Precipitating Characteristics of Potassium Bicarbonate Using Concentrated Potassium Carbonate Solvent for Carbon Dioxide Capture. Part 2: Crystal Growth

Abstract

Crystallization kinetics of potassium bicarbonate in the potassium carbonate (K2CO3)-potassium bicarbonate (KHCO3)-water (H2O) ternary solvent system were estimated using focused beam reflectance measurement (FBRM) in unseeded batch cooling experiments. Two groups of experiments including apparent K2CO3 concentrations of 35 and 40 wt %, both with 0.4 loading, at different constant cooling rates were conducted. KHCO3 was the only precipitate in the ternary system. The concentration of KHCO3 measured by autotitration and chord length distribution collected from FBRM were used to estimate the parameters required for the primary nucleation, secondary nucleation, and growth rate models through ma..