STUDIES ON TI-MG SUPPORTED CATALYSTS FOR THE GAS-PHASE POLYMERIZATIONOF ETHYLENE - THE INFLUENCE OF PROPERTIES AND MORPHOLOGY OF PARTICLE OF CATALYST ON THE GAS-PHASE POLYMERIZATION OF ETHYLENE AND THE MORPHOLOGY OF THE PRODUCT

Two kinds of Ti-Mg supperted catalysts for gas-phase polymerization of ethylene were studied. The Ti3+ content in the milling-made catalyst (CM type) containing titanium 3.4% similar to 4.0% by mass is 15% simi lar to 25% of the total titanium. The surface area of the catalyst and catalytic activity for the polymerization are 130 m(2)/g and 9.20 kg PE/(gTi . h). The polymerization showed quickly decaying kinetics, The Ti3+ content in the reacting-made catalyst (MG-2 type) containing tit anium 7.0% similar to 8.0% by mass is 55% similar to 69% of the total titanium. The surface area of the catalyst and catalytic activity are 78 m(2)/g and 4.45 kgPE/(gTi . h). The polymerization was relative ste ady. The average value of diameter (D-av) and D-avmax/D-avmin of the C M and MG-2 catalyst particles are 6.8 mu m, 33 mu m and 9.2, 7.0, resp ectively, and corresponding values of polymerization product PE partic les are 155 mu m, 263 mu m, and 10.8, 9.0, respectively. The results i ndicated that the morphology of the polymerization product reproduced that of the catalyst particle.