Demulsification of water in crude oil emulsion using long chain imidazolium ionic liquids and optimization of parameters
Demulsification of water in crude oil emulsion using long chain imidazolium ionic liquids and optimization of parameters
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DOI：
10.1016/j.fuel.2018.05.010
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发表时间：
2018-10-01
期刊：
影响因子：
7.4
通讯作者：
Abdouss, Majid
中科院分区：
文献类型：
--
作者：
Hazrati, Nastaran;Beigi, Ali Akbar Miran;Abdouss, Majid
在这项工作中，报道了离子液体作为水破乳剂在从原油中分离水中的应用。合成了长烷基链取代的咪唑鎓离子液体(n=10、12和14)，并与Cl、PF6和NTf2阴离子偶联作为表面活性破乳剂。基于阳离子烷基链长度、阴离子类型和IL剂量三个水平三个因素进行全析因设计来优化破乳剂的行为。每轮均测量原油与水之间的界面张力，并在破乳处理后分别在1、2、6和24 h的时间间隔内进行瓶装试验。水分离效率和界面张力（IFT）的最佳结果分别为86-95%和0.7-6.26 mN/m。 IFT 降低结果表明，所研究的离子液体可以成为提高石油采收率的良好候选者。结果发现，增加离子液体的疏水性可以显着提高破乳效率并降低界面张力。在疏水性离子液体中，表明增加烷基链长度可能会改善结果，因此 [C(14)mim][NTf2] 在瓶子测试中显示出最佳结果，并且在 2000 ppm 时 IFT 降低至 0.8 mN/m。通过光学显微镜监测液滴尺寸的变化。
In this work, the application of ionic liquids in separation of water from crude oil as a water demulsifier was reported. Imidazolium ionic liquids substituted with long alkyl chains (n=10, 12 and 14) were synthesized and used as surface-active demulsifiers which were coupled with Cl, PF6 and NTf2 anions. A full factorial design was performed for optimizing the behavior of demulsifiers based on three factors, i.e. alkyl chain length of cation, anion type and IL dosage in three levels. The measurements of interfacial tension between crude oil and water were done for each run and, the bottle test was carried out after demulsification process within the time intervals of 1, 2, 6 and 24 h. The optimal results for water separation efficiency and interfacial tension (IFT) were obtained 86-95% and 0.7-6.26 mN/m, respectively. The IFT reduction results showed that the studied ILs can be good candidates in enhanced oil recovery. It was found that increasing the ionic liquid hydrophobicity could significantly improve the demulsification efficiency along with IFT reduction. In hydrophobic ILs, it was indicated that increasing the alkyl chain length might improve the results, thus [C(14)mim][NTf2] showed the best results in the bottle test as well as IFT reduction to 0.8 mN/m with 2000 ppm. The changes in droplet size were monitored by optical microscopy.