对苯二甲酸二甲酯催化加氢制1,4-环己烷二甲酸二甲酯的研究

摘要

In the field of polymer industry,1,4-cyclohexanedimethanol (CHDM) occupies an important position especially for the synthesis of highly valued polyester products .In industry,CHDM is prepared from dimethyl terephthalate (DMT) through a two-step hydrogenation process Palladium supported on magnesium oxide ( Pd/MgO) was prepared by animpregnation method and was characterized by x-ray diffraction (XRD),transmission electron microscope (TEM) and scan electron microscope (SEM).During the hydrogenation of DMT to synthesize dimethyl 1,4-cyclohexanedicarboxylate (DMCD),the as-prepared Pd/MgO was used as the catalyst with methyl acetate as the solvent .Under optimized reaction conditions ( reaction temperature:180 ℃,reaction pres-sure:4.5 MPa) ,the conversion of DMT was 100%and the selectivity of DMCD was 99%.Such a catalyst shows a good potential in industrial applications .%1,4-环己烷二甲醇在高分子工业具有重要的作用,主要用于合成高附加值聚酯产品.在工业上,1,4-环己烷二甲醇主要是由对苯二甲酸二甲酯经两步加氢反应而制得.采用浸渍法制备了Pd/MgO催化剂,并运用X射线衍射(XRD)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)对其进行了结构表征.以乙酸甲酯作溶剂,将制得的Pd/MgO用于对苯二甲酸二甲酯催化加氢制1,4-环己烷二甲酸二甲酯的反应.在180℃,4.5 MPa条件下,对苯二甲酸二甲酯转化率为100%,1,4-环己烷二甲酸二甲酯选择性为99%.研究结果表明该催化剂具有良好的应用潜力.