一种乙烯聚合用TiCl_4/MgCl_2催化剂的制备

Preparation of a kind of TiCl_4/MgCl_2 catalyst for ethylene polymerization

研究了含Mg载体ClMg(OR)·ROH(R为乙基和正丁基)的制备和反应机理。分别以CH2Cl2,CHCl3,CCl4作为溶剂,在n(C2H5OH)/n(Mg)为2.0的条件下,可以合成ClMg(OC2H5)·C2H5OH载体,并且成本较低。采用ClMg(OR)·ROH为载体与TiCl4反应,制备了乙烯聚合用负载型催化剂,研究了该催化剂的制备规律和催化乙烯聚合的性能。结果表明:以ClMg(OC4H9)·C4H9OH为载体制备TiCl4/MgCl2催化剂,载Ti时间为2 h,载Ti温度为110℃,TiCl4用量为2.0 mL/g,载Ti次数为3次时,制备的负载型催化剂催化乙烯聚合具有较高的活性,可达4.6 kg/(g·h)。

The preparation and reaction mechanism of magnesium-containing supports ClMg（OR）·ROH （R was ethyl or n-butyl） were studied. ClMg（OR）·ROH could be synthesized by a low cost approach in con-ditions that CH2Cl2 or CHCl3 or CCl4 was used as a solvent and the molar ratio of C2H5OH to Mg was 2.0. A kind of supported catalyst for ethylene polymerization was prepared through the reaction of ClMg（OR）·ROH as a carrier with TiCl4. The rules for preparing the catalyst and its catalytic performance in ethylene polymerization were researched. The results show that the obtained supported catalyst has relatively high activity up to 4.6 kg/（g·h） in ethylene polymerization when the TiCl4/MgCl2 catalyst is synthesized with ClMg（C4H9）·C4H9OH as a support, in conditions that titanating time is 2 hours, titanating temperature is 110 ℃, TiCl4 amount is 2.0 mL/g and TiCl4 is treated three times.