A process is described for preparing diacetals of glyoxal by reacting from 40 to 75% by weight aqueous glyoxal with monohydric alcohols in the presence of an acid catalyst, which comprises leaving a liquid mixture which, at the beginning of the reaction, comprises alcohol and glyoxal in a molar ratio of at least 15:1 and also water in a concentration of not more than 8% by weight in contact with the acid catalyst until concentration in the reaction mixture of the diacetal formed reaches at least 70% of the equilibrium concentration without more than 5% by weight of the alcohol used having already been distilled off.
描述了一种制备
乙二醛二
缩醛的过程,通过在酸催化剂存在下,将含有40至75%重量的
水合
乙二醛与一元醇反应,该过程包括将液体混合物在反应开始时,醇和
乙二醛的摩尔比至少为15:1,同时
水的浓度不超过8%重量,与酸催化剂接触,直到形成的二
缩醛在反应混合物中的浓度达到至少达到平衡浓度的70%,而已蒸馏的醇不超过已使用醇的5%重量。