Solid acid catalyst is a white powder-like solid, includes irregular shape and spherical shape, without any special storage conditions, under normal conditions, but stable and nonflammable. In the lab, solid acid catalysts can replace the liquid acid catalysts and application mixing directly added to the reaction solution. Just by simple filtration can be catalysts to recover, technology also reduces the alkali neutralizing and washing processes. The broken populist effect filters to prevent the catalyst particle, and we do not advocate the use of magnetic mixing, use mechanical mixing. In factory production, catalysts used in mixing-type reaction kettle is used in fixed-bed use. Used in fixed-bed main advantages of this type of catalyst in a swelling deformation, stable physical and chemical properties an outstanding property.