Composite nano filtration membrane with high selectivity on removing divalent ions and preparation method thereof

A composite nanofiltration membrane and high-selectivity technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as the performance difference of nanofiltration membranes, and achieve the effect of improving selective removal

Active Publication Date: 2016-03-30
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that due to the different molecular structures of m-phenylenediamine and piperazine, there is a large difference between the properties of the corresponding prepared nanofiltration membranes.

Method used

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  • Composite nano filtration membrane with high selectivity on removing divalent ions and preparation method thereof
  • Composite nano filtration membrane with high selectivity on removing divalent ions and preparation method thereof
  • Composite nano filtration membrane with high selectivity on removing divalent ions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A composite nanofiltration membrane with high selectivity for the removal of divalent ions, which consists of a non-woven fabric layer, a polysulfone porous support layer, a cross-linked desalination layer and a charge-grafted functional layer, wherein the polysulfone porous support layer It is arranged on the non-woven fabric layer, and the cross-linked desalination layer and the charged grafted functional layer are sequentially arranged on the polysulfone porous support layer; the cross-linked desalination layer is prepared by reacting the amine mixture and the acid chloride monomer mixture at the oil-water phase interface; The electrografting functional layer is grafted on the cross-linked desalination layer through surface chemistry. The amine mixture is formed by mixing aliphatic amines and aromatic amines; the acyl chloride monomer mixture is formed by mixing acyl chloride monomers with bifunctionality and acyl chloride monomers with trifunctionality in any ratio. ...

Embodiment 2- Embodiment 6

[0058] On the basis of embodiment 1, other changes on the basis of embodiment 1 are as follows:

[0059]

[0060]

[0061]

Embodiment 7

[0064] A 19% polysulfone solution is prepared, and a porous polymer support layer is prepared by a liquid-solid phase conversion method. A solution containing 0.5 wt% hexamethylenediamine and 2.0% m-phenylenediamine was prepared, and an appropriate amount of NaOH was added to adjust the pH value to about 11 to obtain a mixed amine solution (A solution). A 0.22 wt% trimesoyl chloride solution (solution B) was prepared, wherein the solvent was cyclohexane. Prepare 0.3% glycerol ether aqueous solution (C solution), the catalyst is hydrochloric acid, the concentration is 0.05%. Soak the polysulfone porous support layer in solution A for 30 s, drain the water droplets on the membrane surface, and then enter solution B for 20 s, take it out and dry it at room temperature to remove the cyclohexane on the membrane surface. The cyclohexane-removed membrane was placed in solution C, soaked for 50s, and then taken out in an oven at 80°C for heat treatment for 5 minutes. Take out the pr...

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Abstract

The invention relates to the technical field of nano filtration membrane and preparation thereof, and especially relates to a composite nano filtration membrane with a high selectivity on removing divalent ions and a preparation method thereof. The preparation method is characterized in that a mixedly crosslinking desalination layer and a charged grafted functional layer for enhancing ion selectivity are arranged on a polysulfone porous support layer; through the mixed crosslinking of aromatic amine and aliphatic amine, the molecular crosslinking structure of the desalination layer is adjusted, thus the crosslinking desalination layer has a unique smooth particle accumulation structure, which is better than the structure of a conventional nano filtration membrane desalination layer; and moreover, the introduced charged grafted functional layer enhances the effect of charge density and groups in ion selectivity and ion rejection. So that the sodium chloride desalination rate of the prepared composite nano filtrate membrane is less than 40%, the magnesium chloride desalination rate is more than 97%, the magnesium sulfate desalination rate is more than 98%, the calcium chloride desalination rate is more than 93%; the removal ratio of monovalent ion to divalent ion is high, the monovalent ions and divalent ions can be effectively separated, and the selective removal of divalent ions is improved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane and its preparation, in particular to a composite nanofiltration membrane with high selectivity for removing divalent ions and a preparation method thereof. Background technique [0002] Nanofiltration is one of the pressure-driven membrane processes. Because of its low energy consumption and high ion selectivity, it has been widely used in the fields of material concentration, sewage treatment, brine purification and pharmaceutical separation. The transfer process of solute molecules or ions in nanofiltration membranes is usually complicated and controlled by Donnan effect, steric effect, dielectric effect and mass transfer. The microfluidic dynamics and interfacial events involved in the nanofiltration process are usually closely related to the molecular size of the solute, the charging properties of the solute and the membrane, the membrane pore structure, and the liquid enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/60B01D69/12B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D69/12B01D71/60B01D2323/12
Inventor 梁松苗许国杨吴宗策蔡志奇金焱
Owner VONTRON TECH CO LTD
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