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本发明提供了一种以废旧PET降解单体对苯二甲酸二乙二醇酯为原料制备1,4-环己烷二甲醇的方法。涉及高分子化合物降解产物的高值化利用和加氢还原领域。以废旧PET降解所得单体对苯二甲酸二乙二醇酯为原料,采用两步加氢法制备1,4-环己烷二甲醇。第一步是在Pd/C催化作用下,将苯环加氢得到中间产物1,4-环己烷二甲酸二乙二醇酯,第二步是以第一步加氢产物为原料在铜铬催化剂的催化作用下,将侧链上的酯基还原为醇基,得到1,4-环己烷二甲醇。本发明将废旧PET降解单体转化为高附加值产品1,4-环己烷二甲醇,不仅降低了原料成本,也为废旧PET资源的回收再利用提供了一个新方向,对于资源的可持续发展具有重要意义。
The invention provides a method for preparing 1,4-cyclohexanedimethanol by using waste PET degrading monomer ethylene terephthalate as a raw material. It relates to the field of high value utilization and hydrogenation reduction of polymer compound degradation products. The degradation of waste PET degradation monomer terephthalate as raw material, two-step hydrogenation of 1,4-cyclohexane dimethanol. The first step is under Pd / C catalysis, the hydrogenation of the benzene ring to give an intermediate 1,4-cyclohexanedicarboxylic acid diethylene glycol ester, the second step is to hydrogenate the first step as raw material in the copper Under the catalysis of chromium catalyst, the ester groups on the side chains are reduced to alcohol groups to obtain 1,4-cyclohexanedimethanol. The method of the invention converts waste PET degradation monomer into high value-added product 1,4-cyclohexanedimethanol, which not only reduces the raw material cost but also provides a new direction for the recycling and recycling of the waste PET resources, Development is of great significance.