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    • 1. 发明授权
    • Method for producing hexanediol-1,6
    • 己二醇-1,6-
    • US06288286B1
    • 2001-09-11
    • US09700366
    • 2000-11-15
    • Frank SteinThomas KrugMartin GallGabriele Iffland
    • Frank SteinThomas KrugMartin GallGabriele Iffland
    • C07C2700
    • C07C29/149C07C2601/14C07C31/20C07C35/08
    • A process for preparing 1,6-hexanediol from a carboxylic acid mixture obtained as by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol with oxygen or oxygen-comprising gases and by aqueous extraction of the reaction mixture and comprising adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols by esterification of the acids and hydrogenation, by a) reacting the mono- and dicarboxylic acids in the aqueous dicarboxylic acid mixture with a low molecular weight alcohol to form the corresponding carboxylic esters, b) conducting a first distillation to remove excess alcohol and low boilers from the esterification mixture obtained, c) conducting a second distillation to separate the bottom product into an ester fraction which is essentially free from 1,4-cyclohexanediols and a fraction which includes at least the larger proportion of the 1,4-cyclohexanediols, d) subjecting the ester fraction essentially free from 1,4-cyclohexanediols to a catalytic hydrogenation, and e) subjecting the hydrogenation effluent to a distillation to recover 1,6-hexanediol in a conventional manner, comprises using an aqueous dicarboxylic acid mixture comprising more than 20 ppm of cobalt and more than 40 ppm of phosphorus in the form of phosphate and passing this aqueous dicarboxylic acid mixture through a cation exchanger and after the esterification of step (a) through an anion exchanger.
    • 从环己烷氧化成环己酮/环己醇与氧气或含氧气体的副产物得到的羧酸混合物中制备1,6-己二醇的方法,并通过水提取反应混合物,并包含己二酸,6- 羟基己酸和少量的1,4-环己烷二醇通过酸的酯化和氢化,a)使二羧酸二羧酸混合物与低分子量醇反应形成相应的羧酸酯,b)导电 从所得到的酯化混合物中除去多余的醇和低沸点物的第一次蒸馏,c)进行第二次蒸馏以将底部产物分离成基本上不含1,4-环己烷二醇的酯馏分和至少包括较大的 1,4-环己烷二醇的比例,d)将基本上不含1,4-环己烷二醇的酯馏分进行催化水解 国家和地区)使氢化流出物以常规方式进行蒸馏以回收1,6-己二醇,包括使用包含大于20ppm钴的多余二羧酸混合物和大于40ppm磷酸盐形式的磷, 使该含水二羧酸混合物通过阳离子交换剂,并且在步骤(a)通过阴离子交换剂酯化之后。