Room Temperature Ionic Liquids for Separating Organics from Produced Water
Room Temperature Ionic Liquids for Separating Organics from Produced Water
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DOI：
10.1081/ss-200052807
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发表时间：
2005-04
影响因子：
2.8
通讯作者：
Joanna McFarlane;W. Ridenour;Huimin Luo;Rodney Dale Hunt;D. DePaoli;R. Ren
中科院分区：
文献类型：
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作者：
Joanna McFarlane;W. Ridenour;Huimin Luo;Rodney Dale Hunt;D. DePaoli;R. Ren
摘要：测量了与石油和天然气生产相关的典型水污染物（有机酸、醇和芳香族化合物）的极性有机化合物在水和九种疏水性室温离子液体之间的分布。本研究中使用的离子液体为1-丁基-3-甲基咪唑鎓双三氟甲磺酰亚胺、1-己基-3-甲基咪唑鎓双三氟甲磺酰亚胺、1-辛基-3-甲基咪唑鎓双三氟甲磺酰亚胺、1-丁基-3-甲基咪唑鎓六氟磷酸盐、三己基十四烷基鏻。双三氟甲磺酰亚胺、1-丁基-1-甲基吡咯烷双三氟甲磺酰亚胺、十二烷基苯磺酸三己基十四烷基鏻、十二烷基苯磺酸三丁基十四烷基鏻和甲磺酸三己基十四烷基鏻。研究了分配系数对盐度、温度、浓度和 pH 值的敏感性。离子液体的分配变化很大。除磺酸盐阴离子离子液体外，乙酸没有显着分配到离子液体相中。己酸在离子液体中的溶解度是显着的，对于所有研究的离子液体都观察到从水溶液中摄取质子化形式。其他有机物也表现出较高的分配系数，甲苯和 1-壬醇高达数百。甲苯、1-壬醇、环己酮和己酸的分配系数在 0.02 至 1.0 范围内与离子液体与水的比率无关。离子液体对某些有机物表现出很大的容量，测得的溶解度高于100 g·L−1。研究了通过冲洗和加热来再生离子液体，并取得了一定的成功。这些实验表明，某些疏水性离子液体确实对水溶液中的有机污染物具有亲和力。然而，用于检测或去除含水废物流中选定的水溶性有机物的离子液体的实际应用似乎受到离子液体在水相中的小但显着的溶解度以及溶剂再生困难的限制。建议开展进一步的工作，以确定溶解目标化合物且无害且在水溶液中溶解度较小的离子液体。
Abstract The distribution of polar organic compounds typical of water contaminants (organic acids, alcohols, and aromatic compounds) associated with oil and gas production was measured between water and nine hydrophobic, room‐temperature ionic liquids. The ionic liquids used in this study were 1‐butyl‐3‐methylimidazolium bistrifluoromethanesulfonylimide, 1‐hexyl‐3‐methylimidazolium bistrifluoromethanesulfonylimide, 1‐octyl‐3‐methylimidazolium bistrifluoromethanesulfonylimide, 1‐butyl‐3‐methylimidazolium hexafluorophosphate, trihexyltetradecylphosphonium bistrifluoromethanesulfonylimide, 1‐butyl‐1‐methyl‐pyrrolidinium bistrifluoromethanesulfonylimide, trihexyltetradecylphosphonium dodecylbenzenesulfonate, tributyltetradecylphosphonium dodecylbenzenesulfonate, and trihexyltetradecylphosphonium methanesulfonate. Sensitivity of the distribution coefficients to salinity, temperature, concentration, and pH was investigated. Partitioning into the ionic liquid varied considerably. Acetic acid did not significantly partition into the ionic liquid phase, except for the sulfonate‐anion ionic liquids. The solubility of hexanoic acid in the ionic liquids was significant, where uptake of the protonated form from aqueous solution was observed for all of the ionic liquids studied. Other organics also showed high distribution coefficients, up to several hundred in the case of toluene and 1‐nonanol. The distribution coefficients for toluene, 1‐nonanol, cyclohexanone, and hexanoic acid were independent of ionic liquid‐to‐water ratio over the range from 0.02 to 1.0. The ionic liquids showed a large capacity for some organics, with solubilities measured above 100 g·L−1. Regeneration of the ionic liquids by rinsing and heating was studied, with mixed success. These experiments show that certain hydrophobic ionic liquids do have an affinity for organic contaminants in aqueous solution. However, practical application of the ionic liquids tested for detection or removal of selected water‐soluble organics from the aqueous waste streams appears to be limited by the small, but significant, solubility of the ionic liquids in the aqueous phase and by difficulty in solvent regeneration. Further work aimed at determination of ionic liquids that dissolve target compounds and are nonhazardous and less soluble in aqueous solutions is recommended.