环形旋流反应器反应结晶法制备无机盐颗粒  

Preparation of Inorganic Salt Particles by Reactive Crystallization in an Annular Swirling Flow Reactor

作　　者：冯超超 王伟伟 肖王泽 李翔 罗港 唐艳玲 黄子宾[1] 程振民[1] FENG Chaochao;WANG Weiwei;XIAO Wangze;LI Xiang;LUO Gang;TANG Yanling;HUANG Zibin;CHENG Zhenmin(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化学反应工程与工艺》2025年第1期172-182,共11页Chemical Reaction Engineering and Technology

基　　金：国家重点研发计划(2019YFC1906405)。

摘　　要：采用一种带有中心轴结构的环形旋流反应器,以液-液混合反应方式制备无机盐颗粒,探究该设备在反应结晶方面的优势。通过计算流体力学(CFD)模拟分析环形旋流反应器的流动特性,包括压降、停留时间、速度梯度、湍流动能和剪切率等。随后,向反应液中加入羧甲基纤维素钠(CMC),研究反应液黏度对碳酸钙颗粒结晶的影响。CFD模拟显示,该旋流反应器具有压降低(<5kPa)、平均停留时间短(<2s)、旋流段稳定且存在较高的速度梯度、高湍流动能、高剪切率、高液-液混合程度的特点,其内部流型类似于平推流,可使无机盐颗粒有近似相同的生长时间,有利于获得粒径均一的碳酸钙颗粒。加入CMC后,得到的碳酸钙晶型为方解石和球霰石。相较于搅拌设备,旋流反应器合成的碳酸钙颗粒粒径更均匀,表面更光滑,平均粒径为4~6μm,标准偏差为1.0~1.6μm,说明旋流反应器在反应结晶方面具有独特优势。An annular swirling flow reactor with a central axis structure was used to prepare inorganic salt particles in a liquid-liquid mixing reaction,aiming to explore its advantages in reactive crystallization.Computational fluid dynamics(CFD)simulations were conducted to analyze the reactor’s flow characteristics,including parameters such as pressure drop,residence time,velocity gradient,turbulent kinetic energy,and shear rate.Sodium carboxymethyl cellulose(CMC)was subsequently added to the reaction system to investigate the effect of viscosity on calcium carbonate crystallization.CFD simulations revealed that the swirling flow reactor was characterized by a low-pressure drop(<5 kPa),a short average residence time(<2 s),a stable swirling section with high-velocity gradients,high turbulent kinetic energy,high shear rate,and a high degree of liquid-liquid mixing.The flow pattern resembled plug flow,ensuring nearly uniform growth time for inorganic salt particles and thereby facilitating the preparation of calcium carbonate particles with uniform particle size.After adding CMC,the crystal forms of calcium carbonate were calcite and vaterite.Compared with the stirring equipment,the calcium carbonate particles synthesized by the swirling flow reactor were more uniform in particle size and smoother in surface,with an average particle size of 4-6μm and a standard deviation of 1.0-1.6μm,illustrating that the swirling flow reactor has unique advantages in reactive crystallization.

关 键 词：旋流反应器 数值模拟 反应结晶 

分 类 号：TQ027[化学工程]