Synthesis technology of fructone

Using acid-treated attapulgite clay as supporter,attapulgite clay supported phosphotungstic acid catalyst were prepared through impregnation method,and characterized by XRD,IR and UV spectrophotometry.Such catalyst was used for synthesis of fructone.Effects of molar ratio of ethyl acetoacetate to glycol,the dosage of catalyst,the dosage of water stripping agent,the reaction time,the reaction temperature on the esterification yield were investigated.The experimental results showed that attapulgite clay supported phosphotungstic acid catalyst has good catalytic activity,structural stability,and can be reused.Optimum conditions for the synthesis are:molar ratio of ethyl acetoacetate to glycol is 1.0∶1.5;the dosage of catalyst is 2 g;the amount of benzene as water stripping agent is 50 mL;the reaction time is 3 h;the reaction temperature is 110 ℃.Its yield achieves higher than 89.7%.