In this work, the vapor liquid equilibrium and vapor liquid liquid equilibrium data of water-acetic acid-p-xylene were conducted in a modified Othmer type equilibrium still at 101.32 kPa.

• 水-醋酸-对二甲苯三成份是否有三成份共沸一直是个争议的问题，本研究利用共沸蒸馏装置去测定，其结果水-醋酸-对二甲苯没有三成份共沸点存在。