An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler

doi:10.1016/j.cjche.2019.07.022

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (1): 33-45.DOI: 10.1016/j.cjche.2019.07.022

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler

Qiao Tang¹, Jiyizhe Zhang¹, Yuxin Wu¹, Yundong Wang¹, Zuohua Liu²

1 State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
2 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China

收稿日期:2019-04-25 修回日期:2019-06-06 出版日期:2020-01-28 发布日期:2020-03-31
通讯作者: Yundong Wang, Zuohua Liu
基金资助:
Supported by the National Natural Science Foundation of China (NSFC) (21636004), the National Safety Academy Foundation (U1530107), the National Basic Research Program of China (2012CBA01203).

An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler

Qiao Tang¹, Jiyizhe Zhang¹, Yuxin Wu¹, Yundong Wang¹, Zuohua Liu²

1 State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
2 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China

Received:2019-04-25 Revised:2019-06-06 Online:2020-01-28 Published:2020-03-31
Contact: Yundong Wang, Zuohua Liu
Supported by:
Supported by the National Natural Science Foundation of China (NSFC) (21636004), the National Safety Academy Foundation (U1530107), the National Basic Research Program of China (2012CBA01203).

摘要/Abstract

摘要： Drop size distribution (DSD) or mean droplet size (d₃₂) and liquid holdup are two key parameters in a liquid-liquid extraction process. Understanding and accurately predicting those parameters are of great importance in the optimal design of extraction columns as well as mixer-settlers. In this paper, the method of built-in endoscopic probe combined with pulse laser was adopted to measure the droplet size in liquid-liquid dispersions with a pump-impeller in a rectangular mixer. The dispersion law of droplets with holdup range 1% to 24% in batch process and larger flow ratio range 1/5 to 5/1 in continuous process was studied. Under the batch operation condition, the DSD abided by log-normal distribution. With the increase of impeller speed or decrease of dispersed phase holdup, the d₃₂ decreased. In addition, a prediction model of d₃₂ of kerosene/deionized system was established as d₃₂/D=0.13(1+5.9φ)We^-0.6. Under the continuous operation condition, the general model for droplet size prediction of kerosene/water system was presented as d₃₂/D=C₃(1+C₄φ)We^-0.6. For the surfactant system and extraction system, the prediction models met a general model as d₃₂/D=bφⁿWe^-0.6.

关键词: Dispersion, Droplet size distribution, Liquid-liquid, Mean drop size, Mixer-settler

Abstract: Drop size distribution (DSD) or mean droplet size (d₃₂) and liquid holdup are two key parameters in a liquid-liquid extraction process. Understanding and accurately predicting those parameters are of great importance in the optimal design of extraction columns as well as mixer-settlers. In this paper, the method of built-in endoscopic probe combined with pulse laser was adopted to measure the droplet size in liquid-liquid dispersions with a pump-impeller in a rectangular mixer. The dispersion law of droplets with holdup range 1% to 24% in batch process and larger flow ratio range 1/5 to 5/1 in continuous process was studied. Under the batch operation condition, the DSD abided by log-normal distribution. With the increase of impeller speed or decrease of dispersed phase holdup, the d₃₂ decreased. In addition, a prediction model of d₃₂ of kerosene/deionized system was established as d₃₂/D=0.13(1+5.9φ)We^-0.6. Under the continuous operation condition, the general model for droplet size prediction of kerosene/water system was presented as d₃₂/D=C₃(1+C₄φ)We^-0.6. For the surfactant system and extraction system, the prediction models met a general model as d₃₂/D=bφⁿWe^-0.6.

Key words: Dispersion, Droplet size distribution, Liquid-liquid, Mean drop size, Mixer-settler

Qiao Tang, Jiyizhe Zhang, Yuxin Wu, Yundong Wang, Zuohua Liu. An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler[J]. 中国化学工程学报, 2020, 28(1): 33-45.

Qiao Tang, Jiyizhe Zhang, Yuxin Wu, Yundong Wang, Zuohua Liu. An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler[J]. Chinese Journal of Chemical Engineering, 2020, 28(1): 33-45.

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An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler

An experimental study of immiscible liquid-liquid dispersions in a pump-mixer of mixer-settler

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