电场强化酯交换过程中醇油两相分散特性研究

Dispersion Characteristics for Ethanol-oil System During Transesterification Under Electric Field

电场对相间传质和相分散具有强化作用。为了探究电场强化酯交换反应的作用机理,基于电场作用下碱催化醇油酯交换反应动力学的分析,采用显微高速摄像技术对NaOH作为催化剂的酯交换反应体系中液滴的荷电分散行为及演变过程进行了可视化研究,精确捕捉了不同电场强度下液滴在连续相中荷电破碎的显微形貌特性.结果表明随外加电场强度的增加,液滴在连续相中的荷电破碎速率加快,液滴尺寸显著下降,有利于酯交换反应的强化.

Electric field could intensify interphase dispersion and mass transfer. The reaction kinetics of transesterification intensified by electric field is studied firstly, in order to investigate the intensification mechanism of electric field, high-speed microscopy is applied to visualize the evolution process of charged droplet in ethanol-oil system with NaOH. Micro morphology characteristics of charged droplet in continuous phase are accurately captured under various electric field strengths. The results show that droplet breakup rates are accelerated as the increase of electric field strength while droplet sizes decline sharply, which could form a homogeneous reaction system for transesterification enhancement.