In the method of SNIA, toluene is used as raw material, the process mainly consists of oxygenation of toluene, hydrogenation of benzoic acid, nitrosation of cyclohexane-carboxylic acid with nitrosyl sulfuric acid. 甲苯法以甲苯为原料,甲苯先被氧化为苯甲酸,继而加氢得到六氢苯甲酸,再亚硝化制得己内酰胺。