Gas-liquid-liquid mass transfer of 2,3,6-trimethylphenol oxidation

doi:10.11949/j.issn.0438-1157.20150839

Abstract

Abstract:

The purpose of this paper is to investigate the gas-liquid-liquid mass transfer of 2,3,6-trimethylphenol (TMP) oxidation under oxygen. The reaction can be regarded as rapid and takes place in liquid-film. The oxidation rate is in first order with respect to TMP concentration. Under the condition of liquid film controlling, the effects of water phase volume fraction (ε), stirring speed (n), impeller diameter(d) and gas ventilation (V) on k_L(O₂)a were investigated. The results showed that a phase inversion took place when ε surpassed 0.58, and the trend of k_L(O₂)a changed significantly, k_L(O₂)a increased with increasing n, d and V. Considering the effects of all the four factors on k_L(O₂)a, a dimensionless correlation equation of k_L(O₂)a can be obtained. The calculated values are in good agreement with the experimental values with the relative deviation between 1.18% and 10.15%, and the average relative deviation of 4.53%, which shows that the equation fitting is reasonable.

Key words: 2,3,6-trimethylphenol, oxidation, multiphase reaction, mass transfer, liquid phase volumetric mass transfer coefficient

摘要：

对2,3,6-三甲基苯酚(TMP)的气-液-液纯氧常压三相氧化反应与传质过程进行了研究。该反应为液膜传质控制的快速反应,氧气消耗速率对原料TMP为1级。在液膜控制条件下探讨了水相体积分数(ε)、搅拌转速(n)、搅拌桨直径(d)和通气量(V)对反应的影响。结果表明,体系在e达到0.58后产生相变,相变后液相体积传质系数随ε变化趋势发生改变,液相体积传质系数(k_L(O₂)a)随n、d、V的增加而增大。综合考虑上述因素对k_L(O₂)a的影响,得到了液相体积传质系数的量纲一关联式,根据关联式计算得到的液相体积传质系数值与实验值接近,平均相对偏差为4.53%,表明关联式拟合效果较好。

关键词: 2,3,6-三甲基苯酚, 氧化, 多相反应, 传质, 液相体积传质系数

CLC Number:

TQ013.2

CHEN Zhirong, YANG Weitao, ZHOU Kai, HUANG Haiping, YIN Hong, YUAN Shenfeng. Gas-liquid-liquid mass transfer of 2,3,6-trimethylphenol oxidation[J]. CIESC Journal, 2015, 66(8): 2962-2967.

陈志荣, 杨伟涛, 周凯, 黄海平, 尹红, 袁慎峰. 2,3,6-三甲基苯酚气-液-液氧化反应与传质过程[J]. 化工学报, 2015, 66(8): 2962-2967.

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