A kind of preparation method of high-efficiency gas separation membrane
A gas separation membrane, high-efficiency technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as low gas permeability coefficient, achieve high separation factor, low preparation cost, and good reproducibility
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Embodiment 1
[0023] Add 0.1% polyvinyl alcohol to a mixed solution containing 1% glutaraldehyde and 0.5% 0.3nm zeolite molecular sieve, mix well, and then apply it to the reverse osmosis basement membrane. After 20 seconds, pour off the excess solution and dry it in the shade. , coating an aqueous solution containing 0.1% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 2200Lm2h / Mpa, the gas permeability of N2 is 4Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reached 550.
Embodiment 2
[0025] Add 0.2% polyvinyl alcohol to the mixed solution containing 3% glutaraldehyde and 0.8% 0.3nm zeolite molecular sieve, mix well, and apply it on the reverse osmosis basement membrane, pour off the excess solution after 20s, and dry in the shade , coating an aqueous solution containing 0.3% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 1800Lm2h / Mpa, the gas permeability of N2 is 1Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reaches 1800.
Embodiment 3
[0027] Add 0.3% polyvinyl alcohol to the mixed solution containing 3% glutaraldehyde and 0.8% 0.3nm zeolite molecular sieve, mix well, and apply it on the reverse osmosis basement membrane. After 20s, pour off the excess solution and dry it in the shade. , coating an aqueous solution containing 0.3% polyethyleneimine on the shade-dried film, after 30s, pour off the excess solution, and treat it in an oven at 70°C for 20min. During the gas separation test at 0.3 MPa, the gas separation membrane prepared by this method, CO 2 The gas permeability of the gas is 1200Lm2h / Mpa, the gas permeability of N2 is 1Lm2h / Mpa, and the separation of N2 and CO 2 The separation factor reaches 1200.
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