摘要
采用Y型和线型微通道反应器,成功制备出平均粒径为35～110nm、无因次方差为0.2～0.3的纳米BaSO4颗粒;同时利用TEM、BET及XRD分别对微反应器和普通反应釜合成的硫酸钡粉体性质进行了表征。实验结果表明,反应物流量增大,混合效率提高,平均粒径及方差下降;初始浓度或体积流量比增加,粒径下降;在相同的工艺条件下,通过较大尺寸Y型微反应器制备的颗粒粒径及方差略大于小尺寸Y型合成的,而线型微反应器合成的产物粒子粒径最小。
BaSO4 powders were prepared by Y-type, line-type microchannel reactors and stirred tank, respectively. The particle size and morphology were characterized by TEM, while the quality of synthetic BaSO4 powder was confirmed by XRD and BET. The effects of various operational conditions, such as initial reactant concentration and volume flow rate, on particle size distribution of precipitates were studied as well. The results show that the ranges of mean particle size and dimensionless variance of BaSO4 prepared by microreactors are 35-110 nm and 0.2-0.3, respectively, they are far smaller than those prepared by stirred tank. Furthermore, mean particle size of BaSO4 prepared by micro-reactors decreases with the increase of liquid flow rate, initial concentration and volumetric ratio of reactants. Under the same operational conditions, the mean particle size of BaSO4 nanoparticles prepared by line-type microreactor is the smallest, and that prepared by a larger dimension Y-type microreactor is slightly bigger than that prepared by the Y-type microreactor with smaller dimension.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第3期474-479,共6页
Journal of Chemical Engineering of Chinese Universities
基金
"863"(2006AA030202/2006AA030203)
国家自然科学基金(20821004
20806004)
关键词
微通道反应器
微观混合
沉淀
BASO4
microchannel reactor
micromixing
precipitation
barium sulfate
