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Method for continuously producing hydrolysates by hydrolyzing methyl chlorosilane in concentrated acid

A technology of hydrolysis of methylchlorosilane and concentrated acid, which is applied in the direction of chemical instruments and methods, chlorine/hydrogen chloride, compounds of group 4/14 elements of the periodic table, etc. Hydrolysis reaction speed and other issues to achieve the effect of improving the recycling rate of chlorine, ensuring the quality of hydrolyzate, and ensuring water consumption

Inactive Publication Date: 2011-08-17
于淑芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]①Under high hydrogen chloride concentration, a layer of hydrogen chloride gas film will be formed on the surface of organochlorosilane particles, making it difficult for water molecules to fully contact with organochlorosilane molecules, thus reducing the Hydrolysis reaction speed
Therefore, reducing the yield also affects the purity of hydrogen chloride gas, which has a certain impact on the synthesis of methyl chloride
[0009]③ Concentrated acid hydrolysis may also produce chlorine-containing linear siloxane at the end, which affects the quality of the hydrolyzate and further affects the quality of subsequent downstream products

Method used

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Effect test

Embodiment 1

[0038] Dimethyldichlorosilane and concentrated acid enter the hydrolysis reactor 1 for hydrolysis reaction. The molar ratio of water to methylchlorosilane in the reaction system is 0.14:1, and part or all of the water can come from the primary phase separator and The acidic aqueous solution (for circulation) of the secondary phase separator, the reaction temperature is controlled at 35°C, the operating pressure is 0.3Mpa, and the residence time is 55 seconds. HCl is discharged from the outlet and can be directly used for the production of methyl chloride. The liquid hydrolyzate is separated by the primary phase separator and the secondary phase separator successively. The oil phase in the upper layer is the acidic hydrolyzate, which enters the steam tower through the interface control, and the acidic aqueous solution in the lower layer enters the hydrolysis through the acid circulation pump and heat exchanger. The reactor is recycled. The molar ratio of the amount of steam us...

Embodiment 2

[0041]Dimethyldichlorosilane, concentrated acid and oil-containing acidic aqueous solution from the phase separator are metered into the packed tower hydrolysis reactor 1 for hydrolysis reaction. The molar ratio of water to methylchlorosilane in the reaction system is 0.14:1. The water in it can partly or all come from the acidic aqueous solution (for recycling) of the primary phase separator and the secondary phase separator. The reaction temperature is controlled at 40°C, the operating pressure is 0.3Mpa, and the residence time is 55 seconds. The upper part of the reactor is released and passed through the condenser demister, and can be directly used for the production of methyl chloride. The liquid hydrolyzate passes through the primary and secondary phase separators, and the oil phase obtained in the upper layer is acidic hydrolyzate, which enters the steam tower through the interface control; the acidic water obtained in the lower layer passes through the circulation pump ...

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Abstract

The invention relates to a method for producing hydrolysates by hydrolyzing methyl chlorosilane in concentrated acid. In the method, methyl chlorosilane and hydrolysates are mixed in an oil-containing acidic water solution separated out through a primary phase separator and a secondary phase separator, are treated by a preheater, and are then moved into a concentrated acid hydrolysis reaction system for cyclic reaction operation; hydrogen chloride generated in the hydrolysis reaction is released from the top of a tower, and is treated by a condenser and a demister to obtain qualified hydrogen chloride gas for chloromethane production; and methyl chlorosilane hydrolysates are treated by four phase separators and one vapor tower to obtain qualified hydrolysates for pyrolysis.

Description

technical field [0001] The invention relates to a hydrolysis process of organosilicon monomer, in particular to a concentrated acid hydrolysis process of methyl chlorosilane. Background technique [0002] Silicone materials are various and ever-changing, mainly divided into four categories: silicone oil, silicone rubber, silicone resin and silane (including silane coupling agent and siliconization reagent). The preparation process of many silicone materials is to first prepare polymethylsiloxane (base polymer) with methyl chlorosilane as raw material, and then introduce other groups such as phenyl, vinyl, chlorophenyl, cyanoalkyl, Fluoroalkyl, etc., so that it has special properties and functions. [0003] Chlorosilane hydrolysis process methods used to be: excess water hydrolysis and azeotropic acid hydrolysis to generate linear polysiloxane and cyclic polysiloxane with hydroxyl groups at the end, that is, hydrolyzate and hydrochloric acid. Because the hydrogen chloride p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/10C07F7/18C01B7/01
Inventor 于淑芳
Owner 于淑芳
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