CATALYTIC SYNTHESIS OF BUTYRALDEHYDE 1,2-PROPANEDIOL ACETAL WITH PHOSPHOTUNGSTIC ACID/SILICA

Butyraldehyde 1,2-propanediol acetal was synthesized from butyraldehyde and 1,2-propanediol in the presence of phosphotungstic acid/silica prepared by sol-gel method.The effects of operation parameters such as molar ratio of butyraldehyde to 1,2-propanediol,the dosage of catalyst,the volume of cyclohexane as the water-carrying agent and reaction time on the yield were measured and analyzed in order to optimize these operation conditions.Under the experimental conditions of molar ratio of butyraldehyde to 1,2-propanediol is 1:1.6,the mass ratio of the catalyst is 0.50% of all the reactants,volume of cyclohexane is 6ml,and the reaction time is 60min,the yield of butyraldehyde 1,2-propanediol acetal is 78.5%.