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Polyester polyamide amphoteric charge composite nanofiltration membrane and preparation method thereof

A technology of polyester polyamide and charge recombination, which is applied in the field of membrane separation, can solve problems such as complex water quality components, and achieve good retention performance and high permeation flux.

Active Publication Date: 2018-11-30
HUNAN KEENSEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in water treatment, the water quality components are often complex and contain various inorganic salts. The single charge characteristic of nanofiltration membranes limits its application to a large extent.

Method used

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  • Polyester polyamide amphoteric charge composite nanofiltration membrane and preparation method thereof
  • Polyester polyamide amphoteric charge composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0036] Immerse one side of the wet polysulfone microporous support membrane in an aqueous solution containing 1.0% to 3.0% of macromolecular polyols (respectively carboxylated chitosan, or cyclodextrin, or hyaluronic acid) for 10 minutes, and take out Afterwards, rinse with deionized water, dry in the air for 15 minutes, contact with n-hexane solution containing 0.2% trimesoyl chloride on one side for interfacial polymerization reaction for 10 minutes, and then react with polyethyleneimine containing 1.0% to 3.0% The aqueous solution is contacted for 10 minutes, and finally heat-treated in an oven at 50° C. for 10 minutes to obtain a polyester polyamide amphoteric charge composite nanofiltration membrane. The solute desalination rate and water flux of the membrane were tested with 500 mg / L sodium sulfate aqueous solution, magnesium chloride aqueous solution and sodium chloride aqueous solution at 0.6MPa, 25°C and pH 6.8 respectively. These several examples are to investigate t...

Embodiment 10-15

[0041] As in the previous example, according to the above method, 2.0% carboxylated chitosan aqueous solution and 1.0% polyethyleneimine aqueous solution were used to treat at 40-60° C. for 5-20 minutes. These examples are to investigate the influence of heat treatment temperature and time on the film performance, the results are shown in Table 2.

[0042] The performance measurement result of the composite nanofiltration membrane of table 2 embodiment 10-15

[0043]

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Abstract

The invention discloses a polyester polyamide amphoteric charge composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: firstly, enabling a polysulfone microporous support membrane to make contact with a macromolecular polyol aqueous solution, washing the surface and then drying in the air; secondly, enabling the dried polysulfone microporous support membrane to make contact with a trimesoyl chloride organic phase solution and carrying out single-sided interface polymerization reaction to form a composite membrane with an ultra-thin polyester layer; thirdly, enabling the composite membrane to make contact with a polyethylene imide aqueous solution, carrying out secondary interfacial polymerization reaction by utilizing residual acyl chloride to form an ultra-thin polyamide layer; fourthly, successively carrying out surface washing, drying and heat treatment to obtain the amphoteric charge composite nanofiltration membrane. The composite nanofiltration membrane disclosed by the invention has high permeate flux and retention rate; in addition, the preparation method has the advantages of simplicity, controllable reaction and capability of adjusting the separation performance of the membrane in a wider range.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a polyester polyamide amphoteric charge composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new pressure-driven membrane separation technology between ultrafiltration and reverse osmosis, which can effectively remove divalent and multivalent ions and various substances with a molecular weight greater than 200, and partially remove monovalent ions and substances with a molecular weight lower than 200 substances. The nanofiltration membrane is a charged membrane, and there are charged groups on or in the membrane, and its selective permeability is determined by the sieving effect and the charge effect. For inorganic salt solutions, the charge effect is more significant. The pore size and chargeability of the nanofiltration membrane depend on the membrane material and preparation process. The preparatio...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D69/02B01D69/12B01D71/56B01D71/68
CPCB01D61/027B01D69/02B01D69/12B01D71/56B01D71/68
Inventor 邬迪华赵红挺吴梦瑶刘雪松
Owner HUNAN KEENSEN TECH CO LTD
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