Highly-tolerant organic solvent separation membrane and preparation method thereof
An organic solvent and separation membrane technology, applied in the field of high tolerance organic solvent separation membrane and its preparation, can solve the problems of high temperature, PEEK crystal structure damage, difficult application, etc., and achieve strong high temperature resistance, acid and alkali resistance, Effect of good solubility and processability, excellent solvent resistance
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[0029] The present invention provides a method for preparing a highly resistant organic solvent separation membrane, which includes the following steps:
[0030] a) Using the phase inversion method to make the casting liquid into a membrane to obtain an asymmetric membrane; the casting liquid includes a solvent and a polymer containing a Schiff base structure;
[0031] b) placing the asymmetric membrane in an acid solution for acidification to obtain a highly resistant organic solvent separation membrane.
[0032] In the preparation method provided by the present invention, a film casting solution is first provided, and the film casting solution includes a solvent and a polymer containing a Schiff base structure. Wherein, the solvent includes but not limited to one of N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, 1,4-dioxane and tetrahydrofuran or Many kinds. In an embodiment provided by the present invention, the solvent includes N-methylpyrrolidone and tetrah...
Example Embodiment
[0068] Example 1
[0069] Put 1mol of the dihalogen monomer of formula (II) (where R 1 Is phenyl, X is -F), 1mol of the diphenol monomer (R 2 Is phenyl) and 2.01mol anhydrous K 2 CO 3 Add a 2L three-necked flask with mechanical stirring, water separator and condenser, and add 1L N-methylpyrrolidone, then add 300mL toluene, 2 Heat to 140°C with water for 2h under the atmosphere, then distill the water-carrying agent and polymerize at 170°C for 6h, then sink the polymer into water, wash it with deionized water several times, and dry it under vacuum at 100°C for 24h to obtain Polymer of formula (i):
[0070]
[0071] In formula (i), R 1 , R 2 All are phenyl, z=1, n=200.
Example Embodiment
[0072] Example 2
[0073] Put 0.8mol formula (II) structure dihalogen monomer (wherein R 1 Is phenyl, X is -F), 0.2mol of dihalogen monomer of formula (III) (where X is -F), 1mol of diphenol monomer of formula (IV) (R 2 Is phenyl) and 2.01mol anhydrous K 2 CO 3 Add a 2L three-necked flask with mechanical stirring, water separator and condenser, and add 1L N-methylpyrrolidone, then add 300mL toluene, 2 Heat to 140°C with water for 2h under the atmosphere, then distill the water-carrying agent and polymerize at 170°C for 6h, then sink the polymer into water, wash it with deionized water several times, and dry it in vacuum at 100°C for 24h. Formula (i) structure polymer (wherein R 1 , R 2 All are phenyl, z=0.8, n=200).
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