旋转式微通道内液液萃取的流型及传质

doi:10.16085/j.issn.1000-6613.2019-1748

化工进展 ›› 2020, Vol. 39 ›› Issue (8): 3007-3013.DOI: 10.16085/j.issn.1000-6613.2019-1748

旋转式微通道内液液萃取的流型及传质

马睿(), 范椿欣, 罗建洪(), 李军, 钟本和

四川大学化学工程学院，四川成都 610065

出版日期:2020-08-01 发布日期:2020-08-12
通讯作者: 罗建洪
作者简介:马睿（1993—），女，硕士研究生，研究方向为微通道构建及应用。E-mail：marui625@foxmail.com。
基金资助:
国家自然科学基金(21776181);四川大学火花库项目(2018SCUH0012);建设世界级一流大学项目(2030704401004)

Liquid-liquid two-phase flow pattern and mass transfer in a rotating microchannel extractor

Rui MA(), Chunxin FAN, Jianhong LUO(), Jun LI, Benhe ZHONG

School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China

Online:2020-08-01 Published:2020-08-12
Contact: Jianhong LUO

摘要/Abstract

摘要：

利用高速摄影仪观测了2-乙基己基磷酸单2-乙基己基酯（油相）与硝酸铬水溶液（水相）在旋转式微通道（RME）内部的液-液两相流流型，主要观察到了滴状流型（上油下水片状流、滴状片状流、滴状带状流）、带状流型（带状流、紊乱流）、上水下油流型（上水下油滴状流、上水下油片状环状流、上水下油带状流、上水下油丝状流），共3类，9种。考察了微通道设备的尺寸、内筒转速以及进料流速对流型的影响。发现了随着流速和转速的增加，RME内部的流型从滴状流型到带状流型再到上水下油流型的一个转变。进一步利用水油两相的韦伯数将微通道内部的惯性力和黏性力相关联，绘制了流型图，发现了RME内部惯性、黏性力的线性变化关系。最后在9种不同的流型下进行铬的萃取实验，找到了可实现较高萃取级效率的流型。该旋转式微通道内部流型的研究可以为后期的实验和设备的应用奠定基础。

关键词: 旋转式微通道, 流型图, 液液两相流动, 萃取, 传质

Abstract:

The liquid-liquid two-phase flow pattern in rotating microchannel extractor (RME) was observed and recorded by high-speed photography. The extraction of chromium (Ⅲ) from water to an organic phase was selected as the experimental system. Three types and nine kinds of flow patterns were observed, namely, drop flow (sheet flow, drop sheet flow, drop banding flow), banding flow (banding flow, chaotic flow), and aqueous-organic flow (aqueous-organic drop flow, aqueous-organic banding flow, aqueous-organic banding annular flow, aqueous-organic filiform flow). Various factors, such as the size of the microchannel device, the rotating speed of the inner cylinder and the feeding velocity that could change the flow pattern were investigated. It was found that with the increase of flow velocity and rotation speed, the flow pattern in RME underwent drop flow to banding flow and then to aqueous-oil flow. Furthermore, the Weber number of aqueous phase and organic phase were correlated to form the flow pattern diagram, and the linear relationship between the inertial force and viscous force in RME was found. Finally, to find the flow pattern with high extraction efficiency, the extraction experiments of chromium were carried out under nine different flow patterns. This study of the flow pattern in the RME lays the foundation for the later experiments and the application of the device.

Key words: rotating microchannel extractor, flow pattern diagram, liquid-liquid two-phase flow, extraction, mass transfer

中图分类号:

TQ05

马睿, 范椿欣, 罗建洪, 李军, 钟本和. 旋转式微通道内液液萃取的流型及传质[J]. 化工进展, 2020, 39(8): 3007-3013.

Rui MA, Chunxin FAN, Jianhong LUO, Jun LI, Benhe ZHONG. Liquid-liquid two-phase flow pattern and mass transfer in a rotating microchannel extractor[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 3007-3013.

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旋转式微通道内液液萃取的流型及传质

Liquid-liquid two-phase flow pattern and mass transfer in a rotating microchannel extractor

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