Hydroxy m phthalic acid was synthesized from m xylene through oxidization,sulfonation,basic melt,acidification. The total yield of 5 hydroxy m phthalic acid reached 72%(from m phthalic acid).

• 以间二甲苯为原料，经氧化、磺化、碱熔、酸化合成5-羟基间苯二甲酸，其总产率为72%25（以间苯二甲酸计）。