杀虫单介稳区宽度的理论计算

从晶体生长成核、动力学等几个方面出发,在Mersmann模型基础上建立了适合高粘度有机体系的介稳区宽度的理论计算模型,确立了计算程序和方法.结合“杀虫单”农药结晶过程的具体参数,计算和预测了工业结晶过程中介稳区的宽度.理论计算值与实验测定值较为接近.该方法可为工业结晶中过饱和度的选择提供参考.

Theoretical Calculation of Metastable Zone Width of Monomehypo Solution

Industrial crystallizers have to be operated at the optimum supersaturation which is less than the metastable zone width to obtain a desired product quality, such as median article size,crystal size distribution, shape and purity. Due to the time-consuming experimental determination of metastable zone width, the theoretical calculation method was studied in this paper. According to the nuclear theory and the dynamics of crystal growth, a theory model based on the model of Mersmann’s was suggested for calculating the metastable zone width of organic system with high viscosity. Also, its computation program was suggested. Combining with the parameters of crystallization process of monomehypo pesticide, the metastable zone width of industrial crystallization process was calculated, and its result is close to the experimental value. This method could be as a model for choosing the supersaturation of industrial crystallization.