【作者】 唐盛伟； 刘长军； 梁斌；

【Author】 Tang Shengwei, Liang Bin, Wu Pan, Zhang Quanzhong, Liu Chang Jun (Laboratory of Multi-phase Mass Transfer and Chemical Reaction Engineering,Department of Chemical Engineering, Sichuan University, Chengdu, 610065,China)

【机构】 四川省多相流传质与反应工程重点实验室(四川大学化工学院)；

【摘要】 在一直径为5 0mm的鼓泡床反应器中对以醋酸亚钴水溶液为催化剂的甲苯液相空气氧化反应动力学进行了研究。甲苯液相氧化反应的宏观动力学方程可用下式描述:dCtoldt =-k0 e- 40 84 9RT CtolPaxy其中指前因子k0 k0为15.89s- 1·MPa- 1。在14 5～175℃之间,表观活化能约为4 1kJ/mol。利用双膜理论求得16 5℃时的本征反应动力学为:- dCAdt =7 72 6 9×10 - 6 CACtol。甲苯液相空气氧化反应为慢反应(Ha =0.0 4 0 8) ,受动力学控制。可采用富氧空气对反应进行强化。在尾氧浓度低于7%的限制条件下,富氧空气的最大氧浓度可达5 5 % ,转化率可达2 6 %。更多还原

【Abstract】 Liquid-Phase Oxidation of toluene by air is an environment benign technology for producing benzoic acid In a ф50mm bubble column reactor, kinetics of the oxidation reaction was investigated under conditions close to commercial operation The macrokinetics could be described as: d C tol d t =- k 0e -40949 RT C tol P oxy Where, pre-exponential factor k 0 is 15 89 s -1 ·MPa -1 The apparent activation energy was estimated to be 41kJ/mol in a temperature range from 145℃ to 175℃ The intrinsic kinetics reaction rate constant was calculated by the Film Theory At 165℃, the intrinsic kinetics could be described as:-d C Ad t =7 7269×10 -6 C A C tol Toluene oxidation process was controlled by the chemical reaction The reaction would be enhanced by oxygen enriched air Under the limiting condition of oxygen mole ratio in vent gas must be lower than 7%, the maximum oxygen mole ratio in the air was 55%, and the maximum conversion was 26%更多还原