姚家锐,吴雨轩,常诚,张才亮,顾雪萍,冯连芳

• 1:浙江大学工程师学院
• 2:化学工程与低碳技术全国重点实验室
• 3:浙江大学化学工程与生物工程学院
• 4:浙江大学衢州研究院

摘要(Abstract)：

4-羟基-2-苯甲酸(HBA)和6-羟基-2-萘甲酸(HNA)与乙酸酐的乙酰化反应是制备高性能液晶聚芳酯单体的关键步骤。建立基于原位拉曼光谱的酚羟基转化率实时监测方法,分别研究了HBA和HNA在不同温度、投料比下的乙酰化反应动力学。建立反应动力学模型并通过实验数据整定参数,模型预测的转化率与实验值相比,均方根误差分别为5.57×10~(-3)、2.71×10~(-3)。研究表明:HBA和HNA乙酰化反应为平衡反应,正反应活化能分别为53.5 kJ·mol~(-1)和45.1 kJ·mol~(-1),指前因子分别为2.9×10~3 L·mol~(-1)·min~(-1)和9.2×10~2 L·mol~(-1)·min~(-1),平衡常数随反应温度的依数关系分别为14.5exp(396.29/T)和18.4exp(565.31/T)。随着温度升高或投料比增大,HBA和HNA的乙酰化反应中酚羟基转化率提高。HBA体系中,降低温度或增大投料比,有利于产物乙酰氧基与羧基比值接近1。HNA体系在不同实验条件下,乙酰氧基与羧基比值始终维持在0.9附近。

关键词(KeyWords)： 液晶聚芳酯;乙酰化;原位拉曼光谱;动力学模型;转化率

Abstract:

Keywords:

基金项目(Foundation): 浙江省自然科学基金（LZY22E030004）

作者(Author): 姚家锐,吴雨轩,常诚,张才亮,顾雪萍,冯连芳

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