用双层MOFs纳米片提升天然气脱水膜选择性的研究

随着功能膜技术的发展，海洋天然气资源开发的规模不断扩大，但因聚合物膜在分离过程中结构稳定性差，严重制约了天然气资源开发的速度。本项目拟通过MOFs纳米片组成和结构的调控，设计不同水蒸气含量响应型MOFs纳米片，并揭示其构效关系。探究所设计的MOFs纳米片与聚合物的相互作用形式，并以此构筑天然气体系中水蒸气含量梯度响应型高选择性双层MOFs纳米片混合基质膜。研究膜中MOFs纳米片对高分子链运动的影响规律，以期提高功能膜的稳定性；探究该膜结构与甲烷分离选择性的构效关系，创建复合膜高效分离界面构筑理论；通过其分离的动力学过程研究探明其分离机制。其项目的成功，势必会为高性能天然气脱水膜材料开发提供理论基础和数据支撑，推动海洋天然气资源开发领域的发展。

Development of functional membrane technology has accelerated the exploitation of marine natural gas resources. However, due to the poor structural stability of polymer membrane in the separation process, the development of natural gas resources is seriously restricted. This project intends to design water vapor content-responsive MOFs nanosheets through the regulation of their composition and structure, and then reveal the structure-property relationship. The project explores the interaction between MOFs nanosheets and the polymer substrate, and then constructs a highly selective mixed matrix membrane containing bilayer MOFs nanosheets with a gradient response of water vapor content in natural gas system. The influence of MOFs nanosheets on polymer chain movement is studied to improve the stability, and the structure-property relationship between the membrane structure and methane separation selectivity is explored to create the high-efficiency separation theory based on the interface construction, and explores its separation mechanism through the study of the dynamic process. The success of this project is bound to provide theoretical basis and data support for the development of high-performance natural gas dehydration membrane materials, as well as promote the development of marine natural gas resources development.