Preparation method of additive for synthesizing high-selectivity organic silicon monomer

By preparing the additive for synthesis of high-selective silicone monomers, the problem of too low Si8Al6Fe4Ca content in industrial silicon melts is solved, which significantly improves the selectivity and yield of synthesis of silicone monomers, and is suitable for industrial production.

CN119710340APending Publication Date: 2025-03-28KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411927540.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The endogenous content of Si8Al6Fe4Ca in existing industrial silicon melts is too low, resulting in low selectivity for silicone monomer synthesis and low dimethyldichlorosilane yield.

Method used

By powdering and mixing FeSi2Al2Ca intermetallic compounds, heating to 900-920°C and insulated, naturally cooling to form the Si8Al6Fe4Ca phase, a high selective silicone monomer synthesis additive was prepared. The Si8Al6Fe4Ca phase content in this additive is >70%, and it is added to industrial silicon powder to improve the selectivity of silicone monomer synthesis.

Benefits of technology

It significantly improves the selectivity of the silicone monomer synthesis process and the yield of dimethyldichlorosilane, solves the problem that the demand characteristics of industrial silicon refining and industrial silicon for silicone cannot be matched, and has the advantages of high product added value, strong raw material applicability and high production efficiency.

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Abstract

The invention relates to a preparation method of an additive for synthesizing a high-selectivity organic silicon monomer, and belongs to the field of production of organic silicon monomers. The method comprises the following steps: respectively preparing a FeSi2 intermetallic compound and a Si2Al2Ca intermetallic compound by adopting a directional solidification method; the FeSi2 intermetallic compound and the Si2Al2Ca intermetallic compound are subjected to powder preparation and mixed to be uniform, and mixed powder is obtained; the mixed powder is heated to 900-920 DEG C and subjected to heat preservation for 60-300 min, the mixed powder is naturally cooled to the room temperature, a Si8Al6Fe4Ca phase is formed, the high-selectivity organic silicon monomer synthesis additive is obtained, and the content of the Si8Al6Fe4Ca phase in the additive is larger than 70%. The additive for synthesizing the high-selectivity organic silicon monomer is added into industrial silicon powder and is uniformly mixed for synthesizing the organic silicon monomer, so that the selectivity of the synthesis process of the organic silicon monomer can be remarkably improved, and the yield of dimethyl dichlorosilane synthesized by industrial silicon is improved.
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