Continuous hydrolysis process of organic dichlorosilane

A technology of dichlorosilane and polyorganosiloxane, applied in the direction of silicon organic compounds, etc., which can solve the problems of inability to obtain hydrogen chloride, difficult handling, and incomplete hydrolysis of alkyl halosilanes

Inactive Publication Date: 2004-07-21
蓝星安迪苏股份有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] USP4609751 describes the use of a static mixer for concentrated acid hydrolysis, that is, the hydrolysis of equivalent water, the alkyl halosilane is not completely hydrolyzed, and the product contains a small amount of Cl-terminated alkylsiloxane, which makes post-processing difficult, and due to the use of alkali Neutralization produces a large amount of waste water
[0005] Chinese patent application 9311087 discloses the hydrolysis method of organodichlorosilane, adding a small amount of alkylsulfonic acid and its alkali metal anionic surfactant during hydrolysis, and improving the environmental protection under the premise of not emulsifying when removing siloxane residual HCl. solid yield, but can not get gaseous hydrogen chloride
In the second step, the crude hydrolyzate is treated with steam at 110°C

Method used

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  • Continuous hydrolysis process of organic dichlorosilane

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Embodiment Construction

[0029] The first stage hydrolysis reaction:

[0030] System pressure control P=0.4mpa (absolute pressure) Reaction temperature T=50℃

[0031] Me 2 SiCl 2Feed 400Kg / h Internal circulation C 1 = 4m 3 / hr External circulation volume C 1 '=1.5m 3 / hr,R 1 =2.67

[0032] C 1 'The hydrochloric acid concentration 45.6% (titration method is measured), the flow 198Kg / hr of gas phase HCl (G),

[0033] S 1 The flow rate is 70.0Kg / hr, and the concentration of hydrochloric acid is 24.6%.

[0034] Flow rate of crude siloxane (L1): 231.5Kg / hr, chlorine content 4.6%, viscosity 4.3mpa.s.

[0035] Second stage hydrolysis reaction:

[0036] System pressure P=0.1mpa (absolute pressure), reaction temperature T=30°C

[0037] L 1 Feed Internal circulation C 2 =2.5m 3 / hr External circulation volume C 2 '=1.0m 3 / hr R 2 =2.5

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Abstract

A continuous hydrolysis process for organic dichlorosilane in order to prepare low-viscosity linear or cyclic organic siloxane includes at least three stages of cyclic hydrolysis reaction system. Each cyclic hydrolysis reaction system includes internal and external cyclic units.

Description

Brief description of the invention [0001] The invention relates to a continuous hydrolysis process of organodichlorosilane, which comprises at least three stages of circulating hydrolysis reaction system, and each stage of circulating hydrolysis reaction system further includes two circulation units: an inner circulation unit and an outer circulation unit. Organodichlorosilane is the main product of organosilicon monomer synthesis, such as dimethyldichlorosilane, and the low-viscosity linear or cyclic organosiloxane prepared by hydrolysis of organodichlorosilane is the main raw material of polyorganosiloxane , it can be used to synthesize silicone oil, silicone rubber, etc., and is widely used in industries such as electronics, daily chemicals, electric power, and building materials. Background of the invention [0002] The hydrolysis process and technology of organodichlorosilane can be found in many published technical information books, for example, W.Noll described in " ...

Claims

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Application Information

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IPC IPC(8): C07F7/02C08G77/04
Inventor 廖洪流徐贱生程红斌郭守涛易有彬陈梅张年运贺志江李江英
Owner 蓝星安迪苏股份有限公司
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