In this article, dicationic ionic liquids (DILs), including N,N,N,N′,N′,N′-hexaethyl-ethane-1,2-diammonium dibromide (HEDBr), N,N,N,N′,N′,N′-hexaethyl-propane-1,3-diammonium dibromide (HPDBr) and N,N,N,N′,N′,N′-hexaethyl-butane-1,4-diammonium dibromide (HBDBr), were designed and used to extract phenolic compounds from model oil and coal tar oil. The effects of stirring time, temperature, DIL:phenol mole ratio, and initial phenol concentration on the extraction of phenol were studied. It is found that the DIL:phenol mole ratio is only around 0.3 when the highest extraction efficiency of phenol is obtained. The extraction process completes within 5 min at room temperature, and the extraction efficiency is not dependent on temperature. Also, the ultimate phenol concentration remains constant despite the difference in initial phenol concentrations. Of these DILs, HPDBr shows the lowest ultimate phenol concentration of 3.9 g/dm³, and the extraction efficiency of phenol can reach as high as 97.0%. These DILs can be regenerated by anti-solvent method and reused several times without significant reduction in extraction efficiency. In addition, HPDBr was demonstrated to extract phenolic compounds from real coal tar oil, and its extraction efficiency of phenolic compounds is 92.7%. The mechanism, analyzed by FT-IR, shows that there is a hydrogen bond between phenol and DIL.

在本文中，离子性离子液体（DIL）包括N，N，N，N '，N '，N ' ，N'-六乙基乙烷-1，2-二溴化二铵（HEDBr），N，N，N，N '，N '，N'-六乙基丙烷-1,3-二溴化二铵（HPDBr）和N，N，N，N '，N '，N设计了'-六乙基丁烷-1,4-二溴化二铵（HBDBr），并用于从模型油和煤焦油中提取酚类化合物。研究了搅拌时间，温度，DIL：苯酚摩尔比和初始苯酚浓度对苯酚提取的影响。发现当获得最高的苯酚提取效率时，DIL∶苯酚的摩尔比仅为约0.3。萃取过程在室温下5分钟内完成，并且萃取效率与温度无关。而且，尽管初始苯酚浓度不同，但最终苯酚浓度仍保持恒定。在这些DIL中，HPDBr的终极苯酚浓度最低，为3.9 g / dm ³，苯酚的提取效率可高达97.0％。这些DIL可以通过反溶剂方法再生并重复使用几次，而不会显着降低萃取效率。此外，HPDBr被证明可以从真正的煤焦油中提取酚类化合物，其对酚类化合物的提取效率为92.7％。通过FT-IR分析该机理表明，苯酚和DIL之间存在氢键。