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Preparation method of dimethyl dimethoxy triacetoxy

A technology of dimethyldimethoxysilane and dimethyldichlorosilane, which is applied in the field of compound preparation, can solve the problems of difficult operation, long process flow, heavy pollution, etc., and achieves reduction of operating cost and change of process flow. The effect of shortening and reducing production costs

Active Publication Date: 2012-09-05
XINYAQIANG SILICON CHEM JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantages of the existing process are: ① two-step alcoholysis method is adopted, the process flow is long, the equipment investment is large, and the operation is not easy to control
②Severe side reactions: mainly because water is generated in the side reactions, which hydrolyzes the raw material dichlorosilane, and at the same time generates a large amount of hydrogen chloride that is difficult to discharge, which aggravates the occurrence of side reactions and causes a vicious circle, resulting in a decrease in yield
③ Due to the produced hydrogen chloride products, the operating environment is poor, the pollution is heavy, and the equipment is severely corroded

Method used

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  • Preparation method of dimethyl dimethoxy triacetoxy
  • Preparation method of dimethyl dimethoxy triacetoxy
  • Preparation method of dimethyl dimethoxy triacetoxy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0025] The preparation of embodiment 1 dimethyldimethoxysilane

[0026] ①Response: first at 1m 3 Put 500kg of dimethyldichlorosilane and 700kg of urea into the enamel stirred tank. Then 500 kg of methanol was added dropwise under stirring, and the addition was required to be completed within 2 hours. The reaction was carried out at -200 mm Hg, and the temperature was controlled at 58° C., and the temperature control was realized by dropping speed or using jacketed cold water to cool down. After the reaction, the stirring was stopped, and the layers were separated for 30 minutes, and the acidic liquid at the bottom was released. The upper crude product is introduced into the neutralization kettle.

[0027] ②Neutralization: Before neutralization, the content of dimethyl-methoxychlorosilane and hydrogen chloride in the crude product should be analyzed to determine the amount of neutralizing agent sodium methoxide added. The amount of sodium methoxide added requires an excess ...

Embodiment 2 2

[0036] The preparation of embodiment 2 dimethyldimethoxysilane

[0037] The steps in the preparation method are the same as in Example 1, except that the amount of raw materials is different, which are respectively: dimethyldichlorosilane 100kg, methanol 48kg; wherein the hydrogen chloride absorbent is a sufficient amount of ammonia; the reaction pressure is -1 mmHg , the temperature is 40°C. In addition, during the neutralization process, the neutralizer is magnesium powder.

Embodiment 3 2

[0038] The preparation of embodiment 3 dimethyldimethoxysilane

[0039] The steps in the preparation method are the same as in Example 1, except that the amount of raw materials is different, which are respectively: 800 kg of dimethyldichlorosilane and 320 kg of methanol; wherein the hydrogen chloride absorbent is a sufficient amount of aluminum; the reaction pressure is -100 mmHg , the temperature is 45°C. In addition, in the neutralization process, the neutralizing agent is sodium.

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Abstract

The invention discloses a preparation method of dimethyl dimethoxy triacetoxy, comprising the following steps of: adding hydrogen chloride absorbent in the reaction of the dimethyl dimethoxy triacetoxy and methanol. The preparation method adopts the hydrogen chloride absorbent, enables the reaction to carry out at normal temperature and the hydrogen chloride concentration in the system to be reduced, thereby avoiding the secondary reaction from generating and ensuring that: (1) the process flow is shortened, the investment is reduced; (2) the reaction is easy to be controlled, and the operation cost is reduced; and (3) the yield is greatly improved, and the product cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of a compound, especially a preparation method of dimethyldimethoxysilane. Background technique [0002] Dimethoxydimethylsilane (Dimethoxydimethylsilane), the molecular formula is C 4 h 12 o 2 Si, molecular weight 120.22; colorless liquid, density 0.8646, boiling point 81-82°C, refractive index 1.369-1.371, flash point -8°C, easy to decompose in water. [0003] Its main uses are: ① chain extender of organic silicon polymer; ② organic silicon resin as a modifier to improve the flexibility of resin; ③ and an important raw material for vinyl head sealant; ④ structure control of silicone rubber compound ⑤It is used to treat the surface of silica, glass fiber, pigment, filler and hygroscopic inorganic compound to improve its water repellency and anti-sticking property. [0004] The existing dimethyldimethoxysilane production process is usually prepared by reacting dimethyldichlorosilane with methanol, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/18
Inventor 初亚军初亚贤初亚玲杨惠权沈毅
Owner XINYAQIANG SILICON CHEM JIANGSU