This work presents a study on the effect of variable concentrations of different molecular weight fractions of dextran on the crystallization of sucrose. Overall linear growth rates of sucrose crystals were determined in a batch crystallizer at 40 and 50 °C, and the interfacial free energies and kinetic coefficients of the growth were evaluated. The obtained results show different effects of dextran on the sucrose growth rates. At 40 °C, dextran increased the overall growth rate; however the opposite occurred at 50 °C. It was concluded that dextrans-reducing effect on the interfacial free energy increased the overall growth rate at 40 °C, and at 50 °C dextran-reducing effect of the growth kinetic coefficients resulted in lower growth rates of sucrose crystals.
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