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Preparation method of ultrathin high network structural nanofiltration composite membrane

A technology of network structure and composite membrane, which is applied in the field of nanofiltration membrane, can solve the problem of low rejection rate of monovalent salt ions, and achieve the effect of widening the range of selection, increasing flux and rejection rate

Active Publication Date: 2013-08-28
浙江奥氏环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with reverse osmosis, nanofiltration can have a higher flux at a lower operating pressure, and can efficiently intercept divalent salt ions and organic compounds with a molecular weight higher than the membrane cut-off molecular weight, but has a lower rejection rate for monovalent salt ions

Method used

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  • Preparation method of ultrathin high network structural nanofiltration composite membrane
  • Preparation method of ultrathin high network structural nanofiltration composite membrane
  • Preparation method of ultrathin high network structural nanofiltration composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Trimelliticoyl chloride and 1-formaldehyde piperazine were reacted with stirring at room temperature for 24 hours at a molar ratio of 1:4. Filter after the completion of the reaction, the filter cake is washed 3 times with chloroform, and after drying, trimesoylpiperazine formaldehyde is obtained, which is dissolved in anhydrous methanol, and the concentrated hydrochloric acid (mass volume concentration) of 1 / 4 anhydrous methanol volume is added. 38%), stirred for 6 h, filtered, the filter cake was washed 3 times with anhydrous methanol, and dried to obtain trimesoylpiperazine hydrochloride.

[0020] Immerse the polysulfone bottom membrane in an aqueous solution of trimesoylpiperazine hydrochloride (sodium hydroxide adjusts the pH to 11) with a mass volume concentration of 1.3% for 10 minutes, remove excess aqueous solution on the surface of the polysulfone bottom membrane, and wait until the surface moisture of the membrane is naturally Air-dried for 5 minutes, immerse...

Embodiment 14

[0038] Embodiment 14 adopts piperazine as the water phase functional monomer, and the mass volume concentration of its aqueous solution is 0.26%, to ensure that the molar concentration of the reactive imine group in the water phase solution is the same as that of trimesoylpiperazine hydrochloride in Example 1. The salt solution is the same, 0.06 mol / l. Other conditions are all identical with embodiment 1. The test results are:

[0039]

[0040] Embodiments 15-16 prepare nanofiltration composite membranes with a mass volume concentration of 1.3% trimesoylpiperazine hydrochloride aqueous solution and a mass volume concentration of 0.26% piperazine aqueous solution as the aqueous phase, and other conditions are the same as in Example 1 . At 25°C and 0.6MPa, 1000ppm of PEG 200 was used as the feed solution to test its interception performance on small molecular organics. The test results are:

[0041]

[0042] The comparison of Examples 1 and 14 and 15 and 16 shows that un...

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Abstract

The invention discloses a preparation method of an ultrathin high network structural nanofiltration composite membrane, comprising the following steps of: performing a reaction between benzenetricarbonyl trichloride and 1-formaldehyde piperazine with stirring at normal temperature, followed by filtering, solvent washing and drying to obtain trimesoyl piperazine formaldehyde, dissolving trimesoyl piperazine formaldehyde in anhydrous methanol, adding concentrated hydrochloric acid with stirring, filtering, washing, drying to obtain a trimesoyl piperazine hydrochloride monomer, and performing interfacial polymerization between trimesoyl piperazine hydrochloride monomer and benzenetricarbonyl trichloride to prepare the ultrathin high network structural nanofiltration composite membrane. The preparation method of the ultrathin high network structural nanofiltration composite membrane has advantages of simple technology and low cost. In comparison with a traditional polypiperazine-amide nanofiltration composite membrane, the nanofiltration composite membrane obtained by the adoption of the method has thinner cortex and higher crosslinking degree. In addition, its flux and retention rateare both raised.

Description

technical field [0001] The invention relates to the field of nanofiltration membranes, in particular to a method for synthesizing a novel aqueous phase monomer and synthesizing ultrathin and high network structure nanofiltration composite membranes. Background technique [0002] Nanofiltration can be traced back to the 1970s, and is a new membrane separation technology between reverse osmosis and ultrafiltration. Compared with reverse osmosis, nanofiltration can have a higher flux at a lower operating pressure, and can efficiently intercept divalent salt ions and organic compounds with a molecular weight higher than the membrane cut-off molecular weight, but has a lower rejection rate for monovalent salt ions . Due to its own characteristics, nanofiltration is widely used in brackish water desalination, micro-pollutant removal, hard water softening, wastewater treatment, dye retention, etc. [0003] Nanofiltration membranes can generally be prepared by methods such as phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12
Inventor 张林邹凯伦王丽红董航陈欢林周志军
Owner 浙江奥氏环境科技有限公司