Method for hydrolyzing methyl phenyl siloxane

A technology of methyl phenyl siloxane and methyl triethoxy silane is applied in the field of hydrolysis of methyl phenyl siloxane, which can solve problems such as environmental pollution, and achieve the advantages of shortening the process, reducing the amount of sewage and improving the quality. Effect

Active Publication Date: 2008-05-21
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the "three wastes" produced by traditional crafts have seriously polluted the environment.

Method used

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  • Method for hydrolyzing methyl phenyl siloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The conversion material of tetramethyltetraphenyltrisiloxane is directly hydrolyzed.

[0027] Add 240 kg of monomethyltriethoxysilane and 120 kg of sodium to 800 kg of toluene, heat up to 105 ° C, then drop 300 kg of chlorobenzene to carry out condensation reaction for 16 hours, and then convert 1460 kg of the obtained conversion material (tetramethyltetraphenyltrisilicon dioxane, sodium ethylate and sodium chloride) to the benzene removal kettle, heat up (temperature≤160°C) to remove toluene, cool to 48°C, transfer the converted material after removing toluene to the hydrolysis kettle, add 800kg of water dropwise, heat up and stir, Hydrolyzed for 10 hours, the temperature was controlled at 105°C. The ethanol produced in the hydrolysis process turns into steam and evaporates at 105°C, and is collected after cooling. Frequently measure the specific gravity of the distillate in the later stage of the hydrolysis reaction. When the specific gravity is 0.992, stop the hydro...

Embodiment 2

[0034] The conversion material of trimethylpentaphenyltrisiloxane is directly hydrolyzed.

[0035] Add 280kg of monomethyltriethoxysilane and 120kg of sodium to 800kg of toluene, raise the temperature to 100°C, then add dropwise 300kg of chlorobenzene to carry out condensation reaction for 16h, and then convert the obtained 1460kg of conversion material (trimethylpentaphenyltrisilicon dioxane, sodium ethylate and sodium chloride) to the benzene removal kettle, heat up (temperature≤160°C) to remove toluene, cool to 48°C, transfer the converted material after removing toluene to the hydrolysis kettle, add 800kg of water dropwise, heat up and stir, Hydrolyzed for 12 hours, the temperature was controlled at 95°C. The ethanol produced in the hydrolysis process turns into steam and evaporates at 95°C, and is collected after cooling. Frequently measure the specific gravity of the distillate in the later stage of the hydrolysis reaction. When the specific gravity is 0.995, stop the h...

Embodiment 3

[0040] The conversion material of trimethylpentaphenyltrisiladioxane is directly hydrolyzed.

[0041]Add 240kg of monomethyltriethoxysilane and 120kg of sodium to 800kg of toluene, raise the temperature to 101°C, then add 300kg of chlorobenzene dropwise to carry out condensation reaction for 17h, and then convert 1460kg of the obtained conversion material (trimethylpentaphenyltrisilicon dioxane, sodium ethylate and sodium chloride) to the benzene removal kettle, heat up (temperature≤160°C) to remove toluene, cool to 48°C, transfer the converted material after removing toluene to the hydrolysis kettle, add 800kg of water dropwise, heat up and stir, Hydrolyzed for 8 hours, the temperature was controlled at 115°C. The ethanol produced in the hydrolysis process turns into steam and evaporates at 105°C, and is collected after cooling. Frequently measure the specific gravity of the distillate in the later stage of the hydrolysis reaction. When the specific gravity is 0.990, stop th...

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Abstract

The present invention provides a method of hydrolyzing methyl phenyl siloxane, comprising the steps that methyl triethoxysilane, chlorobenzene and sodium are processed for the condensation reaction in toluene to obtain a transformation material containing the methyl phenyl siloxane, the toluene of which is removed, water is dripped directly, the temperature is increased to 95 DEG C to 115 DEG C, and the hydrolysis reaction is processed. The method of the present invention considers NaOH produced from the reaction as catalyst. Compared with the traditional method, the method of the present invention can reduce the material loss during the washing process of the transformation material and as well as can shorten the working procedures; the pollution discharge quantity towards the environment is reduced greatly, which is protective to the environment; the quality of hydrolyzing material is improved, which obviously improves the quality of diffusion pump oil produced by the method of the present invention.

Description

technical field [0001] The present invention relates to a method for hydrolyzing siloxane, more particularly, to a method for hydrolyzing methylphenyl siloxane. Background technique [0002] The production of diffusion pump oil products needs to use methylphenylsiloxane as its main reaction raw material. The traditional production route: condensation reaction of monomethyltriethoxysilane, chlorobenzene and metal sodium in toluene to generate methylbenzene Basediethoxysilane, methyldiphenylethoxysilane, sodium chloride, sodium ethylate and a small amount of by-products (referred to as conversion materials); conversion materials add a large amount of water, sodium chloride and sodium ethylate Wash and wash away, these waste waters containing sodium chloride, sodium hydroxide and a large amount of ethanol are discharged directly; Add water and aqueous solution of sodium hydroxide to catalyze hydrolysis reaction to generate methylphenylsilanediol and methyldiphenylsilanol. Afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18
Inventor 蒲文伦冯剑辉吴国相
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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