| Summary: | 碩士 === 東海大學 === 化學工程學系 === 89 === This thesis studies catalysts for the epoxidation of allyl alcohol with hydrogen peroxide to glycidol. A variety of reaction conditions are investigated, including reaction temperature, additive types and concentration、catalyst amounts and reactant concentration, to study their influence on the conversion, yield and selectivity. In addition, reaction kinetics of allyl alcohol epoxidation is studied.
Na2WO4·2H2O shows good catalylic performance for epoxidation of allyl alcohol to glycidol. With the increase of reaction temperature, the reaction rate increase, but selectivity and yield of glycidol decrease at high temperature due to the increase of by-product formation. We found that the optimum reaction temperature is in the range of 40℃ and 50℃. The optimum mole ratio of H2O2 to Na2WO4·2H2O is 1/4.8*10-3.
For catalyst H2WO4, the addition of suitable additives significantly increase the selectivity and yield of glycidol, especially NaOH and KOH have the best results, The optimum mole ratio of additive to H2WO4 is 2.
The results of kinetics study show that the epoxidation of allyl alcohol to glycidol with Na2WO4·2H2O is first order reaction and the activation energy is 55.33KJ/mole.
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