Hexamethyldisiloxane preparation method capable of purifying raw materials

By optimizing the hydrolysis reaction process of hexamethyldisiloxane, using deionized water and dilute hydrochloric acid as catalysts, and combining centrifugal separation and countercurrent water washing, the problem of complex catalyst recovery steps in the existing technology is solved, efficient purification and comprehensive utilization of by-products are achieved, and preparation costs are reduced.

CN120757577APending Publication Date: 2025-10-10SANMING ZHUOYUE FLUOROSILICONE CO LTD
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Patent Information

Application Number
CN202510630905.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-16
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

Existing methods for preparing hexamethyldisiloxane require additional catalysts and separation and recycling steps, resulting in increased costs and reduced efficiency.

Method used

By optimizing the hydrolysis reaction process, using deionized water to control the temperature, combining dilute hydrochloric acid catalysis and sodium carbonate neutralization, and adopting centrifugal separation, countercurrent water washing and molecular sieve adsorption, redundant steps are reduced, the reaction efficiency is improved and the by-products are recovered as by-products.

Benefits of technology

The method realizes efficient purification of hexamethyldisiloxane, reduces the catalyst recovery step, reduces the preparation cost, and improves the utilization rate of by-products and the purity of the product.

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Abstract

The invention discloses a hexamethyldisiloxane preparation method capable of purifying a raw material, and relates to the technical field of chemical preparation, the hexamethyldisiloxane preparation method capable of purifying the raw material comprises the following steps: S1, raw material preparation: cooling deionized water through a cooling system, and maintaining the temperature to be less than or equal to 10 DEG C, then injecting part of the cooled deionized water into a tubular reactor, pumping trimethylchlorosilane and methylbenzene into a premixing tank according to a proportion, and uniformly stirring and mixing; s2, catalytic promotion: injecting diluted hydrochloric acid into the tubular reactor, uniformly mixing the diluted hydrochloric acid with deionized water, and maintaining the pH value to 2-3; according to the hexamethyldisiloxane preparation method capable of purifying the raw materials, redundant steps such as catalyst recovery and repeated washing can be omitted through the hydrolysis reaction, the method is suitable for continuous production, meanwhile, the process of the hydrolysis reaction is optimized by changing the use steps and the input method of the deionized water, and the stability in the preparation process is further maintained.
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