Simultaneously the by product of 3, 4-xylenol with a purity of over 95% is obtained through filtration and crystallization.

• 试验表明,通过一次精馏生产质量分数>95%25的产品,在精馏分离3,5-二甲酚的同时,经结晶、抽滤还可得到质量分数>95%25的3,4-二甲酚产品。