the first condenser 9, a second low-molecular-weight pipeline 13 is fixedly connected between the top outlet of the first condenser 9 and the first inlet of the low-molecular-weight collector 11, a third low-molecular-weight pipeline 14 is fixedly connected between the top outlet of the short-path evaporator 3 and the inlet of the second condenser 10, and a fourth low-molecular-weight pipeline 15 is fixedly connected between the top outlet of the second condenser 10 and the second inlet of the low-molecular-weight collector 11.

[0035] Example 9: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, the first silicone oil delivery pipeline 4, the finished silicone oil delivery pipeline 8, and the nitrogen pipeline 7 are respectively fixedly provided with a first flowmeter 17, a second flowmeter 18, and a third flowmeter 19, a first thermometer 20 and a first vacuum gauge 21 are fixedly provided on the scraper evaporator 1, a remote pressure gauge 22 is fixedly provided on the intermediate tank 2, and a second thermometer 23 and a second vacuum gauge 16 are fixedly provided on the short-path evaporator 3.

[0036] Example 10: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a PLC controller is also included, and the first flow meter 17, the second flow meter 18, the third flow meter 19, the first thermometer 20, the first vacuum meter 21, the remote pressure gauge 22, the second thermometer 23, and the second vacuum meter 16 are all connected to the PLC controller.

[0037] As needed, the pipelines and equipment of the low-viscosity dimethyl silicone oil efficient degassing device can also be equipped with conventional valves, thermometers and pressure gauges known in the art according to production needs.

[0038] Example 11: The viscosity is 20mm 2 / s, and a low-viscosity dimethicone with a volatile content of 18% was subjected to the following method for removing low-molecular weight: In the first step, the low-viscosity dimethyl silicone oil to be treated is delivered to the scraper evaporator 1 by a delivery pump for preliminary removal of low molecular weight molecules. The operating temperature of the scraper evaporator 1 is controlled to be 160° C. and the operating pressure is -98 kPa. The feed flow rate of the low-viscosity dimethyl silicone oil to be treated is 1 t / h. The low molecular weight molecules are preliminarily removed to obtain a dimethyl silicone oil semi-finished product. In the second step, the semi-finished dimethyl silicone oil was collected into the intermediate tank 2 and the nitrogen flow rate was controlled to 3Nm 3 / h, continuously blowing nitrogen to obtain oil-gas mixture; In the third step, the flow rate of the oil-gas mixture is controlled to 1t / h, and the mixture enters the short-path evaporator 3. The operating temperature of the short-path evaporator 3 is controlled to 160°C and the operating pressure is -98kPa to deeply remove low molecular weight substances. After the deep removal of low molecular weight substances is completed, the volatile matter content in the obtained dimethyl silicone oil product is detected to be 0.18%.

[0039] Example 12: The difference from Example 11 is that the nitrogen flow rate is 4 Nm 3 / h, after deep removal of low molecular weight, the volatile matter content of the obtained dimethicone finished product was detected to be 0.14%.

[0040] Example 13: The difference from Example 11 is that the nitrogen flow rate is 5Nm 3 / h, after deep removal of low molecular weight, the volatile matter content of the obtained dimethicone finished product was detected to be 0.13%.

[0041] Example 14: The viscosity is 50mm 2 / s and a low-molecular-weight dimethicone with a volatile matter content of 15% was subjected to the method of Example 11 for removing low-molecular-weight substances. The difference from Example 11 was that, in the first step, the operating temperature of the scraper evaporator 1 was controlled to be 180° C., and the operating pressure of the scraper evaporator 1 was controlled to be −100 kPa; in the third step, the operating temperature of the short-path evaporator 3 was controlled to be 180° C., and the operating pressure of the short-path evaporator 3 was controlled to be −100 kPa; after the deep removal of low-molecular-weight substances was completed, the volatile matter content of the obtained dimethicone finished product was detected to be 0.09%.

[0042] Example 15: The viscosity is 0.65mm 2 / s, and a low-viscosity dimethicone with a volatile matter content of 19% was subjected to low-molecular-weight removal according to the method of Example 11. The difference from Example 11 was that in the first step, the operating temperature of the scraper evaporator 1 was controlled to be 170°C, and the operating pressure of the scraper evaporator 1 was controlled to be -99 kPa; in the third step, the operating temperature of the short-path evaporator 3 was controlled to be 170°C, and the operating pressure of the short-path evaporator 3 was controlled to be -99 kPa; after the deep removal of low-molecular-weight, the volatile matter content of the obtained dimethicone finished product was detected to be 0.19%.

[0043] Comparative Example 1: The difference from Example 11 is that after the preliminary removal of low molecular weight, the dimethicone semi-finished product is collected in the intermediate tank 2, and no nitrogen bubbling operation is performed. It directly enters the short-path evaporator 3 for deep removal of low molecular weight treatment. After the deep removal of low molecular weight is completed, the volatile matter content in the obtained dimethicone finished product is detected to be 1.0%.

