A method for the synthesis of cyclic acetals comprises reacting at least one carbonyl-function compound selected from aldehydes, ketones, and/or linear acetals, on a polyol in a concentrated aqueous solution exceeding 20 wt % in a reactor containing an acidic catalyst. The carbonyl-function compound is selected so that the cyclic acetal obtained has a water solubility lower than 20000 mg/kg. During the catalytic reaction for the cyclic acetal synthesis, at least one portion of the organic phase containing the cyclic acetal is separated. The acidic catalysis is either homogeneous when using a water-soluble strong acid, or heterogeneous when using a solid acid such as a resin, a zeolite, or any appropriately acidified solid. The extractive reaction method can be used for obtaining high conversions and selectivity.
一种合成环状
缩醛的方法包括在含有酸性催化剂的反应器中,将至少一种来自醛、酮和/或线性
缩醛的羰基官能团化合物与多元醇在超过20重量%的浓缩
水溶液中反应。选择的羰基官能团化合物是为了使得得到的环状
缩醛的
水溶性低于20000毫克/千克。在合成环状
缩醛的催化反应过程中,至少分离出含有环状
缩醛的有机相的一部分。当使用
水溶性强酸时,酸性催化是均相的,当使用
树脂、
沸石或任何适当酸化的固体时,酸性催化是异相的。提取反应方法可用于获得高转化率和选择性。