四氢苯酐催化加氢合成六氢苯酐及动力学
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摘要
六氢苯酐,英文简写HHPA,一般由四氢苯酐(THPA)催化加氢制备。六氢苯酐是制备聚酯类高档涂料不可缺少的原材料,用六氢苯酐代替芳香族多元酸生产的氨基醇酸漆、聚酯漆、聚氨酯漆、粉末涂料等,能够显著提高涂料的鲜映度、光泽。它也是生产增塑剂、杀虫剂等的原料。而负载型非金属催化剂因为其具有造价低廉、制备简单、催化性能高等优点在催化领域具有很广的应用前景。本论文以Ni/Al2O3, Ni/SiO2, Ni-Cu/SiO2三种催化剂加氢四氢苯酐制六氢苯酐,在此基础上建立了四氢苯酐加氢制六氢苯酐的动力学方程,并对动力学方程进行了验证。
     实验采用等体积浸渍法制备了Ni/Al2O3, Ni/SiO2, Ni-Cu/SiO2三种催化剂,并研究了不同催化剂对四氢苯酐加氢的催化性能。对催化性能的考察主要通过它们对四氢苯酐转化率的影响来实现。通过综合考虑,得出了最佳催化剂Ni/Si02。以Ni/SiO2为催化剂对四氢苯酐加氢动力学进行了研究。同时考察了实验中对催化剂加氢性能有影响的几种因素:温度、压力和液体空时。
     以Ni/SiO2为催化剂,研究了四氢苯酐加氢动力学,测定了反应过程中四氢苯酐浓度随时间变化的c-t曲线,获得了四氢苯酐加氢制六氢苯酐反应的级数和速率常数等动力学参数。结果表明,四氢苯酐转化的反应级数对四氢苯酐为1,对氢为0.5。在此基础上建立了四氢苯酐加氢制六氢苯酐的动力学方程,并对动力学方程进行了验证。
Hexahydrophthalic anhydride is indispensable raw materials of making polyester high-grade coating, with multi-hexahydrophthalic anhydride instead of aromatic amino acid production alkyd, polyester paints, polyurethane paint, powder coating, can significantly improve the mapping degree of fresh paint, gloss. It is also the materials on production of plasticizers, pesticides and other raw materials. The supported metal catalysts that because of theirs low cost, simple preparation, catalytic properties of many advantages in catalysis have a very broad application prospects. This thesis used Ni/Al2O3, Ni/SiO2, Ni-Cu/SiO2 as catalysts to hydrogenate tetrahydrophthalic anhydride to hexahydrophthalic anhydride.
     On this basis, the established the kinetics equation of hydrogenation of tetrahydrophthalic anhydride on hexahydrophthalic anhydride hydrogenation, the kinetic equation is validated. Using equal volume impregnation to make Ni/Al2O3, Ni/SiO2, Ni-Cu/SiO2 three kinds of catalysts, and inspect the catalysts on the catalytic properties of tetrahydrophthalic anhydride hydrogenation. Investigation on the catalytic performance, mainly through their conversion rate of tetrahydrophthalic anhydride hydrogenation. With comprehensive consideration, the optimum catalyst is Ni/SiO2. So choice Ni/SiO2 as catalysts for hydrogenation kinetics of tetrahydrophthalic anhydride. Experiment also investigated the performance of the hydrogenation catalyst of several factors affecting the results. Showing that the three experimental factors affecting is the temperature, pressure and liquid space-time.
     Ni/SiO2 catalyst is used to the hydrogenation kinetics of tetrahydrophthalic anhydride, obtaining the tetrahydrophthalic anhydride concentration versus on time curve on the reaction process, and determined the hexahydrophthalic anhydride hydrogenation reaction order and rate constant and other parameters. The results are given, tetrahydrophthalic anhydride conversion reaction order is 1, the hydrogen is 0.5. On this basis, established the hydrogenation kinetic equation of tetrahydrophthalic anhydride on hexahydrophthalic anhydride, and the kinetic equation is validated.
引文
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