[0044] After the low-molecular-weight components were removed step by step from the low-viscosity dimethicone in Examples 11 to 15 and Comparative Example 1, the volatile matter content in the finished dimethicone was tested. The test results are shown in Table 1. As can be seen from Table 1, nitrogen bubbling treatment was performed before deep removal of low-molecular-weight components from the low-viscosity dimethicone, which significantly reduced the low-molecular-weight content in the finished dimethicone.

[0045] In summary, the present invention utilizes a multi-stage low-molecular weight removal process, enhanced nitrogen stripping, step-by-step optimization, and adaptability to the characteristics of low-viscosity dimethicone. Furthermore, it incorporates nitrogen stripping technology, combines a scraped-surface evaporator with a short-path evaporator, and demonstrates industrial adaptability. This effectively addresses bottlenecks in existing technologies and provides a novel technical approach and process advantages for the preparation of ultra-low-volatile silicone oils.

[0046] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A method for efficiently removing low viscosity dimethicone, characterized in that Proceed as follows: In the first step, the low-viscosity dimethyl silicone oil to be treated is passed through a scraper evaporator to preliminarily remove low molecular weight components to obtain a dimethyl silicone oil semi-finished product; In the second step, nitrogen is blown into the dimethyl silicone oil semi-finished product to obtain an oil-gas mixture; The third step is to subject the oil and gas mixture to short-range distillation to deeply remove low molecular weight substances and obtain the finished product of dimethyl silicone oil.

2. low-viscosity dimethicone efficient degassing method according to claim 1, it is characterized in that The viscosity of low viscosity dimethicone is 0.65mm 2 / s to 50mm 2 / s, the volume content of volatile matter in low viscosity dimethicone is 15% to 20%.

3. The method for efficiently removing low viscosity dimethicone according to claim 1 or 2, wherein the The operating temperature in the process of removing low molecular weight materials is 160°C to 180°C, the operating pressure is -100kPa to -98kPa, the inlet flow rate of the low-viscosity dimethyl silicone oil to be treated is 0.1t / h to 1t / h, and the volume content of volatile matter in the obtained dimethyl silicone oil semi-finished product is less than 1.5%.

4. according to claim 1 or 2 or 3 described low viscosity dimethicone efficient dehydration method, it is characterized in that The nitrogen gas blown in is high-purity nitrogen with a purity of 99.9%.

5. according to claim 1 or 2 or 3 or 4 described low viscosity dimethicone efficient degassing method, it is characterized in that When nitrogen is blown into the semi-finished product of dimethyl silicone oil, the blowing rate of nitrogen is 1Nm 3 / h to 5Nm 3 / h.

6. according to claim 1 or 2 or 3 or 4 or 5 described low viscosity dimethicone efficient degassing method, it is characterized in that In the process of deep removal of low molecular weight molecules, the equipment for short-path distillation operation is a short-path evaporator, the operating temperature of short-path distillation is 160°C to 180°C, the operating pressure of short-path distillation is -100kPa to -98kPa, and the volume content of volatile matter in the obtained dimethyl silicone oil product is less than 0.2%.

7. A device for implementing the method for efficiently removing low-viscosity dimethicone according to any one of claims 1 to 6, characterized in that It includes a scraper evaporator, an intermediate tank, and a short-path evaporator. The scraper evaporator inlet is fixedly connected to a first silicone oil delivery pipeline, the first outlet at the lower part of the scraper evaporator and the upper inlet of the intermediate tank are fixedly connected to a second silicone oil delivery pipeline, the outlet of the intermediate tank and the inlet of the short-path evaporator are fixedly connected to a third silicone oil delivery pipeline, the bottom inlet of the intermediate tank is fixedly connected to a nitrogen pipeline, and the lower outlet of the short-path evaporator is fixedly connected to a finished silicone oil delivery pipeline.

8. Low-viscosity dimethicone oil efficient degassing device according to claim 7, is characterized in that It also includes a first condenser, a second condenser, and a low-molecular-weight collector. A first low-molecular-weight pipeline is fixedly connected between the top outlet of the scraper evaporator and the inlet of the first condenser, a second low-molecular-weight pipeline is fixedly connected between the top outlet of the first condenser and the first inlet of the low-molecular-weight collector, a third low-molecular-weight pipeline is fixedly connected between the top outlet of the short-path evaporator and the inlet of the second condenser, and a fourth low-molecular-weight pipeline is fixedly connected between the top outlet of the second condenser and the second inlet of the low-molecular-weight collector.

9. The low-viscosity dimethicone efficient degassing device according to claim 7 or 8, characterized in that The first silicone oil delivery pipeline, the finished silicone oil delivery pipeline and the nitrogen pipeline are respectively fixedly provided with the first flow meter, the second flow meter and the third flow meter, the scraper evaporator is fixedly provided with the first thermometer and the first vacuum gauge, the intermediate tank is fixedly provided with a remote pressure gauge, and the short-path evaporator is fixedly provided with the second thermometer and the second vacuum gauge.

10. A device for efficiently removing low-viscosity dimethyl silicone oil according to claim 9, characterized in that It also includes a PLC controller, and the first flow meter, the second flow meter, the third flow meter, the first thermometer, the first vacuum meter, the remote pressure gauge, the second thermometer, and the second vacuum meter are all connected to the PLC controller.

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