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Unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane and preparation method thereof

A fiber filter membrane and polymer technology, applied in the field of asymmetric chlorine-containing polymer-based charged hollow fiber filter membrane and its preparation, can solve the problems of rapid performance attenuation, performance degradation, etc., achieve stability, not easy to be damaged, reduce The effect of raw material cost and stable performance

Active Publication Date: 2016-03-02
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Generally, membranes prepared by surface coating, surface grafting, interface polymerization, interface crosslinking, etc. are prone to rapid performance decay during long-term operation, and the performance decline is very obvious after backwashing and other cleaning operations.

Method used

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  • Unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane and preparation method thereof
  • Unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane and preparation method thereof
  • Unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane and preparation method thereof

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preparation example Construction

[0048] A preparation method of an asymmetric chlorine-containing polymer-based charged hollow fiber filter membrane, wherein the preparation method of the internal pressure filter membrane comprises the following steps:

[0049] (1) Dissolving the chlorine-containing polymer to make a film-making solution, using the solution of polyamines as the core solution, and using the solution containing the porogen as the coagulation bath;

[0050] (2) The core liquid is passed into the center of the die, and the membrane-making liquid is extruded from the circular channel to form a tubular liquid film, which enters the coagulation bath vertically to solidify into a hollow fiber membrane;

[0051] (3) After heat-treating the hollow fiber membrane prepared in the step (2), washing is performed to obtain a charged hollow fiber filter membrane with an asymmetric chlorine-containing polymer matrix.

[0052] The preparation method of external pressure filter membrane comprises the following ...

Embodiment 1

[0064]Dissolve 20% polyvinyl chloride in N,N-dimethylacetamide to prepare a film-making solution, and blend the reaction product of tetraethylenepentamine and epoxy quaternary ammonium salt with tetraethylenepentamine in a composition of 1:1 80% aqueous solution is then configured as the core liquid, and the aqueous solution containing 4% polyvinyl alcohol is used as the coagulation bath. The membrane was heat-treated in a saturated water vapor environment at 65°C for 8 hours, soaked and washed for 24 hours, and a positively charged internal pressure hollow fiber nanofiltration membrane was obtained. The membrane manufacturing process and process are as follows: image 3 , Figure 4 shown.

[0065] The membrane prepared above was packaged into an internal pressure cross-flow filtration module. Under 0.3MPa, the recovery ratio was 15% to test its pure water flux and the rejection rate of 0.01% positively charged dye Victoria blue B solution and 0.2 % rejection of calcium chlo...

Embodiment 2

[0068] Dissolve 18% polyvinylidene chloride in N,N-dimethylformamide to prepare a film-making solution, and use the reaction product of ethylenediamine and epoxy quaternary ammonium salt and ethylenediamine as a 2:1 blend , and then configured into an 80% aqueous solution as the core liquid, and an alcohol solution containing 1% polyvinyl alcohol as a coagulation bath. Then heat-treat the membrane in a saturated water vapor environment at 50° C. for 20 hours, soak and wash for 24 hours, and obtain a positively charged internal pressure hollow fiber nanofiltration membrane.

[0069] The membrane prepared above was packaged into an internal pressure cross-flow filtration module. Under 0.3MPa, the recovery ratio was 15% to test its pure water flux and the rejection rate of 0.01% positively charged dye Victoria blue B solution and 0.2 % rejection of calcium chloride solution. Test results, the pure water flux is 92.8L / h m 2 , the retention rate of Victoria blue B solution was 98...

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Abstract

The invention discloses an unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane and a preparation method thereof. The hollow fiber filtration membrane comprises a dense functional layer, a transition layer and a macroporous support layer, the dense functional layer and the transition layer are each formed by conducting a reaction on a polyamine substance and a chlorine-containing polymer, and the support layer is composed of chlorine-containing polymer. The preparation method comprises the steps that the chlorine-containing polymer is dissolved and prepared into a membrane casting solution, and a solution of the polyamine substance and a reference solution containing a pore-foaming agent serve as core liquid and a coagulating bath respectively; the core liquid is fed into the center of a die head, the pore-foaming agent is extruded out of a circular ring pore channel to form a tubular liquid membrane, and the tubular liquid membrane perpendicularly enters the coagulating bath to be cured into the hollow fiber membrane; the prepared hollow fiber membrane is cleaned after being heat-treated, and the unsymmetrical chlorine-containing polymer-based charged type hollow fiber filtration membrane is obtained. The interception rate of the filtration membrane to dye is 95 percent or above, the interception rate to high-valence inorganic salt is 90 percent or above, and the pure water flux under the low pressure of 0.3 MPa can reach 90 L / h.m<2>.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to an asymmetric chlorine-containing polymer-based charged hollow fiber filter membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is an emerging separation technology. Driven by external energy or chemical potential difference, the separation membrane material can realize the functions of separation, classification, purification or enrichment of two-component or multi-component liquid or gas. Compared with traditional crafts, it has incomparable advantages. Membrane separation technology is widely used in the field of water treatment, mainly including sewage purification, water purification, seawater desalination, etc. According to different pore sizes, water treatment filtration membranes can be divided into ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, etc., to correspond to different cut-off...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/08B01D71/82B01D67/00B01D69/02
Inventor 朱宝库赵斌崔月肖玲王纳川王俊陈良刚陈清
Owner HAINAN LITREE PURIFYING TECH CO LTD
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