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Method for preparing anti-polluting oil-water separation ultra-filtration membrane

A technology of oil-water separation and ultrafiltration membrane, which is applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc. It can solve the problems of fast attenuation of oil droplets and achieve excellent anti-oil pollution performance, simple preparation process and high oil droplet retention rate.

Active Publication Date: 2011-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrophobic membranes have high mechanical strength, are less affected by surfactants, have lower energy consumption than hydrophilic membranes, and have higher initial flux, which is conducive to oil-water separation. However, due to the poor hydrophilicity of hydrophobic membrane materials, effective The "hydration layer" that prevents the oil droplets from reaching the membrane surface causes a large amount of oil droplets and other impurities to be adsorbed on the membrane surface. The membrane is seriously polluted, the flux decays quickly, and the membrane is difficult to clean.
The other type is hydrophilic membrane materials, such as cellulose and its various derivatives, polyvinyl alcohol, etc. Although good hydrophilicity is conducive to reducing membrane fouling during operation, on the other hand, the hydrophilicity is too high , the film is easy to dissolve, and the interdiffusion between solvent and non-solvent in the phase inversion process will be reduced during the film formation process, resulting in too thick a film skin layer, low porosity, and extremely low flux, which is not suitable for practical industrial applications

Method used

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  • Method for preparing anti-polluting oil-water separation ultra-filtration membrane

Examples

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Effect test

Embodiment 1

[0015] Weigh 3.2g of CA and 10.8g of solvent N, N-dimethylformamide into a three-necked flask, put it in a 60°C water bath at 900r / min and stir to dissolve for 1h, then weigh 6.0g of ethyl orthosilicate, Stir at 60°C for 5 hours to obtain a transparent and clear homogeneous casting solution; after stirring evenly, let the casting solution stand at 60°C for 5-7 hours to remove the bubbles in the casting solution; take a clean ordinary glass plate, homemade Put the scraper flat on the table. After scrubbing with absolute ethanol, take out the casting solution from the constant temperature bath. After the casting solution is completely cooled to room temperature, cast the casting solution on one end of the glass plate, and pull the scraper at a constant speed. To the other end of the glass plate, scrape out a nascent film with a thickness of about 240 μm on the glass plate; after scraping the nascent film, place it in the air for 10-30 seconds and then immerse it in a gel bath at ...

Embodiment 2

[0018] Weigh 3.2g of CA and 10.8g of solvent N, N-dimethylformamide into a three-necked flask, put it in a 60°C water bath at 900r / min and stir to dissolve for 1h, then weigh 6.0g of ethyl orthosilicate, Stir at 60°C for 5 hours to obtain a transparent and clear homogeneous casting solution; after stirring evenly, let the casting solution stand at 60°C for 5-7 hours to remove the bubbles in the casting solution; take a clean ordinary glass plate, homemade Put the scraper flat on the table. After scrubbing with absolute ethanol, take out the casting solution from the constant temperature bath. After the casting solution is completely cooled to room temperature, cast the casting solution on one end of the glass plate, and pull the scraper at a constant speed. To the other end of the glass plate, scrape out a nascent film with a thickness of about 240 μm on the glass plate; after scraping the nascent film, place it in the air for 10-30 seconds and then immerse it in a gel bath at ...

Embodiment 3

[0021] Weigh 3.2g of CA and 12.8g of solvent N, N-dimethylformamide into a three-necked flask, put it in a 60°C water bath at 900r / min and stir to dissolve for 1h, then weigh 4.0g of ethyl orthosilicate, Stir at 60°C for 5 hours to obtain a transparent and clear homogeneous casting solution; after stirring evenly, let the casting solution stand at 60°C for 5-7 hours to remove the bubbles in the casting solution; take a clean ordinary glass plate, homemade Put the scraper flat on the table. After scrubbing with absolute ethanol, take out the casting solution from the constant temperature bath. After the casting solution is completely cooled to room temperature, cast the casting solution on one end of the glass plate, and pull the scraper at a constant speed. To the other end of the glass plate, scrape out a nascent film with a thickness of about 240 μm on the glass plate; after scraping the nascent film, place it in the air for 10-30 seconds and then immerse it in a gel bath at ...

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Abstract

The invention discloses a method for preparing an anti-polluting efficient oil-water separation ultra-filtration membrane, which comprises the following steps of: dissolving 16.0 mass percent of cellulose acetate into an N,N-dimethyl formamide solvent based on 100 percent of the mass of membrane casting solution, adding 15.0 to 30.0 mass percent of ethyl orthosilicate, and scraping a nascent state membrane with thickness of 240 microns on a glass plate; placing the nascent state membrane in the air for 10 to 30 seconds, and then soaking the nascent state membrane into gel baths of 25 DEG C, wherein the gel baths are aqueous solution of hydrochloric acid and aqueous solution of sodium hydroxide respectively; and taking out the membrane from the gel bath, placing the membrane into deionizedwater, and changing the water once every 5 hours to obtain the CA(TEOS)-HCl and CA(TEOS)-NaOH modified ultra-filtration membrane. The method is simple in process and mild in conditions; and the flux of the modified membrane is greatly improved, good anti-polluting performance is kept, and the modified membrane has high interception rate and can be used for treating oil-containing wastewater.

Description

technical field [0001] The invention relates to a preparation method of an anti-pollution oil-water separation ultrafiltration membrane. It belongs to ultrafiltration membrane preparation technology. Background technique [0002] The treatment of oily wastewater has increasingly become a worldwide environmental problem. Oily wastewater has a wide range of sources and complex components. According to statistics, the wastewater discharged from oil fields, refineries and petrochemical plants around the world contains about 300,000 tons of crude oil and its products every year. Industrial waste engine oil and automobile waste oil total about 1.3 million tons. The oil discharged into the ocean with these waste waters in the world can reach 1 million tons every year. Oily wastewater mainly includes five categories: slick oil, dispersed oil, emulsified oil, dissolved oil and oil-solids. [0003] As a new high-efficiency platform technology, membrane technology has played an im...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00C02F1/44
Inventor 吕慧姜忠义苏延磊陈文娟石卿
Owner PETROCHINA CO LTD
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