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Method for preparing cellulose composite sodium filter membrane

A composite nanofiltration membrane, cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. big effect

Inactive Publication Date: 2010-11-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Cellulose is known to be insoluble in common solvents, limiting its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a preparation method of a cellulose composite nanofiltration membrane, which consists of four steps, and the specific implementation of each step is as follows:

[0022] 1) Add 1.0-20.0% by mass of cellulose or its derivatives and 60.0-99.0% by mass of ionic liquid into a high-temperature-resistant container, heat to 80-150°C under argon protection, and mechanically stir Dissolve evenly to obtain a film-making solution;

[0023] Optimum conditions: the mass fraction of cellulose is 4% to 12%, and the heating temperature is 80 to 120°C.

[0024] 2) Using a scraper to evenly scrape and coat the film-making solution on the non-woven support, the thickness of the film-making solution layer is 50-300 microns;

[0025] Best conditions: Coating thickness: 100-200 microns.

[0026] 3) exposing the non-woven fabric coated with the film-forming solution to the air for 5-80 seconds, and then immersing it in a coagulation bath with a temperature of 0-60° C....

Embodiment 1

[0033] The ionic liquid 1-allyl-3-methylimidazolium chloride salt ([AMIM]Cl) with a mass percentage of 1% of cellulose (a-cellulose) with a mass percentage of 98% is added to a high-temperature resistant container, Under the protection of argon, the temperature was raised to 80°C, and the cellulose was fully dissolved and uniform under mechanical stirring to obtain a clear coating solution; the cellulose coating solution was evenly coated on the polypropylene (PP) non-woven fabric, and the coating thickness 300 microns; the air exposure time is 20 seconds, and then immersed in a coagulation bath at 10°C, the coagulation bath is deionized water, and the coated cellulose solution is coagulated to obtain a cellulose composite film; the cellulose composite film is dried in the shade, soaked In the n-hexane solution of trimesoyl chloride with a mass fraction of 0.1%, take it out after 5 minutes; then place the membrane in an oven at 60° C. for 10 minutes to obtain a cellulose compos...

Embodiment 2

[0035]The ionic liquid 1 allyl-3-methylimidazolium chloride ([AMIM]Cl) with a mass percentage of 4% cellulose (a-cellulose) and a mass percentage of 96% is added to a high-temperature resistant container, Under the protection of argon, the temperature was raised to 80°C, and the cellulose was fully dissolved and uniform under mechanical stirring to obtain a clear coating solution; the cellulose coating solution was evenly coated on the polyester (PET) non-woven fabric, and the coating thickness 150 microns; the air exposure time is 10 seconds, and then immersed in a coagulation bath at 15°C, the coagulation bath is deionized water, and the coated cellulose solution is coagulated to obtain a cellulose composite film; the cellulose composite film is dried in the shade, soaked In the n-hexane solution of succinic anhydride with a mass fraction of 1%, take it out after 10 minutes; then place the membrane in an oven at 70° C. for 20 minutes to obtain a cellulose composite nanofiltra...

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Abstract

The invention discloses a method for preparing a cellulose composite sodium filter membrane, which comprises the following steps of: (1) dissolving cellulose or cellulose derivates into ionic liquid under a heating condition to obtain solution for preparing the membrane; (2) uniformly coating the solution for preparing the membrane on a non-woven fabric support and then soaking the support into a coagulating bath for coagulation to obtain a cellulose composite membrane; and (3) placing the obtained cellulose composite membrane into the solution of polyacid, poly-acyl chloride or poly-anhydride to perform crosslinking to prepare the cellulose composite sodium filter membrane. In the invention, the ionic liquid has high cellulose and cellulose derivates dissolving capability is used as the membrane-preparing solvent, so the membrane formation performance is high; and the ionic liquid can be recycled and repeatedly used. The crosslinked cellulose selective zone has high hydrophilism and selectivity, and the composite sodium filter membrane has a high flux and a high rejection ratio and can be widely applied in the separation and concentration of dyes, neutral particles, medicaments, food additives and the like.

Description

technical field [0001] The invention relates to a preparation technology of a nanofiltration membrane material, and specifically provides a preparation method of a cellulose composite nanofiltration membrane. Background technique [0002] Nanofiltration membrane is a new type of pressure-driven membrane developed in the past ten years, whose flux and separation effect are between ultrafiltration membrane and reverse osmosis membrane. Its appearance has greatly promoted the development of membrane technology and related fields. . Nanofiltration membrane modules have made rapid progress in the mid-1980s and have been industrialized. They have been widely used in petrochemical, biochemical, pharmaceutical, food, papermaking, textile, printing and dyeing, and water treatment. For the research of nanofiltration membrane, our country started relatively late, starting in the late 1980s. Although the number of research units is increasing, most of them are in the laboratory stage....

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D69/12
Inventor 徐又一李小林朱利平程梁朱宝库
Owner ZHEJIANG UNIV
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