Method for preparing polyamide composite nanofiltration membrane based on green and environment-friendly ionic liquid

A composite nanofiltration membrane and ionic liquid technology, which is applied in the field of preparing polyamide composite nanofiltration membranes based on green and environment-friendly ionic liquids, can solve problems such as toxicity, environmental and human injury, and are not environmentally friendly, and achieves low vapor pressure and ease of use. Pollution and easy recycling

Inactive Publication Date: 2021-06-11
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The nanofiltration membrane prepared by the traditional interfacial polymerization method uses volatile alkane solvents (such as hexane) in the preparation process, which has certain toxicity and will cause harm to the environment and human body, and is not environmentally friendly.

Method used

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  • Method for preparing polyamide composite nanofiltration membrane based on green and environment-friendly ionic liquid
  • Method for preparing polyamide composite nanofiltration membrane based on green and environment-friendly ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The method for preparing a polyamide composite nanofiltration membrane based on a green environment-friendly ionic liquid comprises the following steps:

[0030] Step (1) adopts ionic liquid 1-ethyl-3-methylimidazole acetate as the solvent for dissolving polym-phenylene isophthalamide (i.e. PMIA), and forms a film-casting solution after dissolving to prepare PMIA porous base Membrane; the concentration of polymer PMIA in the casting solution is 16% w / v, and the average relative molecular mass of PMIA is 200000 (provided by Yantai Taihe New Materials Co., Ltd.). Among them, the porous base film can be produced by the following process: the casting solution is evenly scraped on the glass plate with an automatic scraper, the thickness of the scraper is 200 μm, and after standing in the air for 1 minute, the glass plate with the film solution is quickly and horizontally immersed in a water bath at room temperature , until the membrane was peeled off from the peeling substra...

Embodiment 2

[0038] In step a of step (2) of embodiment 1, the ratio of polyethyleneimine (PEI), piperazine (PIP), and water is adjusted to 0.02g: 0.1g: 120g; In step c, the drying temperature and time are adjusted to 60° C. and 10 min; the rest of the process parameters are the same as in Example 1. The infrared spectrum of the prepared polyamide composite nanofiltration membrane is shown in the attached figure 2 As shown, the characterization data prove that we have successfully prepared a polyamide selective layer on the surface of PMIA porous base membrane. The prepared polyamide composite nanofiltration membrane was used in the membrane separation of Congo red dye / methanol solution for nanofiltration experiments using a dead-end filtration device. In the experiment, the membrane to be tested was pre-compressed under a certain pressure for a period of time, and after reaching a steady state, the nanofiltration experiment was performed and data was collected. The results showed that ...

Embodiment 3

[0040]In step a of step (2) of embodiment 1, the ratio of polyethyleneimine (PEI), piperazine (PIP), and water is adjusted to 0.02g: 0.2g: 100g; In step c, the drying temperature and time are adjusted to 70° C. and 8 min; the rest of the process parameters are the same as in Example 1. The prepared polyamide composite nanofiltration membrane was used in the membrane separation of rhodamine B dye / ethanol solution for nanofiltration experiments using a dead-end filtration device. In the experiment, the membrane to be tested was pre-compressed under a certain pressure for a period of time, and after reaching a steady state, the nanofiltration experiment was performed and data was collected. The results showed that the retention rate of rhodamine B dye was 99.8%, and the penetration amount reached 1.7L h -1 m -2 bar -1 .

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Abstract

The invention discloses a method for preparing a polyamide composite nanofiltration membrane based on a green and environment-friendly ionic liquid, which comprises the following steps: dissolving a polymer (poly (m-phenylene isophthalamide)) by using the green and environment-friendly ionic liquid (1-ethyl-3-methylimidazole acetate) to prepare a porous base membrane; and using another green and environment-friendly ionic liquid (1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt) as an oil phase for interfacial polymerization on the surface of the base membrane to prepare a polyamide selection layer under the condition that both the ionic liquid phase and the water phase adopt mixed monomers, so that the polyamide composite nanofiltration membrane with high separation performance is obtained. The process is low in cost, safe, green and environment-friendly. The polyamide composite nanofiltration membrane prepared by the process has an excellent separation effect on organic solutions containing Congo red, acid red 94, solvent red, brilliant blue R, amaranth red, rhodamine B, vitamin B12 and other dyes (or drugs).

Description

technical field [0001] The invention relates to a method for preparing a polyamide composite nanofiltration membrane based on a green and environment-friendly ionic liquid. Background technique [0002] In recent years, membrane separation technology has gained widespread attention in the fields of organic solvent recovery, drug purification, and saline wastewater treatment due to its advantages of simple operation, high separation efficiency, low investment, and low maintenance cost. Among them, nanofiltration (NF) is a new pressure-driven membrane separation technology developed since the 1980s, and has practical applications in many chemical industries. [0003] The preparation methods of nanofiltration membranes mainly include phase inversion method, composite method, blending method, etc. Among them, the composite method is the most widely used. This method refers to compounding a layer of ultra-thin surface layer with nano-scale pore size on the surface of the micropor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00B01D61/02
CPCB01D69/12B01D71/56B01D67/0002B01D61/027
Inventor 詹国武郑大渊花丹纪镁铃
Owner HUAQIAO UNIVERSITY
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