A new production technology of high-quality trimellitic anhydride with the liquid-phase air-oxidation from 1,2,4-trimethylbenzene was developed.

• 偏苯三酸酐的生产方法主要有偏三甲苯气相空气氧化法、偏三甲苯液相硝酸氧化法、偏三甲苯液相空气氧化法和间二甲苯甲醛液相空气氧化法。