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

Study on the synthesis of dimethyl 1,4-cyclohexanedicarboxylate by catalytic hydrogenation of dimethyl terephthalate

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/Mg O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/Mg O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.

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：4.5MPa） ,the conversion of DMT was 100% and the selectivity of DMCD was 99% . Such a catalyst shows a good potential in industrial applications.