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Method for preparing dimethyl dichlorosilane through cracking

The technology of dimethyldichlorosilane and methylchlorosilane is applied in the field of preparation of dimethyldichlorosilane, can solve the problems of harsh reaction conditions, high catalyst price and high reaction temperature, and achieves easy reaction, simple process, The effect of high safety

Active Publication Date: 2008-05-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum trichloride can be recycled, and the conversion rate is over 80%, but the reaction temperature is high
[0017] In addition, a composite catalyst of aluminum trichloride and palladium was also reported to improve the conversion rate of high boilers and dimethyldichlorosilane (M 2 ) selectivity, the effect is better, but the price of the catalyst is high, the preparation is difficult, the reaction conditions are harsh, and the high boiler must be separated from the solid residue, otherwise it will easily lead to catalyst poisoning

Method used

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  • Method for preparing dimethyl dichlorosilane through cracking
  • Method for preparing dimethyl dichlorosilane through cracking
  • Method for preparing dimethyl dichlorosilane through cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 100 g of high boilers (see Table 1 for composition), 10 g of concentrated sulfuric acid, and 5 g of aluminum powder were added to the autoclave. Raise the temperature to the reaction temperature. At 220°C, the reaction time is 3-5 hours, and the pressure is maintained at 1.0-2.5 MPa. The composition of the lysate is shown in Table 2. (The product contains part of the boiling point lower than CH 3 HSiCl 2 components, the content is about 3%)

[0037] Table 2 Product Gas Chromatography Analysis

[0038]

Embodiment 2

[0040] Reaction process is the same as embodiment 1, and high boiler is 100g, and concentrated sulfuric acid is 15g, and aluminum powder is 10g, is warming up to reaction temperature, and at 230 ℃, reaction time is 3~5 hours, and pressure is maintained at 1.0~2.5MPa. The composition of the lysate is shown in Table 3. (Contain part boiling point lower than MeHSiCl in the product 2 components, the content is about 3%)

[0041] Table 3 Product Gas Chromatography Analysis

[0042]

Embodiment 3

[0044] The reaction process is the same as in Example 1. The high boiler is 100g, the concentrated sulfuric acid is 20g, and the aluminum powder is 15g. The temperature is raised to the reaction temperature. At 230° C., the reaction time is 3 to 5 hours, and the pressure is maintained at 1.0 to 2.5 MPa. The composition of the lysate is shown in Table 4. (Contain part boiling point lower than MeHSiCl in the product 2 components, the content is about 3%)

[0045] Table 4 Product Gas Chromatography Analysis

[0046]

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Abstract

This invention relates to a method for preparing dimethyl dichlorosilane. The method uses high-boiling-point residues of methyl dichlorosilane synthesis as the raw materials, and prepares dimethyl dichlorosilane with the composite catalyst of concentrated sulfuric acid and Al powder. The method can realize the pyrolysis of high-boiling-point residues at low temperatures, and solve the problem of excess of high-boiling-point residues produced by organosilicon synthesis. The method has such advantages as controllable reaction, simple process and mild reaction conditions.

Description

technical field [0001] The invention relates to a preparation method of silane, in particular to a preparation method of dimethyldichlorosilane. Background technique [0002] With the continuous expansion of the production scale of methyl chlorosilane monomer, the problem of utilization of high boilers accounting for 5% of the monomer composition is becoming more and more serious. At present, high boiling substances are mainly used in the production of silicone waterproofing agents and defoamers. The market capacity is limited, and only about 20% of high boiling substances can be used every year. and security issues, and a large waste of effective resources. [0003] Organic high boilers can be converted into monosilane by thermal cracking and catalytic cracking methods, and the main cracking product is trimethylchlorosilane ((CH 3 ) 3 SiCl), methyltrichlorosilane (CH 3 SiCl 3 ), dimethyldichlorosilane ((CH 3 ) 2 SiCl 2 ) and unreacted high boilers. [0004] US 2 59...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/12
Inventor 王刚王明成张德胜翟荣霞安晓葵王莉鸿周遵石
Owner PETROCHINA CO LTD
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