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Novel high-performance forward-penetration film and preparation method thereof

A forward osmosis membrane, high-performance technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve internal concentration polarization, do not have high water flux and low Salt backdiffusion flux and other issues

Inactive Publication Date: 2017-11-21
MINNAN NORMAL UNIV
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Problems solved by technology

[0005] In the prior art, forward osmosis composite membranes are often used to reduce the diffusion resistance of the permeate to increase the flux of the membrane. Due to the existence of a porous support layer, the problem of internal concentration polarization is easily generated in the pores of the support layer during the separation process; and now Composite membranes with forward osmosis do not have high water flux and low salt reverse diffusion flux

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  • Novel high-performance forward-penetration film and preparation method thereof
  • Novel high-performance forward-penetration film and preparation method thereof

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preparation example Construction

[0045] In the preparation method of the novel high-performance forward osmosis membrane provided by the embodiment of the present invention, it specifically includes:

[0046] Preparation of casting solution: take a certain amount and a certain molecular weight of phenolphthalein side group polyarylether ketone, anhydrous Na 2 SO 4 and concentrated H 2 SO 4 , Stir the reaction at a certain temperature for 6-12 hours. After the reaction, the reaction solution was cooled to room temperature, the product was precipitated with distilled water, and then the precipitate was washed with a large amount of deionization until the pH value was close to 7, and then placed in an electric constant temperature blast drying oven for drying. After mixing and dissolving a certain amount of sulfonated product, polyvinylpyrrolidone, acetone, N,N-dimethylformamide, dimethyl sulfoxide and N-methylpyrrolidone, a casting solution is obtained.

[0047] Pretreatment of the support layer: use a cert...

Embodiment 1

[0066] Stir 80wt% of N,N-dimethylpyrrolidone, 18wt% of SPEK-C and 2wt% of polyvinylpyrrolidone K-30 until completely dissolved, and let stand until defoaming is complete. Dip-coat the casting solution on nylon cloth soaked with N,N-dimethylpyrrolidone, dry at 50°C for 2 hours, dry and cool, then soak the film in deionized water for 24 hours at a constant temperature, and change the water during the period 2 times to ensure that the porogen is removed and the membrane required for the experiment is obtained.

[0067] Using 2mol / L NaCl solution as the driving solution, deionized water as the raw material solution, and the fluid flow rate on both sides of the membrane at 0.25L / min, the separation performance of the prepared forward osmosis composite membrane was tested, and the water flux was 120.65L. m -2 h -1 ; Salt back diffusion flux is 22.28g m -2 h.

Embodiment 2

[0069] 84wt% of N,N-dimethylformamide, 12wt% of SPEK-C and 4wt% of acetone were stirred until completely dissolved, and allowed to stand until defoaming was complete. Dip-coat the casting solution on nylon cloth soaked with N,N-dimethylformamide, dry at 70°C for 3 hours, dry and cool, then soak the film in deionized water for 36 hours at a constant temperature, and replace it during the period. Water was added 4 times to ensure that the porogen was removed to obtain the membrane required for the experiment.

[0070] Using 2mol / L NaCl solution as the driving solution, deionized water as the raw material solution, and the fluid flow rate on both sides of the membrane at 0.25L / min, the separation performance of the prepared forward osmosis composite membrane was tested, and the water flux was 113.65L. m -2 h -1 ; Salt back diffusion flux is 28.31g m -2 h.

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Abstract

The invention belongs to the technical field of functional separation films and discloses a novel high-performance forward-penetration film and a preparation method thereof; a certain amount of nylon cloth is pretreated with a solvent; phenolphthalein-side-chain polyaryletherketone is sulfonated; the sulfonated phenolphthalein-side-chain polyaryletherketone and an additive are prepared into a casting film liquid with certain concentration; the casting film liquid is applied to the surface of nylon cloth under coating thickness control to obtain a primary novel high-performance positive-penetration film; the primary novel high-performance positive-penetration film is dried at certain temperature to obtain the novel high-performance forward-penetration film. An intermediate layer of the novel high-performance forward-penetration film is a nylon cloth porous support layer; by applying the sulfonated phenolphthalein-side-chain polyaryletherketone functional surface layers, the problem of inner concentration difference polarization easily caused in the separation process by the positive-penetration composite film; in the preparation of the casting film liquid, a pore-forming agent is added to adjust pore features of the film, so that the prepared positive-penetration composite film has high water flux and low-salinity back-diffusion flux.

Description

technical field [0001] The invention belongs to the technical field of functional separation membranes, in particular to a novel high-performance forward osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis technology is rapidly replacing conventional water treatment technology due to its good product water quality. However, reverse osmosis water treatment relies on high pressure as the driving force, which easily leads to problems of high energy consumption and serious membrane fouling. Therefore, a new generation of low energy consumption, low pollution, and sustainable water purification technology—forward osmosis membrane separation technology is expected to become a strong competitor of reverse osmosis. The forward osmosis process only relies on the natural osmotic pressure between the two phases, which is a spontaneous process, so it has energy-saving and environmental protection effects; the forward osmosis process does not...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00C02F1/44
CPCB01D61/002B01D67/0002C02F1/445
Inventor 陈建华朱兴何亚三许静萍
Owner MINNAN NORMAL UNIV
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