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- Title
Separation of crude oil-in-water emulsions using ethylenediamine modified rice husks.
- Authors
Shen, Liwei; Liu, Tianqi; Huang, Kecang; Zhang, Dalei; Luo, Xincai; Yang, Ying; Feng, Xuening; Zhang, Zejun; Ye, Fan; Mi, Yuanzhu
- 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 (WT) and corresponding oil removal efficiency (WR) 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 WT and WR 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.
- Subjects
RICE hulls; ETHYLENEDIAMINE; EMULSIONS; FOURIER transform infrared spectroscopy; OIL-water interfaces; BIOSURFACTANTS
- Publication
Cellulose, 2022, Vol 29, Issue 18, p9803
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-022-04860-8