Continuous production process for silicone oil

A production process, technology of silicone oil, applied in the field of continuous production process of silicone oil, can solve the problem that indicators such as volatile content and acid value flash point cannot be guaranteed, properties such as high flash point and low volatile content cannot be guaranteed, and molecular weight Wide distribution and other issues, to achieve the effect of good appearance and color, superior performance and short residence time

Active Publication Date: 2013-01-30
江苏梅兰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This batch production not only has small production capacity, high energy consumption, long cycle, and cumbersome operation, but also has a wide molecular weight distribution, low quality, unstable quality, and indicators such as volatile matter, acid value, and flash point cannot be guaranteed. The product is only suitable for ordinary markets with low quality requirements
"Organosilicon Synthesis Technology and Product Application" (Xing Songmin, Wang Yilu, Chemical Industry Press, 2000.09, P375-376) introduces two continuous synthesis processes of silicone oil, but they also have some shortcomings, such as using bottom-up The fixed-bed reactor with low reaction efficiency and small production capacity; using the traditional low boiler removal tower, the performance of high flash point and low volatile content of the product cannot be guaranteed

Method used

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  • Continuous production process for silicone oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Mix 1350kg hexamethyldisiloxane and 3150kg octamethylcyclotetrasiloxane evenly in the batching kettle after metering; 100kg of catalysts were added in each, and 2000kg of mixed raw materials were added to Reactor 1 at one time, and the compressor was turned on for nitrogen bubbling and stirring, and the reaction was carried out for 3 hours; then the mixed raw materials were continuously sent into the reactor at a flow rate of 350kg / h The primary reaction is carried out in 1, and the reactants are then overflowed through the intermediate tank of the primary reaction to the reactor 2 to continue the reaction. 2. The product that comes out is filtered through a primary coarse filter and a secondary fine filter to remove solid impurities. The mesh size of the coarse filter is 60um, and the mesh size of the fine filter is 5um; then the filtered product is sent to Scraper-type thin-film evaporator and short-path distiller carry out two-stage delowering treatment...

Embodiment 2

[0014] Embodiment 2: Mix 450kg hexamethyldisiloxane and 4050kg octamethylcyclotetrasiloxane evenly in the batching kettle after metering; 75kg of catalysts were added in each, and 1500kg of mixed raw materials were added to reactor 1 at one time, and the compressor was turned on for nitrogen bubbling and stirring, and the reaction was carried out for 4 hours; then the mixed raw materials were continuously sent into the reactor at a flow rate of 300kg / h The first-order reaction is carried out in 1, and the reactants are then overflowed through the intermediate tank of the first-order reaction to continue the reaction in reactor 2. The top pressure of equilibrium polymerization reactor 1 and 2 is 0.04MPa, and the reaction temperature is 75°C; The product that comes out is filtered through a primary coarse filter and a secondary fine filter to remove solid impurities. The mesh size of the coarse filter is 60um, and the mesh size of the fine filter is 5um; then the filtered product...

Embodiment 3

[0015] Example 3: 135kg of hexamethyldisiloxane and 4365kg of octamethylcyclotetrasiloxane were metered and mixed uniformly in the batching kettle; Add 160kg of catalyst in each, and add 2000kg of mixed raw materials into reactor 1 at one time, turn on the compressor to carry out nitrogen bubbling and stirring, and react for 3 hours; then continuously send the mixed raw materials into the reactor at a flow rate of 280kg / h The primary reaction is carried out in 1, and the reactants continue to react in the reactor 2 through the overflow through the intermediate tank of the primary reaction. The product that comes out is filtered through a primary coarse filter and a secondary fine filter to remove solid impurities. The mesh size of the coarse filter is 60um, and the mesh size of the fine filter is 5um; then the filtered product is sent to the scraper The plate thin film evaporator and short path distiller carry out two-stage delowering treatment to obtain the product silicone...

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Abstract

The present invention discloses a continuous production process for silicone oil. The continuous production process comprises: (1) measuring raw materials through a measurement tank, and uniformly mixing the raw materials in a material preparation kettle to obtain a mixed raw material, wherein the raw materials comprise an organosilicon capping agent and cyclic siloxane; (2) adding a catalyst to an equilibrium polymerization reactor I with nitrogen compression cycle stirring and a reactor II, adding 1500-2000 kg of the mixed raw material from the step (1) to the reactor I in one time, opening a compressor to carry out nitrogen bubbling stirring, and continuously conveying the mixed raw material to the reactor I to carry out a primary reaction; (3) conveying the reactant from the primary reaction to the reactor II through an overflow manner to carry out continuous reaction; (4) carrying out two-stage filtration on the product from the reactor II through a primary coarse filter and a secondary precision filter to remove solid impurities; and (5) conveying the filtered product to a scraper-type thin film evaporator and a short path distiller to carry out a two-stage low removing treatment to obtain the silicone oil product.

Description

technical field [0001] The invention relates to a continuous production process of silicone oil. Background technique [0002] Organosilicon is a new functional chemical material with excellent performance and uniqueness. It is used in various fields of national defense, national economy and even people's daily life. It belongs to the industrial category encouraged by the state. At present, the development of organic silicon products, which are widely used downstream in China, is not fully developed. The technology and market of high-end high-value-added products are monopolized by foreign companies and far behind the market demand, especially the high-performance silicone oil that dominates. Rely on imports. [0003] Silicone oil is a linear or branched polyorganosiloxane obtained by hydrolysis and polycondensation of two functional groups or two functional groups and monofunctional monomers. It is a colorless and transparent oily liquid, non-flammable, non-corrosive to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C08G77/08
Inventor 王昌尧代生华朱剑华陈明伍华胜高永宝
Owner 江苏梅兰化工有限公司
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