公开(公告)号：US08513472B2

公开(公告)日：2013-08-20

申请号：US13124973

申请日：2009-10-19

申请人： Hirofumi Li ,  Tomoyuki Itou ,  Yoshiki Kawamura ,  Toshiyuki Matsushita

发明人： Hirofumi Li ,  Tomoyuki Itou ,  Yoshiki Kawamura ,  Toshiyuki Matsushita

IPC分类号： C07C27/04

CPC分类号： C07C29/149 ,  C07C29/80 ,  C07C31/20

摘要： There is provided a process for preparing 1,6-hexanediol by esterifying a carboxylic acid mixture resulted from oxidation of cyclohexane with oxygen, and then hydrogenating the esters, which substantially does not contain a compound leading to a high ester value.A process for preparing 1,6-hexanediol from a carboxylic acid mixture containing adipic acid and 6-hydroxycaproic acid, the carboxylic acid mixture is obtained as a by-product in oxidization of cyclohexane to cyclohexanone/cyclohexanol using oxygen or an oxygen-containing gas, the process comprises esterifying the acids with an alcohol, followed by hydrogenation, and the process is characterized by comprising the following steps of: a) separating a component having a boiling point lower than that of water and the alcohol used in the esterification from a mixture obtained by the hydrogenation in a first distillation step; b) separating an EV component having a boiling point higher than that of 1,6-hexanediol further in a second distillation step; c) separating an EV component having a boiling point lower than that of 1,6-hexanediol further in a third distillation step; and then d) obtaining 1,6-hexanediol in a fourth distillation step, in this order.

摘要翻译： 提供了通过用氧气将环己烷氧化产生的羧酸混合物酯化制备1,6-己二醇然后氢化基本上不含导致高酯值的化合物的酯的方法。 从含有己二酸和6-羟基己酸的羧酸混合物制备1,6-己二醇的方法，羧酸混合物是使用氧或含氧气体将环己烷氧化成环己酮/环己醇的副产物 ，该方法包括用醇将酸酯化，然后氢化，该方法的特征在于包括以下步骤：a）将沸点低于水的组分和用于酯化的醇从 在第一蒸馏步骤中通过氢化获得的混合物; b）在第二蒸馏步骤中进一步分离沸点高于1,6-己二醇的EV组分; c）在第三蒸馏步骤中进一步分离沸点低于1,6-己二醇的EV组分; 然后d）在第四蒸馏步骤中依次得到1,6-己二醇。