工业合成氨过程的低浓度NH3与N2、H2、CH4、Ar等复杂混合气体的分离是世界性难题。本项目针对现行工业合成氨普遍采用的物理冷冻法对低浓度NH3难分离及能耗高的技术瓶颈，提出发展新型双功能化深共熔溶剂来实现复杂混合气体中低浓度NH3的高效吸收分离。拟利用乙胺盐酸盐+苯酚类深共熔溶剂的氢键受体和氢键供体均具有弱酸性的特点，同时结合其原料易得、制备简单、粘度较小的特性，通过改变氢健受体和氢健供体的结构和组成，设计合成出对低浓度NH3吸收分离性能优异的低成本、低粘度双功能化深共熔溶剂。同时结合各类先进表征技术、理论计算方法、热力学模型方程推导及拟合等，建立新型双功能化深共熔溶剂的设计合成方法，阐明新型双功能化深共熔溶剂用于NH3吸收分离的调控机制。期望形成以新型双功能化深共熔溶剂为核心的低浓度NH3高效分离新技术，为合成氨过程的低浓度NH3高效吸收分离提供科学基础数据和技术源头。

The separation of low-concentration NH3 from mixed gas containing N2, H2, CH4 and Ar in the industrial ammonia synthesis process is a worldwide problem. The physical freezing method which is widely adopted in the industrial ammonia synthesis process, is associated with some technical bottlenecks such as low separation efficiency and high energy consumption. In view of these, we propose to develop new bifunctional deep eutectic solvents (DESs) to realize the highly efficient absorption of low-concentration NH3 from mixed gas in this project. In the DESs formed by ethylamine chloride (EaCl) and phenol (PhOH), both the hydrogen-bond acceptor and hydrogen-bond donor have weak acidity. Furthermore, both EaCl and PhOH are commercially available, the preparation of EaCl+PhOH DESs is very simple, and the viscosity of EaCl+PhOH DESs is quite low. By utilizing these features, we plan to design and synthesize bifunctional DESs with low cost and viscosity, as well as excellent performance for the absorption of low-concentration NH3. Meanwhile, we also plan to establish the design and synthesis method of bifunctional DESs, and clarify the tuning mechanism of bifunctional DESs for NH3 absorption, by combining the advanced characterization technique, theoretical calculation method, derivation and fitting of thermodynamic model equation. It is expected to form a new technology based on bifunctional DESs for highly efficient separation of low-concentration NH3, and provide scientific basic data and technical source for the highly efficient absorption of low-concentration NH3 in ammonia synthesis process.