Preparation method of polymer porous membrane for removing water pollutants

A technology of water pollutants and polymer membranes, applied in the field of separation membranes, can solve the problems of complex operation process, cyclodextrin and its derivative components are easy to lose and cannot be removed, and achieve simple preparation process and large-scale continuous Separation and automatic operation, the effect of fast separation speed

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above scheme blends cyclodextrin or its derivatives with the membrane material. Although the prepared membrane has good molecular recognition characteristics and maintains the good flexibility and strength of the membrane material itself, the separation process of cyclodextrin and its derivatives The main pollutants in the wastewater cannot be removed through simple treatment.

Method used

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  • Preparation method of polymer porous membrane for removing water pollutants
  • Preparation method of polymer porous membrane for removing water pollutants
  • Preparation method of polymer porous membrane for removing water pollutants

Examples

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preparation example Construction

[0045] 3) Preparation of polymer porous membrane: prepare a polymer porous membrane with the casting solution prepared in step 2, and the polymer porous membrane is a polymer flat membrane or a polymer hollow fiber membrane.

[0046] On the basis of the above scheme, the polymer membrane material described in step 1) is polysulfone, polyethersulfone, polyvinylidene fluoride, naphthalene polyether sulfone ketone, polyacrylonitrile, polyvinyl alcohol, polyether ether A combination of any one or two or more of ketone, polyetherimide or polyvinyl chloride in any ratio, preferably polysulfone, polyethersulfone, polyvinylidene fluoride or naphthalene polyethersulfone ketone Any one or two or more of the composition in any ratio.

[0047] On the basis of the above scheme, the porogen in step 1) is any one or two or more of water-soluble polymer polyvinylpyrrolidone, polyethylene glycol, formic acid, acetic acid, nano-silica or titanium dioxide Proportioning composition.

[0048] On the ba...

Embodiment 1

[0068] The dried polymer membrane material polysulfone 8g, 0.1g porogen nano titanium dioxide, dissolved in 86.9g N,N-dimethylacetamide organic solvent, heated to increase the temperature, fully stirred at 50 ℃ until the polymer The membrane material is completely dissolved, continue to heat up under stirring conditions, when the temperature rises to 80°C, add 5g of α-cyclodextrin to the above solution, continue to stir to make it fully swell and dissolve, and prepare a mixed solution;

[0069] Maintain the temperature of the mixed solution at 80°C, add 5g of the cross-linking agent epichlorohydrin to the mixed solution, cross-link at 80°C for 5 hours, stand still, filter, and vacuum to defoam to obtain a casting solution;

[0070] First take the weight per unit area as 71.5g / m 2 , The polyester non-woven fabric base film with the pore size range of 23.31μm is installed on the film scraper, and then the prepared casting liquid is poured into the hopper of the film scraper, and the c...

Embodiment 2

[0072] Take the dried polymer membrane material 14g polyethersulfone and 2g polysulfone, a porogen consisting of 7g polyethylene glycol and 3g acetic acid, dissolve it in 66g N-methylpyrrolidone organic solvent, heat it up, and keep it at 40℃. Fully stir until the polymer film material is completely dissolved, continue to heat up under stirring conditions, when the temperature rises to 50 ℃, add 8g β-cyclodextrin (such as figure 1 , 2 Shown), continue to stir to fully swell and dissolve, and prepare a mixed solution;

[0073] Maintain the temperature of the mixed solution at 50°C, add 25g of the crosslinking agent 1,2-ethylene glycol diglycidyl ether to the mixed solution, crosslink the reaction at 50°C for 12 hours, stand, filter, vacuum defoaming Get the casting liquid;

[0074] First take the weight per unit area as 36.9g / m 2 , The polyester non-woven fabric base film with the pore size range of 23.21μm is installed on the film scraper, and then the prepared casting liquid is po...

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Abstract

The invention relates to the technical field of separation membranes and discloses a preparation method of a polymer porous membrane for removing water pollutants. The preparation method comprises the following steps of blending cyclodextrin and a membrane preparation material, and adding a cross-linking agent into the mixture to fix the cyclodextrin to the membrane material so that repeated use is avoided, cyclodextrin is lost from the polymer porous membrane, a selective separation function of the polymer porous membrane is lost and polymer porous membrane hydrophility is changed. The polymer porous membrane has a substantial capability of adsorption and removal of organic pollutants such as phenols and aromatic amines (aromatic substances) in water, has good heavy metal ion removal effects, has high separation efficiency and low pressure drop, is convenient for regeneration, can be massively produced and used easily, and can be widely used in an ecological protection water purification treatment system and a water treatment system.

Description

Technical field [0001] The present invention relates to the technical field of separation membranes, in particular to a preparation method of polymer porous membranes used to remove pollutants in water bodies, in particular to a regenerable polymer membrane used to remove pollutants in water bodies based on the molecular recognition of cyclodextrin Method of preparing polymer film. Background technique [0002] With the continuous growth of the global economy and the world’s population, problems such as resource shortages and environmental pollution have become increasingly serious. Environmental protection, especially the protection of water resources, has received widespread attention from the whole society. my country is one of the thirteen most water-poor countries in the world, and large-scale industrial production consumes a lot of water resources and also produces a lot of industrial sewage. Therefore, we strengthen the protection and purification of water resources and im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/06B01D69/08C02F1/44
Inventor 杨丽魏昕奚振宇许树华
Owner CHINA PETROLEUM & CHEM CORP
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