SYSTEMS AND METHODS OF PRODUCING POLYOLEFINS Russian patent published in 2012 - IPC C08F4/28 C08F2/34 C08F4/24 C08F210/02 

FIELD: chemistry.

SUBSTANCE: method involves: determining the optimum operating temperature to obtain polyolefin in a fluidised-bed reactor system; selecting a chromium oxide-based catalyst, which is reduced with diethylaluminium ethoxide (DEA1E), on a dehydrated silicon support depending on the desired properties of the polyolefin achieved at operating temperature; feeding oxygen into the reactor system to provide the reactor system an amount of oxygen which is effective for minimisation of clogging of the fluidised-bed reactor system. The oxygen is fed at a rate which is equivalent to amounts ranging from more than 0 to less than 0.05 ppm oxygen with respect to volume rate of feeding the monomer into the reactor system. The optimum operating temperature is such that the highest temperature in the reactor system less than about 20°C lower than the melting point of polyolefin.

EFFECT: method enables to carry out polymerisation for longer periods of time without the need to stop production for cleaning; furthermore, the effect of oxygen on catalyst efficiency and flow index of the obtained polymer is negligible.

10 cl, 2 dwg, 7 ex