High-activity catalyst for polymerization of propylene
Some results of investigation performed in the Institute of Heavy Organic Synthesis on the preparation and application of titanium-magnesium catalyst for polymerization of propylene have been presented. The properties of catalyst prepared by prolonged grinding of anhydrous MgCl2 with the equimolar complex TiCl4·C6H5COOC2H5 have been studied, and the surface structure, crystallinity and activity of the catalyst have been determined in the process of polymerization of propylene. The specific surface of catalyst is considerably increased during grinding of MgCl2 with the complex. Simultaneously the crystallinity degree is decreased due to titanium compound built-in into the lattice of magnesium chloride. The crystallinity of the catalyst, compared with the initial one of MgCl2, has been changed due to the change in its porous structure, connected with the increase of the number of cracks of the specified width of pores. The presence of the great number of cracks is advantageous since the active centers can be formed. The characteristic feature of the catalysts, prepared in this work and applied together with AlEt3, is their 40—70 times higher activity for polymerization of propylene as compared with the typical catalyst system, however their stereospecific effectiveness is very Iow.
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