TiSiW_(12)O_(40)/TiO_2催化合成对羟基苯甲酸乙酯

CATALYTIC ESTERIFICATION FOR PREPARING ETHYL P-HYDROXYBENZOATE WITH TiSiW_(12)O_(40)/TIO_2

首次以TiSiW12O40/TiO2为催化剂合成了对羟基本甲酸乙酯。结果表明：TiSiW12O40/TiO2具有良好的催化活性，醇酸摩尔比为4：1，催化剂的用量为反应液总量的2．0％，酯化反应时间为2．0h，反应温度为84～86℃，对羟基苯甲酸乙酯的产率可达87．5％。

The catalylic esterification for preparing ethyl p-hydroxybenzoate with TiSiW12O40/TiO2 was described. Thf' syntliesis of p -hydroxybenzoic acid and ethly alcohol,and the factors influencing on the yield of the reaction were discussed. It showed that the solid superacid TiSiW12O40/TiO2 was an excellent catalyst,the yield of the ethyl p-hydroxybenzoato could reach over 87. 5 % under ratio of ethyl alcohol and p-hydroxybenzoic acid 4: 1, the reac tion temperature of 84~86C,reaction time of 2. 0 hour and amount of TiSiW12O40/TiO2 acid superacid catalyst of 2. 0% ,which passed over catalyst Ferric chloride,sulfuric acid and phosphotungstic acid