Priority dealcoholization PDMS/PVDF multi-layer compound film and preparation method thereof
Title：
Priority dealcoholization PDMS/PVDF multi-layer compound film and preparation method thereof
Application Number：
 200710118481
Application Date：
 2007/07/06
Announcement Date：
 2008/03/19
Pub. Date：
Publication Number：
 101143305
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 B01D 69/12, B01D 71/70, B01D 71/34
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Li Jiding, Zhan Xia, Ye Hong, Lin Yangzheng
Key Words：
 Priority dealcoholization, PDMS, PVDF, multi-layer compound film, preparation method
Abstract：
 The invention relates to an ethanol-permselective PDMS/PVDF multilayered composite membrane and the preparation method, which belongs to a pervaporation membrane separation field. The multilayered composite membrane is made based on the following processes: firstly, the PVDF porous basal membrane is prepared by a two-faced wiped film of kynoar polyvinylindene fluoride (PVDF) solution on the polyester non-woven fabric support layer using submersion and sedimentation transformation method; secondly, the membrane liquid, which contains dimethyl silicone polymer (PDMS), cross linking agent and catalyst, is prepared, and the PVDF porous basal membrane is immersed in the membrane liquid for 10s-1min. Each of two sides of the PVDF basal membrane are coated with a layer of silicone base by using immersion and painting method, and then the PVDF basal membrane is dried and cross linked, and so the multilayered composite membrane is made. The existing pure PDMS membrane has bad separability to ethanol aqueous solution, and the highest separation factor is 10.8 ([EtOH] equals to 8wt percent, 30 DGE C). The multilayered symmetrical composite membrane made of the invention has an excellent ethanol-permselective property to low concentration ethanol aqueous solution (5wt percent-30wt percent), and for the ethanol aqueous solution which has a concentration of 5wt percent, the separation factor ¨» value equals to 15, and the permeation flux J equals to 450g/m2h, under the temperature of 60 DGE C.
Claim：
Priority：
PCT：
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2008-4-17
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