Ciagla krystalizacja masowa witaminy c w ukladzie kwas l(+)-askorbinowy- metanol-woda. obliczenia parametrów kinetycznych procesu z wykorzystaniem modelu sdg

The kinetics of the process of continuous mass crystallization of vitamin C from has been investigated in solutions composed of 30-50 wt. % of L(+)-ascorbic acid, 20 wt. % of methanol and from 50 to 30 wt. % of water. The process was run in isothermal conditions (T = 293 K) in a laboratory DT MSMPR type crystallizer. Mean residence time of crystal suspension in the apparatus working volume was adjusted within the 900-3600 s range. For the calculation of nucleation and growth rates of vitamin C, both nuclei (G₀) and crystals (G_∞), the kinetic models of mass crystallization process in MSMPR crystallizer, assuming a size-dependent mechanism of growth (SDG), were adopted. It was concluded that the Rojkowski exponential SDG kinetic model the best fits the experimental data.