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Preparation method of polyester fiber braided tube enhanced type composite hollow fiber forward osmotic membrane

A forward osmosis membrane and polyester fiber technology, applied in the field of membrane preparation, can solve the problems of easy deformation of the activated separation layer, low strength of the fiber membrane, complicated membrane production process, etc., and achieve easy large-scale industrial production, simple membrane production process, The effect of improving hydrophilicity

Active Publication Date: 2017-05-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low strength, easy pollution and short service life of the existing forward osmosis hollow fiber membrane, unstable membrane performance caused by easy deformation and shedding of the activated separation layer of the internally supported hollow fiber membrane, and complicated membrane manufacturing process, etc. A polyester fiber braided tube reinforced composite hollow fiber forward osmosis membrane and its preparation method are proposed

Method used

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preparation example Construction

[0024] The preparation method of the polyester fiber braided tube reinforced composite hollow fiber forward osmosis membrane of the present invention comprises:

[0025] 1) Preparation of casting solution: firstly add an inorganic additive (one or more mixtures of carbon nanotubes, sulfonated titanium dioxide, nano silicon dioxide or zinc chloride) with a mass ratio of 1-3% to the organic 69-83% organic solvent (one of dimethylacetamide DMAc, dimethylformamide DMF, dimethylsulfoxide DMSO, nitrogen methylpyrrolidone NMP, 1,4-dioxane or acetone or The mixture of the above-mentioned several solvents) to obtain an organic solution, after ultrasonic dispersion for 30min-2h, 14-20% of the polymer (cellulose acetate CA, triacetate CTA, polyacrylonitrile PAN or polybenzimidazole PBI in One or more of the mixture), 2-8% organic additives (one or more of polyvinylpyrrolidone PVP, polyvinyl alcohol PVA, polyethylene glycol PEG, triethylene glycol TEG or glycerol mixture) was added to th...

Embodiment 1

[0035] Add 14% cellulose acetate CA and 6% polyvinylpyrrolidone to a mixed solvent of 1% carbon nanotubes mixed with 45% acetone + 34% 1,4-dioxane, which is ultrasonically dispersed for 30 minutes, at 60°C Stir and dissolve for 12 hours, and vacuum defoam at 40°C for 12 hours to obtain a homogeneous casting solution.

[0036] The casting solution is squeezed into the circular spinneret through the gear pump under the pressure of 0.1Mpa nitrogen, and evenly coated on the outer wall of the braided tube and the inner channel. Phase inversion was carried out in deionized water to form a membrane. The selected braided tube is a braided tube obtained by blending FDY and DTY polyester PET fibers, with an outer diameter of 1.8 mm and an inner diameter of 1.2 mm.

[0037] Soak the obtained membrane filaments in deionized water for 24 hours to remove the remaining organic solvent in the membrane, then soak the membrane filaments in a hot water bath at 60°C for 0.5 hours, and finally so...

Embodiment 2

[0040] Add 7% cellulose acetate CA + 7% triacetate cellulose CTA, 2% polyvinyl alcohol PVA, add 1% sulfonated titanium dioxide and mix it in 83% 1,4-dioxane for 60 minutes by ultrasonic dispersion, at 40 Stir and dissolve at ℃ for 16 hours, and vacuum defoam at 60℃ for 10 hours to obtain a homogeneous casting solution.

[0041] The casting solution is squeezed into the circular spinneret through the gear pump under the nitrogen pressure of 0.2Mpa, and evenly coated on the outer wall of the braided tube and the inner channel. The phase inversion was carried out in 25% dimethylacetamide DMAc aqueous solution to form a film. The selected braided tube is a braided tube obtained by PET / PBT fiber blending, with an outer diameter of 1.0 mm and an inner diameter of 0.5 mm.

[0042] Soak the obtained membrane filaments in deionized water for 24 hours to remove the remaining organic solvent in the membrane, then put the membrane filaments into a hot water bath at 80°C for 1 hour, and f...

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Abstract

The invention discloses a preparation method of a polyester fiber braided tube enhanced type composite hollow fiber forward osmotic membrane. The preparation method comprises the following steps of confecting a polymer, an organic additive, an inorganic additive and an organic solvent to be homogeneous membrane casting liquid according to a proportion; uniformly coating the membrane casting liquid on the outer wall and an internal pore canal of a polyester fiber braided tube, so as to obtain a braided tube of which the inner wall and the outer wall are coated with membranes; making the membrane coated braided tube pass a certain air residence time and then enter a coagulation bath to carry out phase-inversion membrane formation; soaking a primarily formed membrane in deionized water to remove the residual organic solvent, soaking the primarily formed membrane in a hot water bath, finally, soaking the primarily formed membrane in a glycerol aqueous solution, and then taking out and airing the primarily formed membrane, so that the polyester fiber braided tube enhanced type composite hollow fiber forward osmotic membrane is made. According to the preparation method, polymer membrane casting liquid is coated on the inner wall and the outer wall of the braided tube in a one-step manner by adopting an immersion precipitation phase inversion method to obtain a high-strength composite hollow fiber forward osmotic membrane; the film making process is simple; the water flux, the selectivity, the hydrophilism, the performance stability and the service life of a membrane are improved by an organic and inorganic blending membrane making method.

Description

technical field [0001] The invention belongs to the field of membrane preparation, and in particular relates to a polyester fiber braided tube reinforced composite hollow fiber forward osmosis membrane and a preparation method thereof. Background technique [0002] Membrane separation technology has developed rapidly in recent years and is widely used in the fields of water purification, sewage treatment and reuse, and industrial water treatment. As a green membrane separation technology, forward osmosis (FO) has great application potential in sewage treatment and recycling. Forward osmosis refers to the process of water flowing from the side of lower osmotic pressure to the side of higher osmotic pressure through a selectively permeable membrane. Forward osmosis technology has attracted extensive attention from scholars at home and abroad because of its advantages such as low energy consumption, low membrane fouling, and high water recovery. [0003] The development of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D69/12B01D69/08B01D69/02B01D61/00
CPCB01D61/002B01D69/02B01D69/087B01D69/12B01D71/48B01D2325/36B01D2325/30B01D2325/24
Inventor 王磊李陈张慧慧陈立成王旭东吕永涛苗瑞朱振亚王雷磊王佳璇刘婷婷
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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