The application discloses a
fluorine-containing anion adsorption site modified non-interface
polyimide-based
acetylene separation membrane and a preparation method and application thereof, and comprises a
polymer continuous phase and a
fluorine-containing anion salt uniformly dispersed in the
polymer continuous phase; wherein the
polymer continuous phase is a
polyimide matrix containing 6FDA structural units, the
fluorine-containing anion in the fluorine-containing anion salt is
tetrafluoroborate and / or
hexafluorophosphate, and the fluorine-containing anion in the fluorine-containing anion salt cooperates with a fluorine-containing structure in the
polyimide matrix to construct an
acetylene adsorption microenvironment in the polymer continuous phase as an
acetylene adsorption site. Unlike a traditional
mixed matrix membrane, the application does not depend on porous fillers such as
metal organic frameworks, molecular sieves or covalent organic frameworks, and can effectively solve the non-selectivity defects caused by particle agglomeration and interface voids of the
mixed matrix membrane. Moreover, the preparation method is simple, raw materials are easy to obtain, and the application can be used for efficient separation of acetylene-containing
mixed gas.