超临界CO_2中苯酚(钠)合成水杨酸反应动力学  

Kinetics on Synthesis of Salicylic Acid from Phenol or Sodium Phenolate in Supercritical Carbon Dioxide

作　　者：徐明仙[1] 丁春晓[2] 胡斯翰[3] 林春绵[2] 

机构地区：[1]杭州职业技术学院临江学院,浙江杭州310018 [2]浙江工业大学生物与环境工程学院,浙江杭州310014 [3]浙江省环境监测中心,浙江杭州310015

出　　处：《化学反应工程与工艺》2011年第5期472-476,共5页Chemical Reaction Engineering and Technology

基　　金：浙江省自然科学基金(Y5110158);浙江省教育厅项目(Y200805324)

摘　　要：在高压反应釜中,分别以苯酚钠和苯酚为原料,以无水K2CO3为催化剂,实验考察了超临界CO2中酚钠合成水杨酸及苯酚直接合成水杨酸的反应过程。根据实验结果,提出可能的反应机理为苯酚(钠)可逆生成水杨酸,然后在高温下进一步形成聚合物,建立了可逆反应的动力学模型。由实验得到的不同温度下苯酚(钠)转化率数据,计算得到了超临界CO2条件下正、逆反应速率常数。超临界CO2中酚钠合成水杨酸和苯酚直接合成水杨酸的活化能分别为42.26 kJ/mol和46.40 kJ/mol。In supercritical CO2,syntheses of salicylic acid from sodium phenolate or directly from phenol were investigated using anhydrous K2CO3 as catalyst in a high pressure tank with stirred.According to experimental results,the reaction mechanism was supposed and the reversible reaction kinetic model was established.By the conversions under different temperatures,the reaction rate constants of positive and reverse reactions were calculated.The activation energies of salicylic acid synthesis from sodium phenolate and directly from phenol in supercritical CO2 were 42.26 kJ/ mol and 46.40 kJ/ mol respectively.

关 键 词：超临界二氧化碳 苯酚 苯酚钠 水杨酸 反应动力学 

分 类 号：O643.11[理学—物理化学]