Ezzat Abdelrahman O, Al-Lohedan Hamad A, Atta Ayman M
Surfactants Research Chair, Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
ACS Omega. 2021 Feb 5;6(7):5061-5073. doi: 10.1021/acsomega.1c00188. eCollection 2021 Feb 23.
Preparation of new green oilfield chemicals based on ionic liquids (ILs) having higher demulsification efficiency to solve the heavy crude oil brine water emulsions became a target in the petroleum research studies and industry. In the present work, the combination of pyridinium, imidazolium, and hydrophilic or hydrophobic moieties in the chemical structure of ILs has been investigated to improve the surface properties of ILs in both bulk solution and interfaces. Aminopyridine was quaternized with cetylbromide and condensed with glyoxal and 4-hydroxybenzaldehyde in acetic acid to prepare imidazolium-pyridinium bromide acetate ionic liquid (IPy-IL). The phenol group of IPy-IL was etherified with tetraethylene glycol to alter its amphiphilicity and synthesize new amphiphiles (AIPy-IL). Their chemical structure, thermal characteristics, and stabilities were characterized. Their aqueous solution performance in seawater was evaluated to investigate their surface activity, aggregation particle sizes, and surface charges. The demulsification performances of the prepared Arabic heavy crude oil seawater emulsions in the presence of different concentrations of IPy-IL and AIPy-IL were evaluated and proved by interfacial tension, particle size, and demulsification efficiencies at a temperature of 45 °C. The data concluded that AIPy-IL was an effective demulsifier for different crude oil seawater emulsion compositions at a low injection dose and temperature of 100 ppm and 45 °C, which were not report elsewhere.
制备具有更高破乳效率的基于离子液体（ILs）的新型绿色油田化学品，以解决稠油盐水乳液问题，已成为石油研究和工业领域的一个目标。在本工作中，研究了离子液体化学结构中吡啶鎓、咪唑鎓以及亲水或疏水部分的组合，以改善离子液体在本体溶液和界面中的表面性质。用十六烷基溴对氨基吡啶进行季铵化，并在乙酸中与乙二醛和4-羟基苯甲醛缩合，制备咪唑鎓-吡啶鎓溴化乙酸盐离子液体（IPy-IL）。IPy-IL的酚基用四甘醇进行醚化，以改变其两亲性并合成新型两亲物（AIPy-IL）。对它们的化学结构、热特性和稳定性进行了表征。评估了它们在海水中的水溶液性能，以研究其表面活性、聚集粒径和表面电荷。在45℃的温度下，通过界面张力、粒径和破乳效率评估并证明了所制备的阿拉伯稠油海水乳液在不同浓度的IPy-IL和AIPy-IL存在下的破乳性能。数据表明，AIPy-IL在100 ppm的低注入剂量和45℃的温度下，对不同原油海水乳液组成是一种有效的破乳剂，这在其他地方尚未见报道。
