One-step preparation process for thin film composite membrane using dual (double layer)-slot coating technique

A separation membrane and thin film technology, applied in semi-permeable membrane separation, devices for coating liquid on the surface, membrane technology, etc., can solve the problems of increasing the risk of environmental pollution, increasing the cost of separation membrane preparation, and increasing the cost of preparation equipment, etc. Achieve the effect of saving the cost of preparation equipment, reducing the unit price of preparation, and saving the cost of the process

Active Publication Date: 2018-07-31
KOREA UNIV RES & BUSINESS FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the 2-step preparation process not only leads to an increase in the cost of preparation equipment, but also increases the preparation cost of the separation membrane due to the increase in preparation time, the complexity of the process, and the use of a large amount of solvent
Moreover, a relatively large amount of waste solvents and waste chemicals are released, increasing the risk of environmental pollution

Method used

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  • One-step preparation process for thin film composite membrane using dual (double layer)-slot coating technique
  • One-step preparation process for thin film composite membrane using dual (double layer)-slot coating technique
  • One-step preparation process for thin film composite membrane using dual (double layer)-slot coating technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] 1. Materials

[0059] (a) PAN porous support

[0060] As the porous support, a polyacrylonitrile (PAN) support with a pore size of about 20 nm was used. The support body was hydrolyzed in 2M NaOH aqueous solution at 40° C. for 90 minutes to enhance the hydrophilicity and negative charge characteristics of the support body surface. It acts to enhance the adhesion between the formed selective layer and the porous support.

[0061] (b) Organic monomers and solvents for interfacial polymerization

[0062] As the first organic monomer and the first solvent for dissolving it, m-phenylenediamine (m-phenylenediamine, MPD) and water were respectively prepared, and 0.025, 0.05, 0.1 and 2% MPD aqueous solutions (first solution ).

[0063] Also, trimesoyl chloride (TMC) and hexane (n-hexane) were used as the second organic monomer and the second solvent for dissolving them, respectively, and a 0.1% TMC solution (second solution) was prepared.

[0064] 2. Preparation of Thin Fi...

Embodiment 1

[0067] (2) Example 1. Thin film composite (TFC) separation membrane is prepared by a single-step preparation process (double (double layer)-slit coating technology)

[0068] The PAN support was fixed on the track, and a thin-film composite separation membrane was prepared using a double-slot mold. In the present invention, image 3 and Figure 4 The shape of the double-slot die is shown.

[0069] After putting the aqueous MPD solution (first solution) and the TMC solution (second solution) into the double-slot die, the flow rates of the aforementioned aqueous MPD solution and TMC solution were stabilized. After the flow is stabilized, the double-slot mold is moved along the track at a certain speed, and the two solutions are simultaneously coated on the PAN support to form a double-layer solution layer. At this point, the selective layer is synthesized by interfacial polymerization within the bilayer solution layer. After the selection layer was prepared, it was washed wit...

experiment example 1

[0076] 3. Experimental example 1. Performance test

[0077] Using the same PAN support for the TFC separation membrane prepared by the method of Comparative Example 1 (2-step process) and the method of Example 1 (single-step process), the concentration of MPD aqueous solution (0.025, 0.05, 0.1 and 2% ) related performance.

[0078] Specifically, using a cross-flow filtration (Cross-flow filtration) device under normal temperature (25 ° C) and high pressure (15.5 bar (bar)) conditions, make 2000ppm of NaCl aqueous solution permeate the TFC separation membrane and measure the water permeability ( Water penetration rate) and salt (NaCl) removal rate.

[0079] The water permeability is calculated based on the amount of water permeated per unit area and per unit time of the separation membrane, while the NaCl removal rate is calculated by measuring the salt content of the feed solution and the permeate solution.

[0080] Table 3 below describes the performance evaluation results....

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Abstract

The present invention relates to a preparation process for a thin film composite membrane (TFC, hereinafter TFC), and provides a method for preparing a membrane through a one-step process using a dual(double layer)-slot coating technique. In the dual (double layer)-slot coating process according to the present invention, a TFC membrane can be prepared by: forming a double-solution layer through aone-step process of performing simultaneous coating / contact of two immiscible solutions, in which two kinds of reactive organic monomers are dissolved, on a porous support; and synthesizing a selective layer through a crosslinking reaction between the organic monomers in an interface of the double layer.

Description

technical field [0001] The invention relates to a preparation process of a Thin Film Composite membrane (Thin Film Composite membrane, hereinafter referred to as TFC separation membrane) used as a core material in water treatment (sewage and wastewater treatment), seawater desalination or salinity power generation process. [0002] The national research and development project supporting this invention is a general researcher support project of the Ministry of Future Creation and Science. The research project number is No. 2015010143. Supported by Industry-University Cooperation Association. In addition, the national research and development project supporting this invention is the Ministry of Environment's ecological intelligent environmental protection water supply system development project, the research project number is No. 2016002100007, which is the development of membrane pollution control technology for high water purification treatment based on NF / LPRO membrane. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/06B01D61/02C02F1/44B01D69/10B01D67/00
CPCB01D69/10B01D69/12B01D69/105B01D2323/34B01D2323/42C02F1/444B05C9/06B01D67/0095B01D69/125B01D71/56B05C5/0254Y02A20/131B01D69/107B01D69/1214B01D69/1251C02F1/44B01D67/0006
Inventor 李政炫丁贤郁朴成晙安元基崔完硕李龙雨
Owner KOREA UNIV RES & BUSINESS FOUND
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