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Efficient low molecule removal method for low viscosity silicone oil

A low-viscosity silicone oil, high-efficiency technology, applied in the field of high-efficiency de-molecule removal of low-viscosity silicone oil, can solve the problems of affecting products, de-deposition effect, long de-deposition time, etc., to reduce investment costs, ensure product quality, and improve production efficiency. Effect

Active Publication Date: 2014-03-19
YICHANG COLLIN SILICON MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

Disadvantages of this method: long time for de-lowering, low efficiency, high energy consumption, large batch fluctuation of volatile content of the product, not suitable for production expansion, and the volatile content of products adopting this de-lowering method can only be kept at 1%. Left and right; the second is continuous type: the preheater is connected in series with one or more thin film evaporators, and the low molecular weight is removed under the same vacuum system
Therefore, under the same working conditions, the feeding amount of the thin film evaporator and the vacuum degree are in an inversely proportional relationship. In order to ensure the vacuum degree of the system, the feeding amount of the de-lowering has to be reduced, which makes the effective utilization of the equipment low and affects the product de-lowering. Effect

Method used

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  • Efficient low molecule removal method for low viscosity silicone oil
  • Efficient low molecule removal method for low viscosity silicone oil

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Experimental program
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Effect test

Embodiment 1

[0019] The silicone oil semi-finished product is transported from the silicone oil buffer tank 1 to the preheater 3 for preheating through the delivery pump 2, the preheating temperature is controlled at 100°C, and then enters the falling film evaporator 4 for evaporation, the evaporation temperature is controlled at 130°C, and then enters the separation separator 51 to separate, control the heating temperature of separator 51 to be 160°C, control the vacuum degree of ordinary vacuum separation system 5 to be -0.095Mpa, the separated liquid enters thin film evaporator 61 for secondary separation, and controls the temperature of thin film evaporator 61 to be 170°C, the vacuum degree of the high-vacuum separation system 6 is controlled to -0.099Mpa. After the finished silicone oil overflows from the bottom of the thin film evaporator 61, it is cooled by the cooler 7 and enters the product storage tank 8. The separated low molecules are recovered by the first low molecule The bran...

Embodiment 2

[0021] The silicone oil semi-finished product is transported from the silicone oil buffer tank 1 to the preheater 3 for preheating through the delivery pump 2, the preheating temperature is controlled at 130°C, and then enters the falling film evaporator 4 for evaporation, the evaporation temperature is controlled at 170°C, and then enters the separation Separator 51, control the heating temperature of separator 51 to be 180°C, control the vacuum degree of ordinary vacuum separation system 5 to be -0.098Mpa, the separated liquid enters thin film evaporator 61 for secondary separation, and controls the temperature of thin film evaporator 61 to be 220°C, the vacuum degree of the high-vacuum separation system 6 is controlled to -0.101Mpa. After the finished silicone oil overflows from the bottom of the thin film evaporator 61, it is cooled by the cooler 7 and enters the product storage tank 8. The separated low molecules are recovered by the first low molecule The branch and the s...

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Abstract

The invention discloses an efficient low molecule removal method for low viscosity silicone oil, and the method can be used in the silicone oil low molecule removal field. The method provided by the invention adopts a two-stage separation system containing an ordinary vacuum separation system and a high vacuum separation system. Most low molecules are removed in the ordinary vacuum separation system, and low molecules are further removed in the high vacuum separation system so as to make the volatile content less than 0.2%. The two-stage separation system adopts two different vacuum systems, the vacuum degree of the two-stage separation system is ensured and the product volatile content is ensured, thus guaranteeing the product quality. At the same time, the low molecule removal feed amount is greatly improved, thereby enhancing the production efficiency. In addition, in the invention, silicone oil flows from a high temperature region to a low temperature region, thus effectively saving energy consumption and reducing the cost of investment.

Description

technical field [0001] The invention is used in the field of delowering silicone oil, and in particular relates to a high-efficiency delowering method for low-viscosity silicone oil. Background technique [0002] Silicone oil delowering is the process of changing volatile substances, such as rings, from liquid phase to gas phase and separating them. The more raw material components of silicone oil, the more complicated its delowering operation. With the continuous improvement of living standards, people's requirements for the quality of products continue to increase. Now many customers require that the volatile content of silicone oil products be less than 0.5%. Some high-end fields, such as aerospace and pharmaceutical fields, have higher requirements for the volatile content of silicone oil. In the production process of silicone oil, the energy consumed in the delowering process accounts for 60% to 70% of the entire production process. Therefore, the pros and cons of the...

Claims

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Application Information

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IPC IPC(8): C08G77/34
Inventor 冯钦邦吴利民王跃林申士和
Owner YICHANG COLLIN SILICON MATERIAL CO LTD
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