Method for preparing fluorinated polyimide film for separating arene/alkane through permeating and steaming |
Title： |
| Method for preparing fluorinated polyimide film for separating arene/alkane through permeating and steaming |
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Application Number： |
200710117733 |
Application Date： |
2007/06/22 |
Announcement Date： |
2008/01/30 |
Pub. Date： |
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Publication Number： |
101112677 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
B01D 71/46B01D 53/22 |
Applicant(s)： |
Tsinghua University |
Inventor(s)： |
Li Jiding, Ye Hong, Chen Jian, Lin Yangzheng |
Key Words： |
preparing method, fluorinated polyimide film, arene, alkane, permeate, steam |
Abstract： |
A fluorine-containing polyimide membrane preparation method for separation of infiltration vaporization aromatic hydrocarbon/alkane belongs to the infiltration vaporization aromatic membrane separation technical field. The prior polyimide membrane must carry out the crosslinking to restrict the swelling, with complex disposal process. The invention includes 1) synthesis of the fluorine-containing polyimide: the diamine monomer is added to the solvent on the condition of nitrogen and mixing and is then fully dissolved; after that, the dianhydride monomer 6FDA is added to carry out the polycondensation for 12 through 18 hours; after that, the acetic anhydrite and the triethylamine are added for the imidization reaction, and the final outcome is deposited in the water, which is dried for reserve; 2) preparation of the casting solution is as following: the uniform casting solution is dissolved in the solvent, filtrated and defoamed; 3) membrane scraping: the membrane is formed by flow casting on the glass plate. The fluorine-containing polyimide uniform membrane can be obtained after the solvent is volatile after 2 through 3 hours and dipped in the water for 1 through 2 hours. The invention has the advantages of simple process, good heat and chemical stability, mechanical performance of the selected material, and good separation effect. |
Claim： |
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