Monomer Synthesis and Precision Distillation The Quality Foundation for High End Silicone Oil
Jun 1, 2026
In the silicone oil industry chain, the comprehensive performance, stability, and service life of silicone oil essentially depend on the purity and quality of the front-end raw material monomers. Compared to backend aggregation, modification, and molding processes, the synthesis and purification technology of methyl chlorosilane monomer is the core barrier that separates ordinary civilian silicone oil from high-end industrial grade silicone oil, and is also the underlying core source that determines product temperature resistance, stability, and cleanliness.
The current global industrial production system for silicone oil products is based on methylchlorosilane monomer as the core raw material. All linear, modified, and functional silicone oil polymerization reactions rely on high-purity monomers to achieve standardized and stable production. The large-scale production in the industry generally adopts the mature Rochow direct synthesis process, using metallurgical grade silicon powder and chloromethane as basic raw materials, combined with high-performance copper based composite catalytic system, to complete the catalytic synthesis reaction in a fluidized bed high-temperature gas-phase environment at 280 ℃ -320 ℃, efficiently generating methyl chlorosilane mixed crude monomers. This process technology is mature, has high capacity utilization, and is suitable for large-scale industrial production. It is currently recognized as the mainstream production route in the global organic silicon industry.
The core technological breakthrough in monomer synthesis focuses on precise control of reaction selectivity. During high-temperature catalytic reactions, the system is prone to the generation of various high and low boiling by-products, which directly affect the effective monomer yield and raw material utilization. Through core process methods such as intelligent temperature control, stable voltage regulation, and fine optimization of catalyst ratios, the reaction equilibrium range can be accurately locked, and the output ratio of the core effective component dimethyldichlorosilane (DMDCS) can be stably controlled at 80% -85%, effectively suppressing the occurrence of side reactions, maximizing the utilization of core raw materials, and reducing production losses and costs.
The crude monomer contains a large amount of impurities, high and low boiling substances, and by-product components, and its purity cannot meet the production standards of high-end silicone oil and precision industrial silicone oil. It must undergo multi-stage gradient precision distillation purification treatment. Through a complete set of purification processes such as graded distillation, precise separation, and impurity removal, the ineffective impurities, residual by-products, and isomers in the crude monomer can be completely removed, ultimately obtaining high-purity dimethyl dichlorosilane refined monomer.
High purity monomers are the core guarantee for the quality of high-end silicone oil, which can make the subsequent polymerization reaction stable and controllable throughout the process, effectively solving common problems in the industry such as fluctuations in the molecular weight of finished products, residual small molecules, and excessive impurities. Optimize the temperature stability, chemical stability, cleanliness, and uniformity of silicone oil products from the source, so that the finished silicone oil can maintain its performance without degradation under complex working conditions such as high and low temperature alternation, corrosive media, and long-term service.
With the intelligent and refined upgrading of domestic organic silicon equipment, leading enterprises have fully realized the localization of fluidized bed production equipment, intelligent and precise control of production parameters, and the stability of monomer synthesis, distillation and purification accuracy, and batch consistency have all reached international advanced levels, laying a solid foundation for domestic high-end silicone oil to replace imports and empower the development of high-end manufacturing in all fields.
