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A method for delowering molecular weight of low-viscosity silicone oil

A low-viscosity silicone oil, de-lowering technology, applied in the direction of separation methods, molecular distillation, chemical instruments and methods, etc., can solve the problems that cannot meet high requirements, the effect of silicone oil de-bottoming molecules is not complete, etc., to achieve low volatile matter, de-lowering Efficiency improvement and energy saving effect

Active Publication Date: 2022-04-26
浙江中天东方氟硅材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the incomplete molecular effect of silicone oil removal in the prior art, which cannot meet high-demand applications, the purpose of the present invention is to provide a method for removing low-molecular weight silicone oil with low viscosity, so as to efficiently remove low-molecular weight silicone oil. And reduce the temperature required for the delowering process

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  • A method for delowering molecular weight of low-viscosity silicone oil
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  • A method for delowering molecular weight of low-viscosity silicone oil

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Embodiment 1

[0029] A method for delowering low-viscosity silicone oil, the delowering device used is a falling film evaporator, including the following process: evaporating the semi-finished product of dimethyl silicone oil (light component content 9.2±0.05%) that has been polymerized from the falling film The top of the evaporator is fed into the hopper, the feed valve is controlled so that the material slowly flows into the heating device, the temperature of the heating system is controlled at 180°C, the distance between the condensation surface of the falling film evaporator and the heating surface is 10mm, and the vacuum environment pressure in the entire device is 0.8 Pa, the surface of the heating surface is provided with oblique downward spiral stripes, the silicone oil is distributed from the top of the falling film evaporator to the heating surface, and forms a liquid film with a thickness of 0.05mm downward along the stripes on the heating surface. The light components in the fil...

Embodiment 2

[0031] A method for delowering low-viscosity silicone oil, the delowering device used is a falling film evaporator, including the following process: evaporating the semi-finished product of dimethyl silicone oil (light component content 9.2±0.05%) that has been polymerized from the falling film The top of the evaporator is fed into the hopper, the feed valve is controlled so that the material slowly flows into the heating device, the temperature of the heating system is controlled at 170 ° C, the distance between the condensation surface of the falling film evaporator and the heating surface is 20mm, and the vacuum environment pressure in the entire device is 0.8 Pa, the surface of the heating surface is provided with oblique downward spiral stripes, the silicone oil is distributed from the top of the falling film evaporator to the heating surface, and flows downward along the stripes on the heating surface to form a liquid film with a thickness of 0.08mm. The light components ...

Embodiment 3

[0033]A method for delowering low-viscosity silicone oil, the delowering device used is a falling film evaporator, including the following process: evaporating the semi-finished product of dimethyl silicone oil (light component content 9.2±0.05%) that has been polymerized from the falling film The top of the evaporator is fed into the hopper, the feed valve is controlled so that the material slowly flows into the heating device, the temperature of the heating system is controlled at 120 ° C, the distance between the condensation surface of the falling film evaporator and the heating surface is 30 mm, and the vacuum environment pressure in the entire device is 1.0 Pa, the surface of the heating surface is provided with oblique downward spiral stripes, the silicone oil is distributed from the top of the falling film evaporator to the heating surface, and flows downward along the stripes on the heating surface to form a liquid film with a thickness of 0.1mm. The light components i...

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Abstract

The invention relates to the technical field of silicone oil de-lowering technology. Aiming at the problem that the molecular effect of silicone oil de-bottling in the prior art is not complete and cannot meet the high requirements of application, a method for de-lowering the molecular weight of low-viscosity silicone oil is disclosed. Using the principle of molecular distillation, the de-lowering molecular The heating part in the low-device system is close to the condensing part, and the silicone oil flows into the heating area from the hopper, forming a thin liquid film and flowing downward under a specific action. Under the action of high vacuum, the low boiling group in the silicone oil will Molecules will escape from the liquid surface. Since the condensation surface is very close to the heating surface, the escaped low-boiling component molecules will touch the condensation surface without collision and condense into a liquid to be collected. It flows downward along the heating surface, and after being collected, the finished product of de-lowered silicone oil can be obtained. The volatile content of the silicone oil can be removed to less than 1% or even lower, and the required heating temperature is lowered, so that the silicone oil can avoid irritating odor.

Description

technical field [0001] The invention relates to the technical field of removing silicone oil, in particular to a method for removing bottom molecules of low-viscosity silicone oil. Background technique [0002] Silicone oil delowering is the process of separating the volatile components with a lower boiling point in silicone oil, that is, light components, such as ring bodies and some short-chain line bodies, from silicone oil. The more raw material components of silicone oil, the more complicated its delowering operation. The process of delowering directly affects the volatile content and flash point of silicone oil, which has a crucial impact on the quality of silicone oil. In order to achieve as low a volatile content as possible, the delowering of silicone oil is often carried out at a higher temperature. In the production process of silicone oil, the energy consumed in the process of delowering accounts for more than half of the entire production process. [0003] Tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/12B01D3/00B01D5/00C08G77/34
CPCB01D3/008B01D3/12B01D5/0003B01D5/006C08G77/34Y02P20/50
Inventor 祝林刚陈荣雄席先锋邵向东杨庆红田春
Owner 浙江中天东方氟硅材料股份有限公司