Catalytic Synthesis of Butyraldehyde Glycol Acetal with H_4SiW_(12)O_(40)/MCM-48

摘要

A novel environmental friendly catalyst，H_4SiW_(12)O_(40)/MCM-48, was prepared by impregnation method. The catalysts were characterized by means of XRD and FT-IR. The synthesis of butyraldehyde glycol acetal catalyzed by H_4SiW_(12)O_(40)/MCM-48 was studied with butyraldehyde and glycol as reactants. H_4SiW_(12)O_(40)/MCM-48 was an excellent catalyst for the synthesizing butyraldehyde glycol acetal and Keggin structure of H_4SiW_(12)O_(40) kept unchanged after being impregnated on surface of the molecular sieve support. Effects of n(butyraldehyde): n(glycol), catalyst dosage, cyclohexane (water-stripped reagent) and reaction time on yields of the product were investigated. The optimum conditions had been found, that is, molar ratio of butyraldehyde to glycol is 1:1.4, mass ratio of catalyst used to the reactants is 0.4% and reaction time is 45 min. Under these conditions, the yield of butyraldehyde glycol acetal can reach 73.3%.