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A kind of superhydrophilic and underwater superoleophobic oil-water separation mesh and preparation method thereof

An oil-water separation mesh membrane, underwater superoleophobic technology, applied in separation methods, chemical instruments and methods, immiscible liquid separation, etc. , to achieve the effect of improving pore permeability and oil-water separation effect, easy to obtain raw material sources, and abundant raw material sources

Active Publication Date: 2018-04-03
SHANGHAI SUPEREL ADVANCED MATERIAL SCI & TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The Chinese patent application with the application number 201010531517.5 discloses an oil-water separation net with underwater super-oleophobic properties. This technology has a certain effect of oil-water separation, but the preparation requires light-induced polymerization, and the process is relatively complicated.
The Chinese patent application whose publication number is CN102716676A discloses a method for preparing an oil-water separation net with underwater superoleophobic properties using chitosan as a raw material. The film-forming material used in this patent is a polymer with certain water solubility, resulting in The omentum has poor water resistance, which affects its service life
Chinese patent applications with application numbers 201110260766.X and 201310224027.4 report an oil-water separator with superhydrophilicity and underwater superoleophobicity, but its preparation process is complicated and the device is too cumbersome, which limits its large-scale practical application

Method used

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preparation example Construction

[0019] The superhydrophilic and underwater superoleophobic oil-water separation omentum preparation method that the present invention proposes comprises the following steps:

[0020] (1) prepare the dispersion liquid of nanofiber, wherein the first preparation process is as follows:

[0021] (1-1) Sodium hydroxide and urea are mixed, the mass percent of mixing is: Sodium hydroxide: urea=1: (0.5~2), add deionized water in the mixture, obtain sodium hydroxide in the solvent and account for the total solution The first solution with a mass percentage of 4-8%;

[0022] (1-2) Add commercial plant cellulose to the above-mentioned first solution under the condition of mechanical stirring, the mass percentage added is: plant cellulose powder: first solution = 1: (25~100), to obtain a mixed solution ; place the mixed solution at a temperature of 0 to -20 degrees Celsius for 3 to 8 hours, take it out at normal temperature and pressure, and stir for 15 to 30 minutes to obtain a second s...

Embodiment 1

[0032] (1) Add 3.8 grams of sodium hydroxide, 5.5 grams of urea and 40.8 milliliters of deionized water into a 250 milliliter beaker, stir well and place in a refrigerator at a constant temperature of minus 12.3 degrees Celsius for 5 hours. Then add 1 gram of cellulose powder to the above-mentioned lye, and stir for 20 minutes at 25 degrees Celsius to obtain a transparent cellulose lye. Use an equal volume of absolute ethanol to replace the transparent cellulose lye with a solvent. After standing for 30 minutes, the nanofibers of cellulose are precipitated in the alcohol solution, and then washed 3 times with an equal volume of deionized water and the added deionized water is controlled. The amount of water is used to obtain a dispersion of nanofibers with a solid mass fraction of 1%.

[0033] (2) 300 mesh nylon fabric nets and 100 mesh stainless steel nets were respectively immersed in absolute ethanol, cleaned in an ultrasonic cleaner for 5 minutes and then dried at room tem...

Embodiment 2

[0037] (1) Inoculate the seed culture solution of the pre-cultivated Acetobacter xylinum bacterial classification in 12 liters of Acetobacter xylinum fermentation broth with an inoculum size of 10%, shake fully, and cultivate it in a constant temperature incubator at 30 degrees Celsius for 15 days to obtain cellulose hydrogels. Wherein the Acetobacter xylinum fermentation broth contains 2% of glucose, 0.5% of peptone, 0.5% of yeast powder, 0.27% of disodium hydrogen phosphate pentahydrate, 0.115% of citric acid-hydrate with a mass concentration of 2.5 g / L, and a pH of 6. And sterilized at 121 degrees Celsius for 20 minutes. The cellulose hydrogel fermented by microorganisms was placed in 5% NaOH aqueous solution at 90 degrees Celsius for 10 hours, and then placed in deionized water at 85 degrees Celsius for 15 hours, during which the deionized water was replaced 3 times. Add 40 milliliters of deionized water and 20 milliliters of concentrated sulfuric acid into a three-neck f...

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Abstract

The invention relates to a super hydrophilic and underwater super oleophobic oil-water separation screen film and a production method thereof, and belongs to the technical field of oil-water separation in the petroleum industry. Hydrophilic cellulose nano-fibers are placed between two layers of a 100-400 mesh fabric net through a suction filtration or coating process to obtain the oil-water separation screen film with super hydrophilic and underwater super oleophobic properties. The contact angle between water and the surface of every hydrophilic cellulose nano-fiber layer in the separation screen film is approximately equal to 0DEG, and the contact angle between oil drops and the surface of every hydrophilic cellulose nano-fiber layer in the separation screen film is approximately equal to 150DEG. The separation screen film has the advantages of high pore space permeability, good oil-water separation effect, stable separation performance and degradability, and the production method has the advantages of simple process, abundant sources and easy obtaining of raw materials, low cost and environmental protection. The oil-water separation screen film produced through the method can be used to treat oil-containing wastewater discharged in the industry of petroleum exploitation, pipeline leakage, offshore transportation, weaving, food processing, machinery or chemical engineering.

Description

technical field [0001] The invention relates to a superhydrophilic and underwater superoleophobic oil-water separation mesh and a preparation method thereof, belonging to the technical field of oil-water separation in the petroleum industry. Background technique [0002] The oily wastewater generated in oil extraction, pipeline leakage, marine transportation and textile industry, as well as the large amount of oily wastewater discharged in food processing, machinery industry and chemical industry will have a very harmful impact on human beings and the natural environment. In addition, with the depletion of fossil resources, the reuse of waste oil has been paid more and more attention. Therefore, it is urgent to develop suitable equipment and methods to realize the simple and efficient recovery and utilization of oil in waste liquid, so as to reduce the harm of waste liquid and realize efficient utilization of energy. A suitable way to simultaneously achieve the above two go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/022C02F1/40
CPCB01D17/02C02F1/40
Inventor 向军辉付蕊赛华征张复实
Owner SHANGHAI SUPEREL ADVANCED MATERIAL SCI & TECH CO LTD
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