应用动态测定法评价媒晶剂的研究  

Assessment of Addition Agent of Crystallization with Dynamic Method

作　　者：王静康[1] 欧阳胜利[1] 张远谋 

机构地区：[1]天津大学化工系

出　　处：《化工学报》1990年第5期525-531,共7页CIESC Journal

摘　　要：本研究根据粒数平衡理论,建立了间歇结晶过程的数学模型,并应用拉氏变换法将该偏微分方程简化为常微分方程求解,在此基础上发展了测定结晶动力学的动态测定法.用该测定法,以联碱生产中NH_4Cl冷析与盐析结晶为典型过程,测定和比较了多种媒晶剂作用下结晶动力学参数的变化,进而提供了一套以结晶动力学数据为依据的评比媒晶剂的新方案,该方案简易可行,有相对的准确性.测定实验过程中,所需的大量结晶样品的粒度分布值,是应用Coulter Counter粒度计测定的,并应用了Gauss-Newton多元非线性统计回归方法处理数据,计算了结晶动力学参数值.This paper introduces a mathematical model for batch processes of crystallization according to the theory of population balance and uses Laplace transformation in its solution. On its basis a dynamic method to measure the kinetics of crystallization is developed and used for the determination and comparison of the change of kinetic parameters with different addition agents for the cooling and salting-out crystallization of NH4C1 in the production of alkali. A new method for selecting addition agent based upon dynamic data of crystallization is advanced. It is found to be easy, feasible and relatively precise. In the experiment the Coulter-counter was used to measure the required data of CSD from a large number of samples and the parameters for the kinetics of crystallization was fitted by the use of multi-variable nonlinear regression.

关 键 词：晶体 结晶 媒晶剂 动态测定法 

分 类 号：O78[理学—晶体学]