A method to produce diarylmethane or its derivatives by condensation reaction can be carried out without difficulty and without the deterioration of catalyst, and the intended product can be produced inexpensively by recovering and recycling used alcohol. In the method, dimethoxymethane and an aromatic compound are reacted at a temperature of 80 to 400°C with an acid catalyst. Further, the method comprises the steps of (1) reacting alcohol with formaldehyde using an acid catalyst to obtain acetal; (2) reacting the acetal and an aromatic compound using an acid catalyst to obtain a reaction mixture containing diarylmethane or its derivatives and alcohol; (3) separating and recovering diarylmethane or its derivatives and alcohol from the reaction mixture, and (4) recycling at least a portion of the recovered alcohol to the step (1).
一种通过缩合反应生产二芳基
甲烷或其衍
生物的方法,不仅操作简便,而且不会使催化剂变质,还可以通过回收和循环使用废
酒精,以低廉的成本生产出预期产品。在该方法中,二甲氧基
甲烷和芳香族化合物在 80 至 400°C 的温度下与酸催化剂发生反应。此外,该方法还包括以下步骤:(1) 使用酸催化剂使
乙醇与
甲醛反应,得到
缩醛;(2) 使用酸催化剂使
缩醛和芳香族化合物反应,得到含有二芳基
甲烷或其衍
生物和
乙醇的反应混合物;(3) 从反应混合物中分离并回收二芳基
甲烷或其衍
生物和
乙醇;(4) 至少将回收的部分
乙醇循环用于步骤(1)。