Pervaporation membrane and preparation method thereof
A pervaporation membrane and base membrane technology, applied in the field of chemical separation, can solve the problems of small selectivity difference and poor separation effect, and achieve the effect of improving separation performance
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[0030] It can be seen from the background art that the pervaporation membrane used in the prior art for separating methyl ethyl ketone / water mixture has a small difference in selectivity between methyl ethyl ketone and water, resulting in poor separation effect. The inventors of the present invention conduct research on the above-mentioned problem, and provide a kind of preparation method of pervaporation membrane, such as figure 1 As shown, it includes the following steps: S1, mixing the raw materials including porous materials with a pore size of 0.3nm to 0.5nm, polymers, crosslinking agents, catalysts and solvents to form a casting solution; S2, mixing the base membrane with the casting solution The polymers in the method are compounded, and a cross-linked layer dispersed with the above-mentioned porous materials is formed on the surface of the base membrane to obtain a pervaporation membrane.
[0031] In the above preparation method, the raw materials including the porous ...
Embodiment 1
[0045] The porous material used in the preparation of the pervaporation membrane in this example is MIL-53 particles with a particle size of 110nm, the base membrane is a polysulfone material, and a flat ultrafiltration membrane with a membrane area of 28cm 2 , the polymer is hydroxyl-terminated polydimethylsiloxane (OH-PDMS), and the solvent is n-heptane. The preparation method comprises the following steps:
[0046] 1. Place the polysulfone base membrane in 30wt% ethanol / water for 36 hours to remove the organic matter on the surface of the base membrane, then soak in deionized water and filter for 36 hours before use;
[0047] 2. Mix n-heptane, the above polymer, ethyl orthosilicate, and dibutyltin dilaurate in mass ratio polydimethylsiloxane: ethyl orthosilicate: dibutyltin dilaurate=1:0.1:0.005 Prepare a solution, and then uniformly disperse the MIL-53 particles into the solution to form a casting solution, wherein the loading of the MIL-53 particles is 0.5wt% of the pol...
Embodiment 2
[0051] The base membrane used in the preparation of the pervaporation membrane in this example is a polysulfone material, a flat ultrafiltration membrane with a membrane area of 28 cm 2 , the polymer is hydroxyl-terminated polydimethylsiloxane (OH-PDMS), and the solvent is n-heptane. The preparation method comprises the following steps:
[0052] 1. Using water as a solvent, dissolve 0.45g of cobalt nitrate hexahydrate and 5.5g of 2-methylimidazole in 3ml and 20ml of deionized water respectively at room temperature, mix well and stir for 0.8h to obtain a solid-liquid mixture. The liquid mixture was centrifuged to obtain a solid powder, washed three times with water and ethanol respectively, then dried and ground to obtain ZIF-67 particles with a particle size of 110 nm;
[0053] 2. Place the polysulfone base membrane in 30wt% ethanol / water for 36 hours to remove the organic matter on the surface of the base membrane, then soak in deionized water and filter for 36 hours before...
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