Preparation process of trimethyl idodine silicon hydride

Abstract

The invention discloses a preparation process of trimethyl idodine silicon hydride, which comprises the following specific steps of: (1) hexamethyldisiloxane preparation: firstly adding m-xylene and metallic potassium into a stirring kettle, mixing and agitating; and then dropwise adding trimethylchlorosilane into the stirring kettle, stop agitating after reaction and leading materials in the kettle into a washing kettle; (2) washing: adding water into the washing kettle, standing and settling, rectifying generated liquid and recovering solid residues; (3) rectification: adding clear liquid into a rectifying tower kettle, intermittently recovering hexamethyldisilane and intermediate fractions and then recovering the m-xylene; and (4) iodine silane synthesis: adding the rectified hexamethyldisiloxane into a reaction kettle, and adding iodine to generate a trimethyl idodine silicon hydride product. The preparation process has the beneficial effects that the reaction is finished in a micro-positive pressure system, so that the mass transfer and heat transfer effects in the reaction are better, the generated residues in the reaction are less, the product conversion rate is greatly improved, the control is easy, and the operating cost is reduced.

Description

technical field [0001] The invention relates to a preparation process of iodotrimethylsilane. Background technique [0002] The traditional preparation process of iodotrimethylsilane is to firstly react aluminum powder, hexamethyldisiloxane and iodine in a reaction kettle, obtain crude trimethyliodosilane after distillation, and then distill trimethyliodosilane Put the crude product in a still, add copper powder and raise the temperature, collect the distillate to obtain refined iodotrimethylsilane, or directly react trimethylchlorosilane and metal potassium in the reaction kettle under high pressure conditions. [0003] The biggest problem of the traditional preparation process is that there are side reactions in the reaction process, which produce some former fractions and residues. At the same time, under high pressure conditions, the operation is difficult to control, the operation safety is low, the product yield is greatly reduced, and the by-products and waste residue...

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Problems solved by technology

[0003] The biggest problem of the traditional preparation process is that there are side reactions in the reaction process, and some previous fractions and residues are produced. At the same time, under high pressure conditions, the operation is difficult to control, the operation safety is low, the product yield is greatly reduced, and the by-products and waste residues increase.

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