Chinese Enterprise Granted Patent for Rectification Purification Method of Heptamethyltrisiloxane - heptamethyltrisiloxane factory&supplier

According to the China National Intellectual Property Administration (CNIPA), a Chinese company has obtained a patent titled A Rectification Purification Method for Heptamethyltrisiloxane. Its grant publication number is CN121735999B, with the filing date in December 2025. Targeting long-standing industry pain points of insufficient product purity, difficult impurity separation, high energy consumption and low yield in conventional processes, this patent greatly improves product quality and production efficiency.

Key Technical Pain Points Addressed

Difficulty in obtaining highpurity products Conventional processes can hardly stably raise the purity of heptamethyltrisiloxane above 99.8%. Adopting a special process of vacuum rectification with sidedraw extraction, the patented technology directly produces ultrapure grade material to meet stringent requirements of highend agricultural adjuvants and electronicgrade silicones.

Difficult separation of light and heavy component impurities Traditional rectification only discharges materials from the top or bottom of the column, which easily entrains impurities with similar boiling points. For this patent, crude products after catalytic equilibrium are first fed into a heavyends removal column. Under negative pressure of -0.08 ~ -0.095 MPa and a high reflux ratio of 8:1 ~ 20:1, the target product is precisely extracted from the side line at the middle section of the column, achieving thorough separation of light and heavy impurities.

High energy consumption and low production yield Repeated heating and cooling in multistage rectification of conventional routes lead to high energy consumption and substantial product loss. The optimized singlecolumn sidedraw process eliminates redundant rectification cycles, cutting energy consumption while markedly boosting the yield of target product.

Poor batchtobatch consistency Traditional processes suffer from drastic fluctuations in impurity levels across batches. By precisely controlling negative pressure and reflux ratio, the patented method enables stable and controllable production, delivering highly consistent purity and impurity specifications batch after batch.