| abstract |
The invention discloses a composite solid acid, a preparation method and application thereof. The preparation method of the composite solid acid disclosed in the present application is as follows: adding oxide and fluoride into water, filtering to obtain a solid, and heating the obtained solid at 150-350° C. for 12-100 hours to obtain a composite solid acid; The oxide is one or more of magnesium oxide, aluminum oxide, zinc oxide, iron oxide, copper oxide, titanium dioxide, zirconium dioxide, silicon dioxide, diatomaceous earth and montmorillonite; the fluorine The compound is one or more of magnesium fluoride, calcium fluoride, zinc fluoride, copper fluoride and aluminum fluoride. The composite solid acid in the present invention can be applied to the preparation of difluoroacetate compounds, the preparation method has high atom economy, concise preparation steps, suitable preparation process for continuous pipeline reaction, safe technological process, short reaction time, It has high yield, few three wastes, and is an environment-friendly preparation method. |