蒸馏作为应用最为广泛的分离技术，存在着能耗高、热力学效率低等问题。纳米流体因传热传质性能优异，在强化传热、吸收和萃取等方面研究广泛，但在蒸馏领域目前缺乏系统的研究，且相关强化机理尚不明确。本项目拟采用理论和实验相结合的方法对纳米流体强化蒸馏过程的传质机理进行深入研究。运用分子模拟获得纳米流体的物性和微观结构特征，从微观尺度建立纳米流体微观结构与宏观性质之间的关系；基于格子Boltzmann方法对汽液界面Rayleigh对流和Marangoni对流进行模拟研究，从介观尺度揭示纳米颗粒对界面对流的影响规律；通过汽液相平衡实验，探究纳米颗粒对二元体系相对挥发度的影响，并采用纹影仪观察汽液传质装置中纳米流体界面对流结构，以验证模拟结果的准确性。本项目的开展可为蒸馏过程节能降耗提供新思路，为纳米流体在蒸馏领域的应用提供理论指导。

As the most widely used separation technology, distillation has the disadvantages of high energy consumption and low thermodynamic efficiency. Since nanofluids can enhance the heat and mass transfer performance, they are generally studied in the fields of heat transfer, absorption and extraction. However, there is a lack of systematic research in the field of distillation, and the relevant strengthening mechanism is not yet clear. This project intends to use a combination of theoretical and experimental methods to study the mass transfer mechanism of distillation enhanced by nanofluids. Molecular simulation is used to obtain the properties and microstructure characteristics of nanofluids, and the relationship between the microstructure and macroscopic properties of nanofluids is established from the microscopic scale. The lattice Boltzmann method is used for the simulation and research of interfacial Rayleigh convection and Marangoni convection in vapor-liquid mass transfer process, which reveals the effects of nanoparticles on the interfacial convection from the mesoscopic scale. To verify the accuracy of the simulation, the effects of nanoparticles on the relative volatility of binary systems are investigated by vapor-liquid phase equilibrium experiment, and the Schlieren is also used to observe the interfacial convectional structure in vapor-liquid mass transfer device. The implementation of this project will provide a new idea for energy saving in distillation process and lay a theoretical foundation for the application of nanofluids for distillation.