Abstract: From the aspects of selectively hydrogenating C5 fractions,thermodynamic and kinetic properties,the reaction system of etherifing C5 fractions with methonal was analyzed theoretically.The components of di-ofines in the C5 fractions can be effectively removed by selective hydrogenation.The process of etherification involves three simultaneous reversible reactions-the etherification and the isomerization between the isoamylenes.To improve the conversion of isoamylenes,the factors of reaction rates and chemica...