Modified polyamide desalination layer, reverse osmosis membrane and preparation method and application thereof
A technology of reverse osmosis membrane and polyamide, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve the effects of improving tolerance, improving membrane flux, and good oxidation resistance
Active Publication Date: 2020-09-29
WANHUA CHEM GRP CO LTD
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Problems solved by technology
[0006] Although some technical schemes about improving anti-biofouling or / and oxidation resistance of reverse osmosis membranes have been formed in the prior art, these technical schemes still need to improve the anti-biofouling and oxidation resistance of reverse osmosis membranes while improving flux. further improvement
Method used
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Examples
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Embodiment 1～9
[0072] The polysulfone support membrane was prepared by the method in Comparative Examples 1-3.
[0073] The aromatic polyamide desalination layer was prepared by the following steps:
[0074] (1) First prepare 500 g of aqueous solution containing m-phenylenediamine, then add (2-aminobenzyl) triphenylphosphine bromide and 5-amino-6-hydroxyl-flavone (additive) in the solution, stir at room temperature to make It dissolves completely, obtains the aqueous phase A solution containing (2-aminobenzyl) triphenylphosphine bromide and 5-amino-6-hydroxyl-flavone (wherein, embodiment 9 does not add (2-aminobenzyl ) triphenylphosphine bromide).
[0075] (2) Immerse the polysulfone porous support layer into the water phase A solution, remove the excess water phase on the surface, and then contact with 25 g of the trimesoyl chloride organic phase B solution to obtain a reverse osmosis membrane.
[0076]In Examples 1-9, the concentration and contact time of each substance in the aqueous ph...
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Abstract
The invention relates to a modified polyamide desalination layer, a reverse osmosis membrane and a preparation method and application thereof. Modified substances of the modified polyamide desalination layer comprise monoamino hydroxyl flavone. Monoamino hydroxyl flavone is used for modifying the polyamide desalination layer, and due to the addition of the monoamino hydroxyl flavone, the reverse osmosis membrane is endowed with good oxidation resistance, and the effect of improving the membrane flux is achieved. (2-aminobenzene methyl) triphenylphosphonium bromide is added in a preferred scheme so that the reverse osmosis membrane with biological pollution resistance, oxidation resistance and high flux can be obtained, and when the reverse osmosis membrane is applied to water treatment, the treatment efficiency can be further improved, and the production cost can be reduced.
Description
technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified polyamide desalination layer, a reverse osmosis membrane and a preparation method and application thereof. Background technique [0002] Reverse osmosis membranes have been widely used in household water purifiers, industrial pure water manufacturing, wastewater treatment, and seawater desalination because of their high separation efficiency, low energy consumption, and less pollution. At present, the mainstream reverse osmosis membrane on the market is a cross-linked aromatic polyamide composite reverse osmosis membrane, which uses m-phenylenediamine and trimesoyl chloride to perform interfacial polycondensation reaction on the surface of polysulfone support membrane to form a polyamide desalination layer. After decades of technical improvements, the performance of reverse osmosis membranes has been significantly improved. [0003] However, in actual use, rev...
Claims
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IPC IPC(8): B01D71/68B01D69/02B01D69/10B01D67/00B01D61/02C02F1/44
CPCB01D71/68B01D69/02B01D69/10B01D67/0002B01D61/025C02F1/441B01D2325/28B01D2325/30Y02A20/131
Inventor 苏蕾孙家宽赵伟国
Owner WANHUA CHEM GRP CO LTD