摘要
对邻苯二甲酸酐水解反应动力学进行了研究.在线测定了溶液中pH值的变化,根据pH值与溶液浓度之间一一对应的关系,得到苯酐在水解过程中邻苯二甲酸浓度的变化.由水解结束时溶液的平衡浓度与此时溶液的pH值,计算了不同温度下邻苯二甲酸的一级电离常数Ka,从而确定了水解反应级数α和不同温度下反应速率常数k.得到以下结论:随着温度的升高,水解速率常数也随之增加.根据阿伦尼乌斯方程,求得了水解反应的活化能Ea为9.45 kJ/mol、指前因子A为2.30.
The hydrolysis kinetics of phthalic anhydride was investigated. The concentration of phthalic acid in aqueous solution was determined based on the relationship between pH value and concentration. The primary ionization constant Ka of phthalic acid at different temperatures was calculated. The hydrolysis reaction order α and rate constant k were evaluated. The results were obtained as follows ： with the rising of temperature, hydrolysis rate constants have been increased, and the hydrolysis reaction activation energy Ea was 9.45 kJ/mol and A was 2. 30 for the Arrhenius equation.
出处
《南京工业大学学报（自然科学版）》
CAS
2007年第1期19-22,共4页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省材料摩擦学重点实验室开放基金资助项目(kjsmcxo4001)
关键词
邻苯二甲酸酐
水解
动力学
phthalic anhydride
hydrolysis
kinetics
作者简介
管冲（1981-），男，江苏苏州人，硕士生，主要研究方向为单体合成、复合材料、结晶等；黄培（联系人），教授，E-mail：phuang@njut．edu．cn．
