Multilayer gas separation composite membrane and preparation method thereof
A technology of gas separation and composite membrane, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. It can solve the problems of pore seepage and hard-to-separate cortex, so as to improve permeation flux, have good industrialization prospects, and suppress pore The effect of seepage
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Embodiment 1
[0047] Prepare Pebax1074 (Pebax1074, model: 1074, French Arkema Company) n-butanol solution, heated and stirred to obtain a uniform transparent solution. After standing for defoaming, the coating liquid was coated on the surface of the polysulfone porous membrane by combining dip coating and wet coating, and the PSF / Pebax1074 composite membrane was obtained after desolventization. The separation performance of the membrane was tested, and the experimental results are listed in Table 1.
[0048] The experimental result of table 1 embodiment 1
[0049]
Embodiment 2
[0051] Prepare Pebax1074 n-butanol solutions with 1% and 3% mass concentrations respectively, and heat and stir to obtain a homogeneous transparent solution. After standing for defoaming, dip coating was used to coat the PDMS surface of composite membrane PSF / PDMS with coating liquid, and PSF / PDMS / Pebax1074 composite membrane was obtained after solvent removal. The separation performance of the membrane was tested, and the experimental results are listed in Table 2.
[0052] The experimental result of table 2 embodiment 2
[0053]
Embodiment 3
[0055] Prepare a Pebax1074 n-butanol solution with a mass concentration of 1%, heat and stir evenly, add different masses of GTA, and continue heating and stirring to obtain Pebax1074-GTA coating solutions with different mass ratio concentrations. After static defoaming, the PDMS surface of the PSF / PDMS composite membrane was coated by dip coating method, and the PSF / PDMS / Pebax1074-GTA multilayer composite membrane was obtained after the solvent was removed. The separation performance of the membrane was tested, and the experimental results are listed in Table 3.
[0056] The experimental result of table 3 embodiment 3
[0057]
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