新型酚基深共熔溶剂的物性表征及NH3捕集性能研究

NH₃污染问题一直是化工、环保等领域关注的重点问题，对工业尾气中的NH₃进行捕集和回收具有十分重要的意义。以氯化1-乙基-3-甲基咪唑 （［Emim］Cl） 为氢键受体，苯酚、间苯二酚和间苯三酚为氢键供体，构建了一类新型酚基深共熔溶剂。详细测定了酚基深共熔溶剂在不同温度下的密度和黏度，并采用经验方程对密度和黏度数据进行了关联。此外，系统考察了酚基深共熔溶剂对NH₃的吸收-解吸性能和吸收选择性，发现其具有较高的NH₃吸收容量，被吸收的NH₃可在加热和减压的条件下释放出来，经过多次循环NH₃吸收容量基本保持不变。而酚基深共熔溶剂的CO₂吸收容量则较低，因而具有优异的NH₃/CO₂吸收选择性。最后，借助光谱表征和量子化学计算，深入探究了NH₃在酚基深共熔溶剂中吸收的相互作用机制。

Physical properties characterizations and NH3 capture performance investigation of novel phenol-based deep eutectic solvents

NH₃ pollution has always been a key concern in chemical industry, environmental protection and other fields. The capture and recovery of NH₃ in industrial exhaust gas is of great significance. A novel class of phenol-based deep eutectic solvents (DESs) were constructed by using 1-ethyl-3-methylimidazolium chloride (Emim]Cl) as the hydrogen bond acceptor, while phenol (Phe), resorcinol (Res) and phloroglucinol (Phl) as the hydrogen bond donors. The densities and viscosities of phenol-based DESs at different temperatures were determined in detail, and the density and viscosity data were correlated by empirical equations. In addition, the NH₃ absorption-desorption performance and absorption selectivity of phenol-based DESs were systematically investigated. It is found that the capacities of phenol-based DESs for NH₃ absorption are quite high, and the absorbed NH₃ can be released by heating and evacuating, with the capacities for NH₃ absorption remaining almost unchanged after several cycles. However, the capacities of phenol-based DESs for CO₂ absorption are quite low, indicating the excellent performance of phenol-based DESs for NH₃/CO₂ selective absorption. Finally, the interaction mechanism of NH₃ absorption in phenol-based DESs was studied in depth with the help of spectral characterizations and quantum chemistry calculations.