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Modified cellulose acetate ultrafiltration membrane preparation method

A technology of cellulose acetate and ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult treatment, secondary pollution, high cost, etc., and achieve improved mechanical strength and easy cleaning , the effect of mild conditions

Inactive Publication Date: 2012-06-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Oily sewage is a serious source of environmental pollution. The oil in the water body will be emulsified into stable emulsified oil under the action of surfactants, and the oil droplets will stick to each other, making it difficult to handle.
Traditional treatment methods include flocculation, gravity separation or slag scraping, but these methods either add too much chemical reagents to cause secondary pollution, or consume too much energy and are expensive

Method used

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  • Modified cellulose acetate ultrafiltration membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 4.8 g of cellulose acetate bound to 54.5-56 wt% acetic acid and 35.2 g of N,N-dimethylformamide into a three-neck flask, stir and dissolve for 1 h at room temperature; weigh 0.048 g of polyethylene glycol Monomethyl ether-g-nano-silica, continue to stir at room temperature for 2 hours to a transparent and clear homogeneous casting solution; ultrasonically disperse for 1 to 2 hours, and let stand to remove the bubbles in the casting solution; take a clean ordinary glass Plate and film scraping machine, placed flat on the table, after scrubbing with absolute ethanol, cast the film casting solution on one end of the glass plate, pull the film scraping machine to the other end of the glass plate at a uniform speed, and scrape about 200 μm nascent eco-film; after scraping the nascent eco-film, place it in the air for 10-15 seconds and then immerse it for 25 o The deionized water in C was changed every 5 h; the modified cellulose acetate ultrafiltration membrane (membra...

Embodiment 2

[0021] Weigh 4.8 g of cellulose acetate with 54.5 to 56 wt% bound acetic acid and 35.2 g of N,N-dimethylformamide into a three-necked flask; stir and dissolve for 1 h at room temperature; weigh 0.096 g of polyethylene glycol Monomethyl ether-g-nano-silica, continue to stir at room temperature for 2 hours to a transparent and clear homogeneous casting solution; ultrasonically disperse for 1 to 2 hours, and let stand to remove the bubbles in the casting solution; take a clean ordinary glass Plate and film scraping machine, placed flat on the table, after scrubbing with absolute ethanol, cast the film casting solution on one end of the glass plate, pull the film scraping machine to the other end of the glass plate at a uniform speed, and scrape about 200 μm nascent eco-film; after scraping the nascent eco-film, place it in the air for 10-15 seconds and then immerse it for 25 o The deionized water in C was changed every 5 h; the modified cellulose acetate ultrafiltration membrane ...

Embodiment 3

[0023] Weigh 4.8g of cellulose acetate bound to 54.5-56 wt% acetic acid and 35.2g of N,N-dimethylformamide into a three-necked flask; stir and dissolve for 1 hour at room temperature; weigh 0.144g of polyethylene glycol Methyl ether-g-nano-silica, continue to stir at room temperature for 2 hours until a transparent and clear homogeneous casting solution; ultrasonically disperse for 1 to 2 hours, and let stand to remove the bubbles in the casting solution; take a clean ordinary glass plate, Lay the film scraping machine flat on the table, after scrubbing with absolute ethanol, cast the casting solution on one end of the glass plate, pull the film scraping machine to the other end of the glass plate at a uniform speed, and scrape about 200 μm on the glass plate The nascent eco-film; after the nascent eco-film is scraped, place it in the air for 10-15 seconds and then immerse it for 25 o The deionized water in C was changed every 5 h; the modified cellulose acetate ultrafiltratio...

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Abstract

The invention discloses a modified cellulose acetate ultrafiltration membrane preparation method, which selects nano-silicon dioxide modified by methoxy polyethylene glycol as an additive. The preparation method comprises the following steps: adding cellulose acetate into N,N-dimethyl formamide, stirring at room temperature until the cellulose acetate is dissolved completely to obtain a homogeneous cellulose acetate solution, adding nano-silicon dioxide graft-modified by methoxy polyethylene glycol, ultrasonically stirring, standing for defoaming to obtain a casting solution, pouring the casting solution onto a clean glass plate, scraping a nascent membrane with a scraper, placing in the air for 10 to 15 seconds, and soaking in deionized water with 25 DEG C for 6 hours to obtain the modified cellulose acetate ultrafiltration membrane. The preparation method provided by the invention has simple process, mild preparation condition and low cost. The prepared modified cellulose acetate ultrafiltration membrane has the advantages of high mechanical strength, high toughness, high contamination resistance, easy cleaning, large pure water flux, and high oil drop rejection rate, and can be used for processing emulsified oil wastewater.

Description

technical field [0001] The invention relates to a membrane material for treating oily sewage and a preparation method thereof, in particular to a preparation method of a modified cellulose acetate ultrafiltration membrane. Background technique [0002] Ultrafiltration is a new membrane technology for the separation of liquid mixtures, which selectively separates substances through the microporous structure on the membrane surface. When the liquid mixture flows through the surface of the membrane under a certain pressure, the small molecular substances pass through the membrane, and the macromolecular substances are intercepted, so that the concentration of macromolecules in the original solution gradually increases, thereby achieving the purpose of separating, concentrating and purifying large and small molecules. The ultrafiltration process is carried out at room temperature, does not undergo phase change, does not require heating or adding chemical reagents, has low energy...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00
Inventor 周建成王云周晓锋李乃旭周冰瑶
Owner SOUTHEAST UNIV