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Method for preparing composite charged mosaic membrane via interfacial polymerization

A technology of interfacial polymerization and charged mosaic, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of backward nanofiltration membrane preparation technology of charged mosaic membrane, no industrial membrane modules, membrane production Harsh process conditions and other issues, to achieve good interception capacity, good permeability, and facilitate industrial production

Inactive Publication Date: 2009-09-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although gratifying progress has been made in the preparation of charged mosaic membranes and related research in the early stage, the main problems are as follows: (1) The charging process of microscopic groups in the membrane is relatively complicated, and the membrane-making process conditions are relatively harsh; (2) The selection layer is relatively thick (the thickness of the membrane is generally about 50 μm), and the membrane flux is relatively small under a certain operating pressure difference; (3) the relevant patents belong to the results of small laboratory tests
In contrast, the preparation technology of charged mosaic membranes is far behind nanofiltration membranes, and no industrial membrane modules have been formed, and the application of pilot scale has not been reported yet.

Method used

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  • Method for preparing composite charged mosaic membrane via interfacial polymerization
  • Method for preparing composite charged mosaic membrane via interfacial polymerization
  • Method for preparing composite charged mosaic membrane via interfacial polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The polysulfone ultrafiltration membrane is used as the supporting membrane, the mixed aqueous solution of polyethyleneimine (PEI) and 2,5-diaminobenzenesulfonic acid (DIA) is used as the inorganic phase, and the n-hexane solution of trimesoyl chloride (TMC) As the organic phase, a composite charged mosaic film was prepared by interfacial polymerization. Proceed as follows:

[0042] (1) Select polysulfone (PS) flat ultrafiltration membrane as base membrane (water flux is 200-300L m -2 h -1 · bar -1 , cut molecular weight is about 50000-80000);

[0043] (2) prepare inorganic phase solution, the mass percent concentration of PEI is 1.0% in the inorganic phase solution; The mass percent concentration of DIA is 1.0%; Sodium carbonate mass percent concentration is 0.2%, sodium bicarbonate mass percent concentration is 0.1%; the mass percent concentration of sodium lauryl sulfate is 0.1%. Introduce the inorganic phase solution on the surface of the dense layer of the ult...

Embodiment 2

[0060] The polyethersulfone (PES) flat ultrafiltration membrane is used as the base membrane, the mixed aqueous solution of polyepichlorohydrin amine (PECH-amine) and DIA is used as the inorganic phase, and the n-hexane solution of TMC is used as the organic phase. Electrical mosaic film.

[0061] Referring to Example 1 step, take polyethersulfone (PES) flat ultrafiltration membrane as base membrane (water flux is 100-150L m -2 h -1 · bar -1 , the cutting molecular weight is about 10000-20000), the mass percentage concentration of polyepichlorohydrin amine (PECH-amine) in the inorganic phase solution is 1.2%; the mass percentage concentration of DIA is 1.4%; the sodium carbonate concentration mass percentage The concentration is 0.1%; the mass percent concentration of TMC in the organic phase is 1.0%; the interfacial polymerization time is 180s. After the interfacial polymerization, the composite film is placed in a vacuum drying oven and heat-treated at 80-110°C for 10min , ...

Embodiment 3

[0067] The polyethersulfone hollow fiber ultrafiltration membrane is used as the supporting membrane, the mixed aqueous solution of polyethyleneimine (PEI) and 2,5-diaminobenzenesulfonic acid (DIA) is used as the inorganic phase, and the n-hexane solution of TMC is used as the organic phase , to prepare composite charge-mosaic membranes by interfacial polymerization.

[0068] With reference to the steps of Example 1, using polyethersulfone (PES) hollow fiber ultrafiltration membrane as the supporting membrane (the inner diameter of the membrane is 0.630mm, the membrane thickness is 0.350mm and the molecular weight cut-off is 50000-80000), the mass percentage concentration of PEI in the inorganic phase solution 0.85%; the mass percentage concentration of DIA is 0.75%; the mass percentage concentration of acid acceptor is 0.3%, and the ratio of sodium carbonate and sodium bicarbonate is 1:2; the mass percentage concentration of surfactant is 0.1%; in the organic phase The mass p...

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Abstract

The invention belongs to the field of membrane technique and discloses a method for preparing composite charged mosaic membrane via interfacial polymerization, characterized in that an ultra-filtration membrane is used as a support body; a quite thin selection layer is compounded on the support body of the ultra-filtration membrane by optimizing an interfacial polymeric monomer and by means of the interfacial polymerization; a cation exchange group and an anion exchange group are introduced to the selection layer at the same time, so that the selection layer owns structures and characteristics of the mosaic membrane; and the composite charged mosaic membrane. In comparison with other methods for preparing composite membrane, the method has the advantages that: the type, number and interfacial polymerization condition of the interfacial polymeric monomer are controlled, so an anion exchange unit is perfectly matched with a cation exchange unit in the membrane; the selectivity of membrane is good; the membrane selection layer obtained via the interfacial polymerization is thin, and the membrane flux is relatively high; in addition, the preparation technology is simple. The membrane is capable of being used for separating low molecular weight organic matters from inorganic salts, particularly separating the low molecular weight organic matters from bivalent ions, such as Mg<2+> and SO4<2->.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a method for preparing a composite charged mosaic membrane by means of interfacial polymerization. Background technique [0002] In modern industrial production such as biochemistry, pharmaceuticals, dyes, etc., the practical problem of separating and removing trace electrolytes from water-soluble organic matter is often encountered. At present, in order to realize the separation of organic matter and inorganic salts, nanofiltration is widely used in industrial applications. For example, "Dyes and Dyeing" (2007, 44:8-10) reported that the microfiltration pretreatment process and nanofiltration desalination process of reactive red dye. After microfiltration pretreatment, use DK2540 spiral-wound nanofiltration membrane with a membrane area of ​​1.77m 2 . At 2.5MPa, the permeate flux of nanofiltration concentration and desalination is 2.6-3.3L min -1 range, the solid content o...

Claims

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Application Information

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IPC IPC(8): B01D69/12
Inventor 刘金盾张浩勤张景亚邓建绵张翔张延武张冰
Owner ZHENGZHOU UNIV
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