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High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane

A composite nanofiltration membrane, organic solvent-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Low membrane flux and other problems, to achieve the effect of improving flux and selective rejection performance, easy operation and control, and high flux

Inactive Publication Date: 2015-01-07
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the prior art, in order to obtain a higher rejection rate for polyamide nanofiltration membranes in most studies, the monomer concentration used is often high, and the water phase immersion time and interfacial polymerization reaction time are relatively long. The nanofiltration membrane flux is low
In order to obtain high throughput, while increasing the operating pressure, the energy consumption is also greatly increased

Method used

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  • High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane
  • High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane
  • High-performance composite nanofiltration membrane with resistance to oxidation of organic solvent and chlorine, as well as preparation method and application of membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The used high molecular polymer amine, polybasic acid chloride, acid acceptor and surfactant are the same as those of the comparative example. Sodium chloride was added as a supporting electrolyte when preparing the aqueous phase monomer solution. The concentration of the supporting electrolyte in the aqueous monomer solution is 0.5 mol / L, the mass percent concentration of the surfactant is 0.002%, other parameters and processes are the same as those of the comparative example, and the test conditions are the same as those of the comparative example. The nanofiltration membrane prepared in this example is to Na 2 SO 4 The rejection rate is 96%, and the solution flux is 53L / (m 2 h); the rejection rate to NaCl is 71%, and the solution flux is 55L / (m 2 h).

Embodiment 2

[0066] The high molecular polymer amine and polyacyl chloride used are the same as those of the comparative example. No acid acceptors and surfactants are added. Sodium chloride was added as a supporting electrolyte when preparing the aqueous phase monomer solution. The concentration of the supporting electrolyte in the aqueous phase monomer is 0.5mol / L, the immersion time of the modified base film in the aqueous phase monomer solution is 30min, other parameters and processes are the same as those of the comparative example, and the test conditions are the same as those of the comparative example. The nanofiltration membrane prepared in this example is to Na 2 SO 4 The rejection rate is 90%, and the solution flux is 62L / (m 2 h); the rejection rate to NaCl is 57%, and the solution flux is 63L / (m 2 h).

Embodiment 3

[0068] The high molecular polymer amine and polyacyl chloride used are the same as those of the comparative example. No acid acceptors and surfactants are added. Sodium chloride was added as a supporting electrolyte when preparing the aqueous phase monomer solution. The mass percentage concentration of polymer amine in the aqueous phase monomer is 0.8%, the concentration of supporting electrolyte is 0.5mol / L, other parameters and processes are the same as those of the comparative example, and the test conditions are the same as those of the comparative example. The nanofiltration membrane prepared in this example is to Na 2 SO 4 The rejection rate is 96%, and the solution flux is 52L / (m 2 h); the rejection rate to NaCl is 53%, and the solution flux is 59L / (m 2 h).

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Abstract

The invention relates to a high-performance composite nanofiltration membrane with resistance to oxidation of an organic solvent and chlorine, as well as a preparation method and application of the membrane. According to the preparation method, an interfacial polymerization process is interfered by supporting electrolyte, so that the density of aqueous phase monomers adsorbed on the surface of the membrane is increased, a base membrane is closely connected with an active layer, and the active layer is compact while the thickness of the active layer is reduced; therefore, high permeation flux can be obtained while low-concentration monomers are used, and high selectivity is maintained. The composite nanofiltration membrane has the properties of resisting to oxidation of the organic solvent and chlorine, under the pressure of 1.0 MPa and at the temperature of 25 DEG C, the flux of 2g / L sodium sulfate aqueous solution is 25-65 L / (m<2>.h), and retention rate is 85-99%; the flux of 2g / L sodium chloride aqueous solution is 30-60 L / (m<2>.h), and the retention rate is 50-75%.

Description

technical field [0001] The invention belongs to the technical field of preparation of separation membranes, in particular to a high-performance composite nanofiltration membrane resistant to organic solvents and chlorine oxidation, its preparation method and application. Background technique [0002] Nanofiltration (nanofiltration, NF) of the present invention is a pressure-driven membrane process between ultrafiltration and reverse osmosis, and is named for its membrane pore size of about 1 nm. The molecular weight cut-off of nanofiltration membrane is generally between 200 and 1000 Daltons. It has a high rejection rate for divalent and multivalent ions, and a low rejection rate for monovalent ions. It is especially suitable for separating organic compounds and divalent ions with a molecular weight of several hundred. Valence, polyvalent ions, etc. At present, nanofiltration membrane technology has been widely used in many fields such as food, chemical industry, medicine, ...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D71/60B01D69/02B01D69/12
Inventor 苏保卫邢雅南甄宏艳
Owner OCEAN UNIV OF CHINA
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