Developments in the commercial manufacture of polypropylene
A comparative evaluation of the commercial methods of polypropylene polymerization in solution, in liquid monomer (bulk polymerization) and in gaseous phase have been compared with regard to their technological convenience, polymer yield and capital costs. The advantages resulting from replacing the classical catalysts of generation I with much more active catalysts of generation II and in particular of generation III (TiCl4) deposited on magnesium chloride modified with electron donors) have been discussed. These advantages consist in a significant simplification of the technological process due to elimination of a number of operations, lower consumption of raw materials and energetic media and higher yield and stereospecifity of PP. The best prospects in this respect have bulk polymerization and polymerization in gaseous phase with the application of highly active catalysts of generation III.
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