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Composite nanofiltration membrane for highly-efficient separation of monovalent and divalent salts

A composite nanofiltration membrane and divalent salt technology, applied in semi-permeable membrane separation, membrane technology, water/sludge/sewage treatment, etc., can solve the problems of inability to meet application requirements, low performance, etc., to improve anti-fouling ability , The effect of reducing energy consumption and high retention rate

Inactive Publication Date: 2019-09-24
埃姆媞(无锡)分离技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the technology of nanofiltration membranes has been continuously improved in recent years, and the application prospects are becoming wider and wider, the separation rate of monovalent salts and divalent salts in existing nanofiltration products can only reach 50-70% at most, and the performance is not good enough. Low, unable to meet the needs of practical applications

Method used

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  • Composite nanofiltration membrane for highly-efficient separation of monovalent and divalent salts
  • Composite nanofiltration membrane for highly-efficient separation of monovalent and divalent salts
  • Composite nanofiltration membrane for highly-efficient separation of monovalent and divalent salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0034] Adding nanometer material and surfactant alkylphenol polyoxyethyl ester phosphate into N-methylpyrrolidone (NMP) organic solvent, ultrasonication, stirring and dispersing to form a uniform suspension.

[0035] The base membrane material polysulfone and cellulose are gradually added to the above suspension under stirring, wherein polysulfone, NMP and cellulose are made according to the mixing ratio of 65:25:10, and the inorganic porogen lithium nitrate or chlorine is added Sodium chloride, magnetically stirred for 24 hours to form a uniform casting solution, filtered with a 100-mesh non-woven fabric in an environment with a humidity lower than 40%, and then ultrasonic-vacuum filtration repeated 3 times for degassing. Cast the defoamed casting solution onto a PET (polyester---polyethylene terephthalate) woven cloth with a thickness of 5mil as a support material to form the primary ecology of a uniformly porous base film flat film, or through spinning Sheets are extruded i...

Embodiment 4-8

[0043] As in the previous examples, according to the above method, add the nanomaterials and polyoxyethyl phenol phosphate into the organic solvent, and disperse by ultrasonication and stirring to form a uniform suspension. The base film material polysulfone and cellulose are gradually added into the suspension under stirring, wherein the polysulfone, organic solvent and cellulose are made according to different mixing ratios.

[0044] The prepared composite nanofiltration membrane was tested with 500mg / l sodium chloride aqueous solution and sodium sulfate aqueous solution at 1.0MPa, 25°C and pH6.8 to test the solute removal rate and water flux of the membrane.

[0045] These several examples are to investigate the influence of the type of organic solvent on the performance of the composite nanofiltration membrane, and the results are shown in Table 2.

[0046]

[0047] As can be seen from the above table, the addition of nanomaterials and alkylphenol polyoxyethyl ester pho...

Embodiment 9-12

[0049]As in the previous examples, according to the above method, add nanomaterials and surfactant alkylphenol polyoxyethyl ester phosphate into N-methylpyrrolidone (NMP) organic solvent, ultrasonically, stir and disperse to form a uniform suspension. The base membrane material polysulfone and cellulose are gradually added into the suspension under stirring, wherein polysulfone, NMP and cellulose are made according to different mixing ratios.

[0050] The prepared composite nanofiltration membrane was tested with 500mg / l sodium chloride aqueous solution and sodium sulfate aqueous solution at 1.0MPa, 25°C and pH6.8 to test the solute removal rate and water flux of the membrane.

[0051] These several examples are to investigate the effect of the mixing ratio of polysulfone, NMP and cellulose on the performance of the composite nanofiltration membrane, and the results are shown in Table 3.

[0052]

[0053] It can be seen from the above table that the mixing ratio of polysulf...

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Abstract

The invention belongs to the technical field of membranes, and protects a composite nanofiltration membrane for highly-efficient separation of monovalent and divalent salts. The composite nanofiltration membrane comprises a supporting layer and a base film layer stacked on the supporting layer, wherein the supporting layer is a polyethylene terephthalate (PET) non-woven fabric with a thickness of 2 to 5 mil; a liquid-state film preparation liquid of the base film layer comprises the following components: a nanofiltration polymer, an organic solvent and cellulose; the liquid-state film preparation liquid is coated onto the supporting layer to form a uniform-pore base film layer with a thickness of 2 to 5 mil; a mixed coating feed liquid is coated onto the surface of the uniform-pore base film layer with a treatment time of 20 to 90 seconds, a treatment temperature of no lower than 60 DEG C and a humidity of less than 60%; and the mixed coating feed liquid is prepared from a benzene polymer and an ether hydrophilic curing agent. The nanofiltration membrane provided by the invention has the following advantages: by selection of the PET non-woven fabric with a specific thickness, and addition of a special composite raw material namely the cellulose in a base film, highly-efficient separation of the monovalent and divalent salts can be realized; meanwhile, the preparation method provided by the invention has the advantages of simple operation process, mild reaction conditions, low production cost and good industrial production application prospect.

Description

technical field [0001] The invention relates to the field of polymer separation membranes, in particular to a composite nanofiltration membrane for efficient separation of monovalent and divalent salts. Background technique [0002] Nanofiltration membrane is an organic polymer composite membrane, which is a kind of high-end filtration separation product between reverse osmosis membrane and ultrafiltration membrane. Monosaccharides, polypeptide small molecules, monovalent and divalent salts, etc. Compared with other separation membranes, nanofiltration membranes have the characteristics of larger membrane flux, low process osmotic pressure, selective separation of ions, low operating pressure, and low power requirements of the system. At present, nanofiltration membrane technology has been widely used in water softening and brackish water desalination, drinking water purification, material separation and purification and concentration, wastewater treatment and reclaimed wat...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/10B01D61/02C02F1/44
CPCB01D61/027B01D69/10B01D71/68C02F1/442
Inventor 马秋风
Owner 埃姆媞(无锡)分离技术有限公司
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