Abstract:

The study of  crystallization kinetics could provide  the basic data for crystallizer design, scale-up, optimization and control of the crystallization process. The solubility of glyphosate in its synthesis mother liquor was  experimentally measured. The crystallization kinetics of glyphosate in its synthesis mother liquor was also experimentally measured in a mixed suspension mixed product removal (MSMPR) crystallizer. The size-independent crystal growth rate model  determined by the linear extrapolation population density distribution, the size-dependent crystal growth rate model, and the  nucleation rate model  determined by  the extrapolated population density distribution to the zero-size crystals were obtained. The experimental results showed that the solubility of glyphosate increased with the temperature increasing, which could make  cooling crystallization  possible for crystallizing glyphosate. The glyphosate crystal growth rate was size-dependent, and the suspension density and energy input had little effect on nucleation rate under experimental conditions.

Key words:  crystallization kinetics, glyphosate, solubility, MSMPR