Sulfonated polyamide composite reverse osmosis membrane for desalination of brackish water and preparation method thereof
A technology of sulfonated diamine monomers and compounds, which is applied in the field of composite RO membrane preparation, can solve the problems of not particularly high flux and energy consumption, and achieve the effects of excellent durability, cheap raw materials, and easy availability of raw materials
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Embodiment 13
[0042] Example 13,3'-(ethane-1,2-bis(azanyl))bis(2,6-dimethylbenzenesulfonic acid), 3,3'-(ethane-1,2-diylbis( The synthesis of azanediyl))bis(2,6-dimethylbenzenesulfonic acid), 3,3'-EDADMBSA(M1), whose structural formula is:
[0043]
[0044] (1) Synthesis of A
[0045] Put 5.0g of 2,6-dimethylaniline and 250mL of methanol into a 500mL round-bottomed flask, slowly add 1.20g of glyoxal solution, fix it on an iron stand, stir at room temperature, obtain a white precipitate after 8h, filter it with After washing with methanol, 5.54 g of white solid A was obtained (the yield was about 89.5%).
[0046] (2) Synthesis of B
[0047] Put 10.0g of A in a 100mL round-bottomed flask, add 200mL of methanol, then slowly add 0.71g of sodium borohydride, install a reflux condenser at the mouth of the bottle, place it in an oil bath at 60°C, stir and reflux, and obtain a viscous solution after 12 hours. Add water after suspension steaming, add water to adjust the pH to 3-7, and suction f...
Embodiment 23
[0055] Example 23, 3'-(Ethane-1,2-(diaza group))bis(2,6-diisopropylbenzenesulfonic acid), 3,3'-(ethane-1,2-diylbis (azanediyl))bis (2,6-diisopropylbenzenesulfonic acid) EDADIPBSA (M2) synthesis, its structural formula is:
[0056]
[0057] (1) Synthesis of A
[0058] Put 5.0g of 2,3,5,6-tetramethylaniline and 250mL of methanol into a 500mL round bottom flask, slowly add 0.82g of glyoxal solution, fix it on an iron stand, stir at room temperature, and obtain a white precipitate after 8h, After suction filtration and washing with methanol, 5.32 g of white solid A was obtained (the yield was about 91.5%).
[0059] (2) Synthesis of B
[0060] Put 10.0g of A in a 100mL round-bottomed flask, add 200mL of methanol, then slowly add 4.03g of sodium borohydride, install a reflux condenser at the mouth of the bottle, place it in an oil bath at 90°C, stir and reflux, and obtain a viscous solution after 12 hours. Add water after suspension steaming, add water to adjust the pH to 3-7,...
Embodiment 33
[0068] Example 33,3'-(ethane-1,2-(diaza group))bis(2,6-diethylbenzenesulfonic acid), 3,3'-(ethane-1,2-diylbis( The synthesis of azanediyl))bis(2,6-diethylbenzenesulfonic acid)EDADEBSA(M3), its structural formula is:
[0069]
[0070] (1) Synthesis of A
[0071] Put 5.0g of 2,6-dimethylaniline and 250mL of methanol into a 500mL round-bottomed flask, slowly add 0.97g of glyoxal solution, fix it on an iron stand, stir at room temperature, obtain a white precipitate after 8h, filter it with After washing with methanol, 5.75 g of white solid A was obtained (the yield was about 96.4%).
[0072] (2) Synthesis of B
[0073] Put 10.0g of A in a 100mL round bottom flask, add 200mL of methanol, then slowly add 12.95g of sodium borohydride, install a reflux condenser at the mouth of the bottle, place it in an ice bath and stir, and after 24 hours, a viscous liquid is obtained, and after suspension steaming, add water, Water was added to adjust the pH to 3-7, and the powder was preci...
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