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Preparation method of high-desalination solvent-resistant polyamide composite nanofiltration membrane

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of cumbersome cost, difficult treatment and recovery, etc., and achieve low cost, simple operation, and easy raw materials The effect

Inactive Publication Date: 2021-03-19
中复新水源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in petrochemical and other fields, high-salt wastewater is usually produced, which not only contains a small amount of organic solvents, but also contains a large amount of monovalent and divalent salts, which makes its treatment and recovery very difficult, and often requires multiple steps. Process synergy, cumbersome and costly

Method used

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  • Preparation method of high-desalination solvent-resistant polyamide composite nanofiltration membrane
  • Preparation method of high-desalination solvent-resistant polyamide composite nanofiltration membrane
  • Preparation method of high-desalination solvent-resistant polyamide composite nanofiltration membrane

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Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: a kind of preparation method of high desalination solvent-resistant polyamide composite nanofiltration membrane, it comprises the following steps:

[0044] Step (1): the dry p-phenylenediamine is dissolved in ethanol with a mass concentration of 10%, fully stirred for 2 hours and left to stand for later use;

[0045] Step (2): Dissolve the raw material of the pyromellitic polyimide (synthesis of pyromellitic dianhydride and 4,4'-diaminodiphenyl ether) into N,N-dimethylmethane at a mass concentration of 20%. amide, stir evenly, then coat the polyester support layer at 120 μm, and then immerse it in pure water for 24 hours to obtain a polyimide ultrafiltration membrane;

[0046] Step (3): Place the polyimide composite ultrafiltration membrane prepared in step (2) on a clean and flat glass plate, press the customized plate frame tightly on the membrane surface, and fix it with clips. The cross-linking agent solution in step (1) was evenly poured on the membr...

Embodiment 2

[0053] Embodiment 2: a kind of preparation method of high desalination solvent-resistant polyamide composite nanofiltration membrane, it comprises the following steps:

[0054] Step (1): the dry m-phenylenediamine is dissolved in pure water with a mass concentration of 8%, fully stirred for 2 hours and left to stand for later use;

[0055] Step (2): Synthesize the raw material of the pyromellitic type polyimide (synthesis of pyromellitic dianhydride and 3,3',5,5'-tetramethyl-4,4'-diaminodiphenylmethane) by mass The concentration of 18% was dissolved in N-methylpyrrolidone, stirred evenly, and then coated on the polyester support layer with a thickness of 150 μm, and then immersed in pure water containing 10% methanol for 24 hours to obtain a polyimide ultrafiltration membrane ;

[0056] Step (3): place the polyimide ultrafiltration membrane prepared in step (2) on a clean and flat glass plate, press the customized plate frame tightly on the membrane surface, and fix it with a...

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Abstract

The invention discloses a preparation method of a high-desalination solvent-resistant polyamide composite nanofiltration membrane. Th method comprises the following steps: selecting a specific diaminecrosslinking agent solution through a chemical crosslinking method, carrying out crosslinking modification on the solution and a traditional polyimide ultrafiltration membrane to form a membrane, andcompounding the membrane with a piperazine monomer raw material and an acyl chloride monomer raw material through an interfacial polymerization method to obtain the polyamide composite nanofiltrationmembrane. The high-desalination solvent-resistant polyamide composite nanofiltration membrane prepared by the preparation method disclosed by the invention not only maintains high interception performance on divalent salt, but also greatly improves the interception performance on monovalent salt, has extremely strong tolerance on some organic solvents such as methanol, ethanol and n-hexane, can solve the problems of low monovalent salt desalination rate and organic solvent system desalination of the nanofiltration membrane in the prior art, is low in cost, and has important application prospects.

Description

technical field [0001] The invention relates to a preparation method of an organic polymer separation membrane, in particular to a preparation method of a high desalination solvent-resistant polyamide composite nanofiltration membrane with excellent performance. Background technique [0002] Nanofiltration membrane is a kind of separation membrane with the same pore size specification and rated pore size is generally 1-2nm. Nanofiltration membrane is named because the size of the intercepted material is about nanometer size, and it can effectively intercept divalent and high-valent ions and organic molecules with a relative molecular mass higher than 200. Nanofiltration membrane separation is carried out at room temperature, no phase change, no chemical reaction, no damage to biological activity, low cost, and is widely used to remove organic matter and chromaticity of surface water, remove the hardness of groundwater, and partially remove dissolved salts , concentrated fru...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/56B01D69/06B01D69/08B01D69/04
CPCB01D69/12B01D69/125B01D67/0006B01D71/56B01D69/06B01D69/08B01D69/04
Inventor 徐卫星杨乘宇王一光南洋乔光辉
Owner 中复新水源科技有限公司