Influence of water on esterification reaction between terephthalic acid and ethylene glycol



Examples of simulation in the first reactor for the direct continuous esterification were shown to predict the effects of water added into the reactor (δmath image) on the reactions by a computer. From the simulation results, the followings were confirmed: Although the higher δmath image gives the worse results, i.e., the main reaction rates become lower, it brings about the better results, i.e., the side reactions of diethylene glycol (DEG) formation is suppressed; the clearing point where solid (undissolved) terephthalic acid begins not to exist in the reaction mixtures, β = 1, is the point of AV = 0.6 eq/kg, which coincides with the point obtained from the experimental observation, independently of reaction conditions.