Khosravani Mojtaba, Akhlaghi Naser, Hosseini Seyednooroldin
Department of Chemical Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran.
Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, 63731-93719, Khuzestan, Iran.
Sci Rep. 2024 May 10;14(1):10720. doi: 10.1038/s41598-024-58458-0.
The results revealed the significant effect of NaCl, KCl, CaCl, MgCl, CaSO, MgSO, and NaSO and pH values of 3.5-11 on the interfacial tension (IFT) reduction using three types of neutral, acidic, and basic crude oils, especially for acidic crude oil (crude oil II) as the pH was changed from 3.5 to 11 (due to saponification process). The findings showed the highest impact of pH on the IFT of crude oil II with a reducing trend, especially for the pH 11 when no salts exist. The results revealed that the salts except MgCl and CaCl led to a similar IFT variation trend for the case of distilled water/crude oil II. For the MgCl and CaCl solutions, a shifting point for IFT values was inevitable. Besides, the dissolution of 1-dodecyl-3-methyl imidazolium chloride ([Cmim][Cl]) with a concentration of 100-1000 ppm eliminates the effect of pH on IFT which leads to a reducing trend for all the examined crude oils with minimum IFT of 0.08 mN/m. Finally, the [Cmim][Cl] adsorption (under pH values) for crude oils using only NaSO was measured and the minimum adsorption of 0.41 mg surfactant/g Rock under the light of saponification process was obtained.
结果表明，NaCl、KCl、CaCl、MgCl、CaSO、MgSO和NaSO以及pH值为3.5至11对使用三种类型的中性、酸性和碱性原油降低界面张力（IFT）具有显著影响，特别是对于酸性原油（原油II），随着pH值从3.5变为11（由于皂化过程）。研究结果表明，pH值对原油II的IFT影响最大，呈降低趋势，尤其是在不存在盐的情况下pH值为11时。结果显示，除MgCl和CaCl外，其他盐类在蒸馏水/原油II的情况下导致类似的IFT变化趋势。对于MgCl和CaCl溶液，IFT值不可避免地会出现一个转折点。此外，浓度为100 - 1000 ppm的1 - 十二烷基 - 3 - 甲基咪唑氯化物（[Cmim][Cl]）的溶解消除了pH值对IFT的影响，这导致所有测试原油的IFT呈降低趋势，最低IFT为0.08 mN/m。最后，测量了仅使用NaSO时原油在不同pH值下的[Cmim][Cl]吸附情况，在皂化过程的条件下，获得了最低吸附量为0.41 mg表面活性剂/克岩石。
