This study reveals high esterification rates of pentaerythritol and octanoic acid, indicating efficient vacuum autocatalytic processes.
The vacuum autocatalytic esterification process and reaction kinetics of pentaerythritol and octanoic acid at the reaction temperature of 220℃ to 250℃ were studied by online sampling method. The kinetic parameters of the stepwise esterification reaction were calculated, and the reaction kinetic model was established. The results show that the synthesis of pentaerythritol octanoate by vacuum autocatalytic esterification method requires no catalyst, the reaction time is 4-5 h, the esterification rate is more than 98%, and the content of tetraester is over 96%. The reaction is endothermic and the activation energy of each step is 23.21~32.26 kJ⋅mol −1 . The calculated kinetic model is in good agreement with the experimental values.
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Liu et al. (2025) studied this question.
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