Zhang Jiang-bei
2000
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Journal
Journal of Hebei University of Science and Technology
Abstract
The synthetic method with direct esterification for ethyl p-hydroxy-benzoate (nipagin B ) is described,p-methyl-benzenesulfonic acid is prepared by authors as catalyst, benene as the water-carrying agent, and aluminum oxide as the dryagent. The effects of reaction time,material ratio,amount of catalyst on yield are discused. Optimum process conditions are that p-hydroxybenzoc acid: ethanod: benzene: p methyl benzenesultfonic acid = 1: 4: 1: 1: 0.1, reaction time is 8h, temperature is 78~110℃,and the reaction yield can reach to 86. 9 %.