Qu Qian, Li Huan, Li Shuman, Hu Zhijie, Zhu Mingzhao, Chen Junhong, Sun Xuebiao, Tang Yuqi, Zhang Zejun, Mi Yuanzhu, Yu Weichu
School of Chemistry & Environmental Engineering, Yangtze University, Jingzhou, 434023, PR China.
National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Research Institute of Exploration and Development of PetroChina Changqing Oil Field Company, Xi'an, 710001, PR China.
Chemosphere. 2023 Nov;340:139802. doi: 10.1016/j.chemosphere.2023.139802. Epub 2023 Aug 18.
Stable emulsions can have numerous negative impacts on both the oil industry and the environment. This study focuses on the synthesis of two ionic liquids (via. PPBD and PPBH) with four hydrophobic branches and four ionic centers that can effectively treat oil-water emulsions at a low temperature of 40 °C. Their chemical structure was explored using Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectra (H NMR). The effect of temperature, PPBD and PPBH concentration, oil-water ratio, salinity and pH value on the demulsification efficiency (DE) of W/O emulsion was studied detailly and several commercial demulsifiers were also used for comparison. Results revealed that by adding 250 mg/L of PPBH in an E30 emulsion and leaving it for 120 min at 40 °C, the DE could reach 96.34%. Meanwhile, in an E30 emulsion (oil-water mass ratio of 3:7) with 250 mg/L of PPBD, the DE of 95.23% could be obtained at 40 °C for 360 min. Especially, the DE of PPBH could reach 100% in an E70 emulsion (oil-water mass ratio of 7:3) at the same conditions. Additionally, the demulsifier (PPBH) exhibited excellent salt resistance and outperformed some commonly used commercial demulsifiers. Several methods were utilized to investigate the potential demulsification mechanism, including measuring interfacial tension (IFT), three-phase contact angle (CA), droplet contact time, zeta potential, and observing samples under optical microscopy.
稳定乳液会对石油工业和环境产生诸多负面影响。本研究聚焦于合成两种具有四个疏水支链和四个离子中心的离子液体（通过PPBD和PPBH），它们能够在40°C的低温下有效处理油水乳液。利用傅里叶变换红外光谱（FT-IR）和核磁共振氢谱（H NMR）对其化学结构进行了探究。详细研究了温度、PPBD和PPBH浓度、油水比、盐度和pH值对W/O乳液破乳效率（DE）的影响，并使用了几种商业破乳剂进行比较。结果表明，在E30乳液中添加250mg/L的PPBH并在40°C下放置120分钟，破乳效率可达到96.34%。同时，在含有250mg/L PPBD的E30乳液（油水质量比为3:7）中，在40°C下放置360分钟可获得95.23%的破乳效率。特别地，在相同条件下，PPBH在E70乳液（油水质量比为7:3）中的破乳效率可达到100%。此外，该破乳剂（PPBH）表现出优异的耐盐性，性能优于一些常用的商业破乳剂。利用多种方法研究了潜在的破乳机理，包括测量界面张力（IFT）、三相接触角（CA）、液滴接触时间、zeta电位，并在光学显微镜下观察样品。
