ALPHA-OLEFIN POLYMERIZATION PROCESS Russian patent published in 1998 - IPC

FIELD: polymerization processes. SUBSTANCE: invention relates to process involving continuous vapor-phase alpha-olefin polymerization in horizontal cooled agitated-bed reactor, in particular, to controlling such process in order to produce polymer with specified characteristics. Method of controlling copolymerization reaction with specified characteristics, at least one value of the melt fluidity speed and weight percentage of the second monomer in copolymer formation process, for each reactor, includes: (i) determining relationship between polymer product melt fluidity speed and combination of parameters including: cooling liquid and recycle vapor introduction rates, latent heat of vaporization of cooling liquid, total weight of a particular polymer product in reactor and share of total polymer weight in each zone of reactor, hydrogen/first monomer molar ratio, molar ratio of the second metal co-catalyst to the first metal of catalyst of catalytic system, and temperature and pressure in reactor; (ii) regulating combination of parameters; (iii) computation of fluidity speed of polymer melt leaving reactor utilizing combination of parameters regulated in step (ii) and relationship from step (i); and (iv) exactly determining value of at least one operation variable in the range from minimum to maximum values to determine and adjust speed of computed polymer melt flow to a specified value. EFFECT: enhanced process efficiency. 11 cl, 2 dwg, 1 tbl