Abstract:

A series of additives were introduced to crystallization process of ammonium sulfate, and different forms of ammonium sulfate crystal were obtained.The crystallization process was studied based on experiments and computer simulation.The effect of crystallization additives on morphology of ammonium sulfate was investigated.The ammonium sulfate crystals were characterized by XRD and SEM analysis to examine crystal habit and crystal form.Materials Studio is employed to calculate molecule binding energies between additive ions and ammonium sulfate crystal surfaces.The results indicate that the values of binding energy have certain relationship with growth rates of crystal faces, which illustrates the effects of impurities and additive ions on crystal habit of ammonium sulfate.Molecule binding energy of cationic additives is higher than that of molecules.The higher valence of cationic additive is, the higher molecule binding energy is.Based on the kinetic data and molecular simulation results, the effect mechanism of different impurities on crystallization is analyzed.