Hydrophobically modified sodium humate surfactant: Ultra-low interfacial tension at the oil/water interface

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• 作者：Jianmei Zhang ; Gang Li ; Fang Yang ; Nian Xu ; Hongxian Fan ; Tao Yuan ; Lin Chen
• 关键词：Hydrophobically modified sodium humate surfactant ; Sodium phosphate ; n-Propanol ; Ultra-low interfacial tension
• 刊名：Applied Surface Science
• 出版年：2012
• 出版时间：15 October, 2012
• 年：2012
• 卷：259
• 期：Complete
• 页码：774-779
• 全文大小：579 K

文摘

Hydrophobically modified sodium humate surfactants with different chain lengths (C_n-HANa, n = 10, 12, 14, 18) were synthesized in this paper and the molecular structures were confirmed by FT-IR and UV-vis spectra. The effects of C_n-HANa, alcohol (ethanol, n-propanol, iso-propanol, n-butbanol) and alkaline (KOH, NaOH, Na₂CO₃, Na₃PO₄¡¤12H₂O, NaOH:Na₂CO₃) on the interfacial tension of oil/water interface were investigated by KRUSS SITE-100 spinning drop interfacial tension apparatus. Ultra-low interfacial tension related to enhanced oil recovery (EOR) was obtained at the crude oil/water interface from the mixture solution of the C_n-HANa surfactant, Na₃PO₄¡¤12H₂O and n-propanol. The experimental results show that hydrophobic modification of sodium humate surfactants cause low interfacial tension at the crude oil/water interface as compared with those of the single sodium humate. While the interfacial tension of the C_n-HANa/crude oil interface could reach to 10^?1 mN/m, the interfacial tension of the C_n-HANa/Na₃PO₄¡¤12H₂O/crude oil system, in aqueous solution, decreases so much that sometimes it is less than 10^?4 mN/m. Furthermore, n-propanol is added to the C₁₀-HANa/Na₃PO₄¡¤12H₂O/crude oil system, it can make the range of the ultra-low interfacial tension extend from 0.20-0.30 % to 0.20-0.70 % for Na₃PO₄¡¤12H₂O, and the minimum interfacial tension is 5.27 ¡Á 10^?5 mN/m at Na₃PO₄¡¤12H₂O concentration about 0.35 % .