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J. P. Delgrange, T. M. B. Wilson


BP fluidized bed process for polyethylene production - (in English)


Polimery 1984, No 10-11-12, 402



DOI: dx.doi.org/10.14314/polimery.1984.402


Summary


The BP fluidized bed process was the first to combine superactive Ziegler catalysts with the advantages of fluidized bed polymerization. A commercial 40 000 tonnes/annum plant has been operating at Lavera since 1975, and a 100 000 tonnes/annum LLDPE/HPDE plant at Lavera will be completed during 1985. Ziegler catalysts have been developed in the BP Chimie laboratories since 1958. By means of a simple adjustment of the ratio of reactants, the density and melt index of products can be controlled in the range of 0.965—0.910 and 0.5—50, respectively. The fluidized bed process was developed simultaneously with the superactive Ziegler catalysts. The powder morpho­logy and fluicization conditions have been optimized. The excellent temperature control within the fluidized bed virtually eliminates hot spots in reactor which, in turn, is a simple way of avoiding the production of agglomerates and achieving high on-stream time efficiency and clean and homogeneous products. The products commercialized include HDPE grades for injection and rotational moulding, and LLDPE grades for film applications, rotational moulding and injection moulding.


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