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Method for preparing nanofiltration/forward osmosis amphibious performance CTA membrane and apparatus thereof

A technology of forward osmosis and nanofiltration, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of imperfect forward osmosis membrane technology, and achieve environmental friendliness, simple preparation method, and mild reaction conditions Effect

Active Publication Date: 2017-11-24
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a new type of advanced drinking water treatment technology, forward osmosis membrane technology is not yet perfect. In order to finally obtain pure water from the draw solution, the forward osmosis process usually needs to be coupled with other pressure membrane processes.
At present, the application research on the coupling process of forward osmosis and other pressure membrane treatment technologies in the field of drinking water treatment is still mainly limited to the preliminary investigation of forward osmosis desalination of seawater, brackish water, and concentrated reverse osmosis water. It is necessary to propose a technical means to provide a method for preparing nanofiltration / forward osmosis amphibious CTA membrane to realize the coupling process of forward osmosis and nanofiltration

Method used

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  • Method for preparing nanofiltration/forward osmosis amphibious performance CTA membrane and apparatus thereof
  • Method for preparing nanofiltration/forward osmosis amphibious performance CTA membrane and apparatus thereof
  • Method for preparing nanofiltration/forward osmosis amphibious performance CTA membrane and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step (1), 13.0g cellulose triacetate and oil phase monomer mixture are dissolved in NMP solvent, make film-forming precursor solution;

[0055] The mass fraction of the oil phase monomer in the film-forming precursor solution is 0.1%;

[0056] In step (2), the casting solution is placed in a 60°C water bath, and after mechanical stirring for 12 hours, the casting solution is left to defoam in an oven at 60°C for 8 hours, and then cooled to room temperature;

[0057] Step (3), scrape the casting solution on a clean, dry, non-scratched glass plate, immerse in a solution with a m-phenylenediamine content of 0.1%, and form a film in the gel phase separation;

[0058] In step (4), the formed nascent film was immersed in a deionized water bath at 25° C. for 7 days, and the water was changed three times a day. The prepared membrane is placed in the air and dried naturally at room temperature to obtain a structurally regulated nanofiltration / forward osmosis amphibian CTA membr...

Embodiment 2

[0064] Step (1), 13.0g cellulose triacetate and oil phase monomer mixture are dissolved in NMP solvent, make film-forming precursor solution;

[0065] The mass fraction of the oil phase monomer in the above precursor solution is 0.1%;

[0066] In step (2), the casting solution is placed in a 60°C water bath, and after mechanical stirring for 12 hours, the casting solution is left to defoam in an oven at 60°C for 8 hours, and then cooled to room temperature;

[0067] Step (3), scrape the casting solution on a clean, dry, non-scratched glass plate, immerse in a solution with a m-phenylenediamine content of 0.2%, and form a film in the gel phase separation;

[0068] In step (4), the formed nascent film was immersed in a deionized water bath at 25° C. for 7 days, and the water was changed three times a day. The prepared membrane is placed in the air and dried naturally at room temperature to obtain a structurally regulated nanofiltration / forward osmosis amphibian CTA membrane.

...

Embodiment 3

[0073] Step (1), 13.0g cellulose triacetate and oil phase monomer mixture are dissolved in NMP solvent, make film-forming precursor solution;

[0074] The mass fraction of the oil phase monomer in the above precursor solution is 0.15%;

[0075] In step (2), the casting solution is placed in a 60°C water bath, and after mechanical stirring for 12 hours, the casting solution is left to defoam in an oven at 60°C for 8 hours, and then cooled to room temperature;

[0076] Step (3), scrape the casting solution on a clean, dry, non-scratched glass plate, immerse in a solution with a m-phenylenediamine content of 0.1%, and form a film in the gel phase separation;

[0077]In step (4), the formed nascent film was immersed in a deionized water bath at 25° C. for 7 days, and the water was changed three times a day. The prepared membrane is placed in the air and dried naturally at room temperature to obtain a structurally regulated nanofiltration / forward osmosis amphibian CTA membrane.

...

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Abstract

The invention discloses a method for preparing nanofiltration / forward osmosis amphibious performance CTA membrane and an apparatus thereof. The method comprises the following steps: 1) dissolving a mixture of cellulose triacetate and an oil-phase monomer in a N-methyl 2 pyrrolidone solvent to prepare a casting liquid precursor solution; 2) performing standing on the casting liquid precursor solution for defoaming, and cooling the casting liquid precursor solution to room temperature to obtain the casting liquid; 3) scraping the casting liquid on a clean and non-scratch plate, immersing the plate in a gel bath formed by using an in-situ interface polymerization reaction for gelling, and performing an in-situ interface polymerization reaction during a gelling process to prepare a primary membrane; and 4) transferring the primary membrane to a deionized water bath, immersing the primary membrane for a while, fully removing the solvent, and naturally drying the prepared membrane to obtain the high-performance nanofiltration / forward osmosis amphibious performance CTA membrane having the characteristics of uniform opening on a right side and compactness of a back side, and has a polyamide active separating layer capable of penetrating a whole membrane main body.

Description

technical field [0001] The present invention relates to a method and device for preparing nanofiltration / forward osmosis amphibious cellulose triacetate (CTA) membrane, in particular to a non-solvent-induced phase separation co-occurrence in-situ interfacial polymerization method for preparing nanofiltration / forward osmosis A method and a device for a forward osmosis amphibious CTA membrane. Background technique [0002] As we all know, effectively removing the solubility of dissolved organic compounds in drinking water and ensuring the safety of produced water is an important way to solve the crisis of water resources and alleviate the current water quality-type water shortage problem. Due to the characteristics of both reverse osmosis and ultrafiltration, nanofiltration can effectively remove dissolved organic matter, new organic pollutants and inorganic ions in water at the same time, and retain minerals that are beneficial to the human body. Therefore, the advanced trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D67/00
CPCB01D67/0011B01D71/16
Inventor 张平允王铮张东金磊姜蕾杨坤马艳
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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