胶乳汽提脱除单体的机理及数学模型

MECHANISM AND MATHEMATICAL MODEL FOR MONOMER REMOVAL FROM LATEX BY STRIPPING

本文研究了丁苯吡胶乳的脱气机理,实验证明了这个包括有多个传质阶段的复杂传质过程是由单体从胶粒内扩散到表面并穿过界面进入液相的传质阶段所控制。从这一机理出发,选择了脱气过程的工艺条件。通过简化脱气过程的物理模型,从理论上推导出脱气过程的数学模型,并用实验证实了这一模型。通过对多种胶乳及各种脱气设备的应用,证明该模型具有普遍性。本文提出用定义的脱气速度常数来研究和设计脱气过程的方法。

Investigation have been made on the mechanism for monomer removal from latex by stripping. Experiments show that this complex process involving several mass transfer steps is controlled by the step in which monomer deffuses from the interion of a particle to its surface and across the solidliquid interface: Based on this mechanism, the process conditions of the stripping were selected. The simplified physical model of the process was suggested and the mathematical model was derived theoretically. An empirical correlation obtained from the experimental data is exactly consistent with the model derived. This model was applied to several kinds of latices and to several types of stripping equipments. It is proved that this model is satisfactory for the simulation of the latex stripping processes. The method for studing and designing latex stripping process was proposed in terms of the stripping rate constant defined in the paper.