咪唑基二阳离子离子液体通过形成深共晶溶剂高效分离油混合物中的酚类化合物,Energy & Fuels

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咪唑基二阳离子离子液体通过形成深共晶溶剂高效分离油混合物中的酚类化合物
Energy & Fuels ( IF 5.2 ) Pub Date : 2017-08-14 00:00:00 , DOI: 10.1021/acs.energyfuels.7b01793
Youan Ji ₁ , Yucui Hou ₂ , Shuhang Ren ₁ , Congfei Yao ₁ , Weize Wu ₁

Affiliation

从油混合物中分离酚类化合物是进一步精制或应用油混合物的重要步骤。在这项工作中，三种基于咪唑鎓的离子型离子液体（DILs; 1,2-双[ N-（N'-甲基咪唑鎓）]乙烷二溴化物DIL1; 1,3-双[ N-（N-（N'-甲基咪唑鎓））]丙烷二溴化物DIL2；和1,4-双[ N-（N合成了''-甲基咪唑鎓）]二溴化丁烷DIL3），并用于从油混合物中分离酚类化合物。详细研究了时间，温度，DIL：苯酚摩尔比和初始苯酚浓度对分离性能的影响。发现苯酚的去除效率遵循DIL1 ＜DIL2 ＜DIL3的顺序。DIL3的最大去除苯酚效率为96.6％，最小最终苯酚浓度为3.9 g / dm ³。初始苯酚浓度对最终苯酚浓度影响很小。为了获得最高的苯酚去除效率，需要DIL：苯酚摩尔比小于0.4，分离过程可在5分钟内完成。这些DIL可以重复使用而不会降低苯酚的去除效率，并且DIL的性能在四个循环后没有变化。同样，DIL3被证明可以从真正的煤焦油中分离出酚类化合物，去除率为93.1％。重要的是，这些DIL在油混合物中的溶解度比单阳离子ILs小得多。此外，这些DIL比单阳离子IL具有更高的热稳定性，从而提供了比以往更大的工作温度范围。

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Highly Efficient Separation of Phenolic Compounds from Oil Mixtures by Imidazolium-Based Dicationic Ionic Liquids via Forming Deep Eutectic Solvents

The separation of phenolic compounds from oil mixtures is an important step for further refining or applications of the oil mixtures. In this work, three imidazolium-based dicationic ionic liquids (DILs; 1,2-bis[N-(N′-methylimidazolium)]ethane dibromide, DIL1; 1,3-bis[N-(N′-methylimidazolium)]propane dibromide, DIL2; and 1,4-bis[N-(N′-methylimidazolium)]butane dibromide, DIL3) were synthesized and used to separate phenolic compounds from oil mixtures. The effects of time, temperature, DIL:phenol mole ratio, and initial phenol concentration on separation performance were investigated in detail. It was found that the removal efficiency of phenol followed the order DIL1 < DIL2 < DIL3. DIL3 showed the maximum phenol removal efficiency of 96.6% and the minimum ultimate phenol concentration of 3.9 g/dm³. Initial phenol concentration had little influence on the ultimate phenol concentration. Less than 0.4 in DIL:phenol mole ratio was needed to obtain the highest phenol removal efficiency, and the separation process could be completed within 5 min. These DILs could be reused without a decrease in the removal efficiency of phenol, and the properties of DILs did not change after four cycles. Also, DIL3 was demonstrated to separate phenolic compounds from real coal tar oil with the removal efficiency of 93.1%. Importantly, these DILs showed much smaller solubilities in oil mixtures than monocationic ILs. In addition, these DILs showed higher thermal stabilities than monocationic ILs, which provides a broader range of operation temperature than ever.

更新日期：2017-08-14

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