PROCESS FOR PREPARATION OF METHACLYLIC ACIDESTER

摘要

The method producing methyl metacrylate or ethyl metacrylate continuosly and recovering non-reaction metacrylic acid and alcohols. Metacrylic acid is synthesized by gas-phase catalytic oxidizing at least one compound of isobutylene, t-butanol and metacrolein. In manufacturing metacrylic acid ester with metacrylic acid, alcohol and solid-acid catalyst, the reaction temp is 60-130 deg.C, and pressure is 0-30 psig. A fluidized bed catalyst reactor is used for continuous production. Mixing solvents selected from aromatics such as ethylbenzene, xylene and cumene and from aliphatic such as nonane, decane, decaline and tetraline are used as esterification solvent. The above solid-acid catalyst are porous polystyrene base cation exchange resin and fluorine base cation exchange resin.