Synthesis method for preparing polymerization inhibitor 706 by using sulfonated silicon dioxide catalyst

• Main Authors: HU XINLI, LIN JUNYI, XIANG ZHANBO, SHI XIAO, ZHAO XIAOFENG, CHEN JINKUN, BI YAJUN
• Format: Patent
• Language: Chinese; English
• Published: 22.09.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; HETEROCYCLIC COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention provides a synthesis method for preparing a polymerization inhibitor 706 by using a sulfonated silicon dioxide catalyst, which comprises the following steps: dissolving a polyoxypropylene-polyoxyethylene copolymer solution in water, adding concentrated hydrochloric acid, heating to 40 DEG C, adding tetraethyl silicate into the solution, stirring, adding 3-mercaptopropyltrimethoxysilane and 30wt.% hydrogen peroxide, reacting for 2-4 hours, and then cooling to room temperature to obtain the polymerization inhibitor 706. Continuously stirring, after the reaction is finished, carrying out suction filtration on the solution to obtain a filter cake and filtrate, treating the filtrate with activated carbon, mixing with the filter cake, aging, washing, acidifying and drying to obtain a sulfonated silicon dioxide catalyst; the sulfonated silicon dioxide catalyst synthesized by the method is simple in synthesis method and high in catalytic reaction activity, and has high reaction selectivity in 706 polyme