邻二甲苯空气液相氧化制取邻甲基苯甲酸

Liquid Phase Oxidation of o Xylene by Air to o Methyl Benzoic Acid

探索了用环烷酸钴为催化剂，用空气直接氧化邻二甲苯制取邻甲基苯甲酸的过程及基本反应原理。试验为ｋｇ级工业模拟中试试验，反应为间歇式反应，原料邻二甲苯一次投料量为４．２ｋｇ，目的产物为邻甲基苯甲酸，单程收率可达４７％，总收率可达６２．３６％。采用正交设计法试验，筛选出了工艺过程的最佳操作条件：温度１３０℃，压力０．３ＭＰａ，空气流量０．８ｍ３／ｈ，反应时间６ｈ。

The process of liquid phase oxidation of o xylene by air to produce o methyl benzoic acid using cobalt naphthenate as catalyst has been investigated on a kilogram level industrial simulative medium scale unit.The reaction was intermittent.The yield per pass of o methyl benzoic acid is up to 47% with a total yield of up to 62 36%.The optimum operation conditions were found to be temperature 130℃,pressure 0 3MPa,air flow rate 0 8m 3/h,and reaction time 6h.