Abstract:

Phosphatotungstic acids (H3PW12O40, PW12) supported on alumina are employed to catalysis the synthesis of ethyl p-hydroxybenzoate. Through the yield of ethyl p-hydroxyben- zoate and the dissolution of HPAs, we research the function and strength of the catalyst. We know that the yield of ethyl p-hydroxybenzoate is up to 83.8%, the rate of dissolution of pho- sohotungstic acid is 2.8%. Even after the catalyst was recycled for six runs with only 12.5%, the rate of dissolution of phosohotungstic acid.Therefore, it is a kind of effective and environ- mental friendly esterification catalyst.

Key words: phosphatotungstic acids, alumina, carriers, catalysis