De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

doi:10.1016/j.cjche.2018.04.027

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (10): 2048-2054.DOI: 10.1016/j.cjche.2018.04.027

• Separation Science and Engineering • 上一篇下一篇

De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

Ling Lü^1,2, Kejing Wu¹, You Tang¹, Siyang Tang¹, Bin Liang¹

1 Multi-phases Mass Transfer and Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 College of Chemical Engineering and Chemistry Technology, Southwest Petroleum University, Chengdu 610500, China

收稿日期:2018-02-23 修回日期:2018-04-26 出版日期:2018-10-28 发布日期:2018-11-14
通讯作者: Bin Liang,E-mail address:liangbin@scu.edu.cn

De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

Ling Lü^1,2, Kejing Wu¹, You Tang¹, Siyang Tang¹, Bin Liang¹

1 Multi-phases Mass Transfer and Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 College of Chemical Engineering and Chemistry Technology, Southwest Petroleum University, Chengdu 610500, China

Received:2018-02-23 Revised:2018-04-26 Online:2018-10-28 Published:2018-11-14
Contact: Bin Liang,E-mail address:liangbin@scu.edu.cn

摘要/Abstract

摘要： Low-speed rotation of disc in an internal circulation of a novel de-emulsification with rotation-dise horizental contactor (RHC-D) realized de-emulsification for O/W emulsions due to repeated coalescence in oil-wet narrow channels at a low rotation speed. For three emulsions included ethanol/water/2-ethyl-1-hexanol, ethanol/water/2-ethyl-1-hexanol/SDS (Sodium Dodecyl Sulfonate) and 2-ethyl-1-hexanol/water/SDS emulsion, deemulsification ratios of oil phase could reach 1, 1 and 0.67 respectively at 170 r·min^-1, and de-emulsification ratios increased obviously after agitating 10 min. De-emulsification experiment in the seam indicated that oil droplet sizes in O/W emulsion became larger after de-emulsification. The main de-emulsification mechanism in RHCD was the coalescence of oil droplets in oil-wet narrow channels. With increase of the rotation speed, oil droplets dispersed better in the aqueous phase. However, de-emulsification effect enhanced due to the increase of the coalescence rate at a bit higher rotation speed. In addition, internal circulation made those O/W emulsions to be broken repeatedly, consequently de-emulsification ratio increased. Repeated de-emulsification through internal circulation might make continuous extraction of ethanol come true at a low rotation speed.

关键词: De-emulsification, Oil-wet channel, Low rotation speed, O/W emulsion, Internal circulation

Abstract: Low-speed rotation of disc in an internal circulation of a novel de-emulsification with rotation-dise horizental contactor (RHC-D) realized de-emulsification for O/W emulsions due to repeated coalescence in oil-wet narrow channels at a low rotation speed. For three emulsions included ethanol/water/2-ethyl-1-hexanol, ethanol/water/2-ethyl-1-hexanol/SDS (Sodium Dodecyl Sulfonate) and 2-ethyl-1-hexanol/water/SDS emulsion, deemulsification ratios of oil phase could reach 1, 1 and 0.67 respectively at 170 r·min^-1, and de-emulsification ratios increased obviously after agitating 10 min. De-emulsification experiment in the seam indicated that oil droplet sizes in O/W emulsion became larger after de-emulsification. The main de-emulsification mechanism in RHCD was the coalescence of oil droplets in oil-wet narrow channels. With increase of the rotation speed, oil droplets dispersed better in the aqueous phase. However, de-emulsification effect enhanced due to the increase of the coalescence rate at a bit higher rotation speed. In addition, internal circulation made those O/W emulsions to be broken repeatedly, consequently de-emulsification ratio increased. Repeated de-emulsification through internal circulation might make continuous extraction of ethanol come true at a low rotation speed.

Key words: De-emulsification, Oil-wet channel, Low rotation speed, O/W emulsion, Internal circulation

Ling Lü, Kejing Wu, You Tang, Siyang Tang, Bin Liang. De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation[J]. Chinese Journal of Chemical Engineering, 2018, 26(10): 2048-2054.

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De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

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