摘要
在内径25mm的连续逆流超临界流体萃取筛板塔中,对超临界二氧化碳/乙醇/水和二氧化碳/异丙醇/水2种体系的流体力学特性和传质性能进行了实验研究;对实验数据进行了分析处理,得到了描述超临界流体萃取筛板塔流动特性的关联式,应用柱塞流模型对超临界流体萃取筛板塔的传质性能进行了模拟计算.
A study on hydrodynamics and mass transfer characteristics was carried out in acontinuous counter-current sieve - tray extraction column of 25mm in diameter operated in the supercritical solvent region. The supercritical systems studied were carbon dioxide / ethanol / water and carbon dioxide / isopropanol /water. Correlation of all experimental data gave the following flow equation for a supercritical fluid extraction sieve - tray column:
Where v=221. 32 m/h, n = 0. 54, m=- 0. 18 for carbon dioxide /ethanol /water system,
v=195. 82 m/h, n = 0. 54, m= - 0. 03 for carbon dioxide / isopropanol / water system.
The experimental data under steady state were used to estimate the parameters of mass transfer , NOLP , HOLP and KOLa, with a plug - flow model.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1993年第1期26-33,共8页
CIESC Journal
基金
化工部发展基金
国家自然科学基金资助项目
关键词
超临界萃取
筛板塔
流体动力学传质
supercritical fluid extraction sieve - tray column, continuous countercurrent, hydrodynamics , mass transfer
