Production of cyclic acetals or ketals using solid acid catalysts
    33.
    发明授权
    Production of cyclic acetals or ketals using solid acid catalysts 有权
    使用固体酸催化剂制备环状缩醛或缩酮

    公开(公告)号:US09440944B2

    公开(公告)日:2016-09-13

    申请号:US14337544

    申请日:2014-07-22

    Abstract: A process for making a cyclic compounds such as cyclic acetal or cyclic ketones by feeding aldehyde or ketone compounds and polyhydroxyl compounds to a reaction zone at a molar ratio of polyhydroxyl compounds to aldehyde or ketone compounds of at least 3:1, reacting these compounds in the presence of a solid acid such as an acidic ion exchange resin, to generate a liquid reaction mixture without separating water from the reaction mixture as it is being formed in the reaction mixture, withdrawing the liquid reaction mixture from the reaction zone as a liquid product stream, and feeding the liquid reaction product stream to a distillation column to separate cyclic acetal compounds from unreacted polyhydroxyl compounds, and optionally recycling back the unreacted polyhydroxyl compounds to the reaction zone. The process produces cyclic acetal compounds in yields of at least 90% with long catalyst life. The process is also suitable to make cyclic ketals from ketone compounds.

    Abstract translation: 通过将醛或酮化合物和多羟基化合物以多羟基化合物与醛或酮化合物的摩尔比至少为3:1的比例将醛或酮化合物和多羟基化合物进料到反应区中来制备环状化合物如环缩醛或环酮的方法,使这些化合物在 固体酸如酸性离子交换树脂的存在,以便在反应混合物中形成液体反应混合物而不从反应混合物中分离出水,以液体产物的形式从反应区抽出液体反应混合物 流,并将液体反应产物流进料到蒸馏塔中以从未反应的多羟基化合物中分离出环状缩醛化合物,并任选地将未反应的多羟基化合物回收到反应区。 该方法产生环状缩醛化合物,产率至少为90%,催化剂寿命长。 该方法也适用于由酮化合物制备环状缩酮。

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