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28.09.2022 | Original Research

Separation of crude oil-in-water emulsions using ethylenediamine modified rice husks

verfasst von: Liwei Shen, Tianqi Liu, Kecang Huang, Dalei Zhang, Xincai Luo, Ying Yang, Xuening Feng, Zejun Zhang, Fan Ye, Yuanzhu Mi

Erschienen in: Cellulose | Ausgabe 18/2022

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Abstract

A large number of stable oil-in-water (O/W) emulsions are generated by the petroleum industry each year, resulting in a series of operational and environmental challenges. In this study, a RH-NH₂ demulsifier was prepared for the separation of O/W emulsions by grafting ethylenediamine onto natural rice husk. RH-NH₂ was characterized using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). When the dosage of RH-NH₂ was 50 mg/L, the light transmittance (W_T) and corresponding oil removal efficiency (W_R) of the separated water were 90.2 ± 1.8% and 94.82 ± 0.95%, respectively, in the emulsion-0.2 (containing 0.2% crude oil). When the dosage was 200 mg/L, the W_T and W_R values of the emulsion-1 (with 1% crude oil) were 91.9 ± 0.9% and 99.14 ± 0.1%, respectively. In addition, dynamic interfacial tension (IFT), wettability, zeta potential, interfacial activity and adsorption capability of RH-NH₂ at the interface were also investigated. The results showed that the IFT values of asphaltene and RH-NH₂ (200 mg/L) was 22.58 mN/m and 16.42 mN/m, respectively. The zeta potential of the O/W emulsion was − 37 ± 1.8 mV while that of RH-NH₂ was 20.8 ± 1.0 mV, which facilitated the electrostatic neutralization and reduced the electrostatic repulsion between oil droplets. A possible demulsification mechanism was proposed, which indicated that RH-NH₂ was amphiphilic, with high interfacial activity and stronger capability to reduce IFT. It migrated rapidly to the oil–water interface and disrupted the interfacial film via synergistic effect of the π-π/n-π interaction, leading to demulsification. RH-NH₂ has a potential industrial application due to its low-cost and high demulsification efficiency.

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Titel: Separation of crude oil-in-water emulsions using ethylenediamine modified rice husks
verfasst von: Liwei Shen
Tianqi Liu
Kecang Huang
Dalei Zhang
Xincai Luo
Ying Yang
Xuening Feng
Zejun Zhang
Fan Ye
Yuanzhu Mi
Publikationsdatum: 28.09.2022
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 18/2022
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-022-04860-8

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