METHOD OF CONTROLLING MOLECULAR PARAMETERS IN SOLUTION DIENE POLYMERIZATION PROCESSES Russian patent published in 1999 - IPC

FIELD: polymer production. SUBSTANCE: method, in particular, is designed for qualitatively controlling average-viscosity molecular weight and polydispersion. When carrying out process, one measures concentration of polymer in polymerization reactor, medium temperature, pressure gradients in two different- diameter sections of connected-in-parallel process pipelines, medium density in pipelines, and flows in each section, after which information obtained is processed using following formulas: where M_v is average-viscosity molecular weight, K_p polydispersion coefficient, Q₁, Q₂ medium flows in the first and second pipeline sections, ΔP₁, ΔP₂ pressure gradients in the first and second pipeline sections, L₁, L₂ of the first and second pipeline sections, R₁, R₂ radii of the first and second pipeline sections, R_cur current pipeline radius, R_con constructional pipeline radius, ρ density of polymer, ρ_m density of medium, ρ_pi density of medium in linear pipeline section, C_p concentration of polymer in reactor, T medium temperature, and R absolute gas constant. EFFECT: improved parameter evaluation accuracy in continuous polymer synthesis. 1 dwg