Research on synthesis of m-aminophenol by hydrolysis of m-phenylenediamine

M-aminophenol(MAP) was prepared from m-phenylenediamine through the catalysis of sulfuric acid at obturational situantion.The effect of reaction temperature,time,moler ratio and the concentration of sulfuric acid was explored through kinetic experiment,and the result showed that the concentration of acid 22%,reaction temperature 200 ℃,the mole ratio of m-phenylenediamine to acid 1∶1.98,reaction time 6 h was the best reation condition.Under these conditions the conversion of m-phenylenediamine acid could reach up to 81.19%,and the yield and selectivity of MAP was 56.34% and 69.38%,respectively,and the yield of by-product resorcinol was 24.13%.