SUSPENSION POLYMERISATION METHOD Russian patent published in 2013 - IPC C08F10/02 C08F2/00 C08L23/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing multimodal polyethylene. The method is carried out in at least two reactors with circulation, which are connected in series, where 20-80 wt % of a high-molecular weight polymer is obtained in a suspension in the first reactor and 20-80 wt % of a low-molecular weight polymer is obtained in a suspension in the second reactor. One polymer is obtained in the presence of the other in any order. The ratio of the average effective concentration of substance in the reactor of the low-molecular weight product to the average effective concentration of substance in the reactor of the high-molecular weight product is 0.25-1.5. The average effective concentration of substance in each reactor is defined as output of polyethylene obtained in the reactor (kg PE/h)/[concentration of ethylene in the reactor (mol %) × residence time in the reactor (h) × rate of feeding catalyst (g/h)]. Residence time is defined as the mass of the polymer in the reactor (kg)/rate of removal of the polymer from the reactor (kg/h) and the volumes of the reactors differ by less than 10%.

EFFECT: method of producing multimodal polyethylene in two reactors with optimum ratio of dimensions.

15 cl, 1 tbl, 1 ex