Research and engineering at the Polski Koncern Naftowy S.A. polypropylene plant at Płock
Polimery 2000, No 5, 358
SummaryThe propylene polymerization (30 000 ton PP/year) installations run on Ziegler—Natta generation I and II catalysts were modernized by using generation III and IV catalysts, which are highly active and stereoregular. The installations were modernized by eliminating the methanol-water wash step and the methanol recovery step. In the hexane used as solvent, fraction recyclates were used, 28 and 42%. The production capacity was raised to 100 000 ton PP/year. The old and the modernized block diagrams are shown (Figs. 1, 2), polymerization runs over seven catalyst systems are summarized (Tables 1, 2, 4) and physicochemical property data are given for the polymers obtained (Table 3).