Nano-filtration membrane for separating organic compounds and salts, and preparation method thereof
A technology of nanofiltration membrane and organic matter, which is applied in the field of nanofiltration membrane for separating organic matter and salt and its preparation, can solve the problems of poor pollution resistance, low separation efficiency, etc. Effect
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[0015] The steps of the preparation method of the nanofiltration membrane for separating organic matter and salt are as follows:
[0016] 1) Add 3 to 6 parts by mass of monomers containing zwitterionic groups and 1 part by mass of hydroxyalkyl acrylate monomers into water to prepare an aqueous solution with a mass percent concentration of 10 to 30wt%, blow nitrogen into it, and add mass A water-soluble oxidation-reduction initiator with a percentage concentration of 1 to 3 wt%, at 30 to 45 o Solution polymerization is carried out at C, the polymerization time is 1 to 5 hours, and after several times of centrifugation and water washing, a binary copolymer containing zwitterions is obtained, which is vacuum-dried and used for later use;
[0017] 2) Add 1 to 2.5 parts by mass of the above-mentioned binary copolymer containing zwitterions and 0.1 to 0.45 parts by mass of polyaldehyde to disperse in water, then add inorganic acid to adjust the pH value of the solution to 1.8 to 3.8...
Embodiment 1
[0022] 6 parts by mass of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt and 1 part by mass The hydroxyethyl acrylate monomer is added into water to prepare an aqueous solution with a mass percentage concentration of 10wt%, and nitrogen gas is passed through, and an oxidation-reduction initiator K with a mass percentage concentration of 1% is added 2 S 2 o 8 and NaHSO 3 (1:1), at 45 o Solution polymerization is carried out under C, and the polymerization time is 1 hour. After several times of centrifugation and water washing, a binary copolymer containing zwitterions is obtained, which is dried in vacuo for subsequent use; 1 mass part of binary copolymers containing zwitterions and 0.1 The glutaraldehyde of mass part adds water and disperses, then adds sulfuric acid and adjusts solution pH value to be 1.8, at 20 o Stir at a temperature of C for 20 minutes to obtain a milky white dispersion; o Under the temperature of C and...
Embodiment 2
[0024] 3 parts by mass of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt and 1 part by mass The hydroxyethyl acrylate monomer is added into water to form an aqueous solution with a mass percentage concentration of 30wt%, and nitrogen gas is passed through, and an oxidation-reduction initiator K with a mass percentage concentration of 3% is added 2 S 2 o 8 and NaHSO 3 (1:1), at 30o Solution polymerization was carried out under C, and the polymerization time was 5 hours. After several times of centrifugation and water washing, a binary copolymer containing zwitterions was obtained, which was dried in vacuo for subsequent use; 2.5 parts by mass of binary copolymers containing zwitterions and 0.45 The glutaraldehyde of mass part adds water to disperse, then adds sulfuric acid and adjusts solution pH value to be 3.8, at 30 o Stir at a temperature of C for 40 minutes to obtain a milky white dispersion; o Under the temperature of ...
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