A kind of preparation method of zirconia ceramic ultrafiltration membrane

A technology of zirconia ceramics and ultrafiltration membranes, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of insufficient filtration accuracy, small permeation flux, and poor membrane strength, and achieve improved Production efficiency, high-precision filtration effect, effect of porosity increase

Active Publication Date: 2022-05-06
翁志龙
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Generally speaking, the current ceramic ultrafiltration membrane preparation technology has a wide pore size distribution in the direct hydrothermal method, and it is difficult to obtain products with consistent pore size and performance in industrial production. The overall filtration accuracy is not high enough. The sol-gel method The pore size distribution of the ceramic ultrafiltration membrane prepared by direct calcination is also relatively wide, and the strength of the membrane layer is poor. First, the zirconium sol is calcined into nano-zirconia, and then configured into a coating solution for sintering. Although the pore size is small and the pore size distribution is narrow, the water The permeation flux is small, and the energy consumption is large in industrial applications

Method used

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  • A kind of preparation method of zirconia ceramic ultrafiltration membrane
  • A kind of preparation method of zirconia ceramic ultrafiltration membrane

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Embodiment 1

[0031] Dissolve 58g zirconium oxychloride octahydrate in 192g water, raise the temperature to 70℃, add 7.5% aqueous ammonia solution with stirring until the PH rises to 8.5, and stir for 2h to form a white emulsion. Filter the white emulsion with a filter, add water and filter several times until the chloride ion concentration is lower than 10PPM. Then, add water to 200g of the precipitate after suction filtration, raise the temperature to 70℃ and stir, slowly add 6.4% nitric acid aqueous solution until the PH of the solution drops to 1.5, and keep stirring at 70℃ for 10 hours. Then take out the solution, add 120g of water, 10g of glycerin, 10g of polyethylene glycol 1000, 20g of 20% polyvinyl alcohol aqueous solution, stir well, and dip the solution on the 200nm ceramic filter membrane substrate. After that, the substrate is dried, put into a high-temperature reaction kettle, and nitric acid aqueous solution with PH of 2 is added into the reaction kettle to submerge the whole cer...

Embodiment 2

[0033] 50g of zirconium oxychloride octahydrate was dissolved in 192g of water, heated to 75℃ and stirred to add 7.2% aqueous ammonia solution until the PH rose to 8.2, and stirred for 2h to form a white emulsion. Filter the white emulsion with a filter, add water and filter several times until the chloride ion concentration is lower than 10PPM. Then, add water to 180g of the precipitate after suction filtration, raise the temperature to 70℃ and stir, slowly add 5% nitric acid aqueous solution until the PH of the solution drops to 0.5, and keep stirring at 75℃ for 10 hours. Then, take out the solution, add 120g of water, 12g of glycerin, 12g of polyethylene glycol 1000, 20g of 10% polyvinyl alcohol aqueous solution, stir well, and dip the solution on the 100nm ceramic filter membrane substrate. After that, the substrate is dried, put into a high-temperature reaction kettle, and the nitric acid aqueous solution with PH of 3 is added into the reaction kettle to submerge the whole ce...

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Abstract

The invention discloses a method for preparing a zirconia ceramic ultrafiltration membrane. The method is characterized in that: a sol-gel method is used to prepare a zirconia sol; Mix one or more of vinyl alcohol, methyl cellulose, and glycerin evenly to prepare a coating solution; impregnate the coating solution on the surface of the ceramic filter membrane substrate; dry the coated substrate, and then immerse it in a high-pressure reaction In the nitric acid aqueous solution with a pH of 1-3 in the kettle, a hydrothermal reaction is carried out at 180-220°C to form a ceramic ultrafiltration membrane with a uniform pore size of 10-20nm.

Description

Technical field [0001] The invention relates to a preparation method of zirconia ceramic ultrafiltration membrane, belonging to the field of porous ceramic preparation. technical background [0002] Ceramic membrane is an important technology for precise filtration and separation. Among them, 5-50nm ultrafiltration ceramic membranes are widely used in chlor-alkali industry, such as brine refining, amino acid fermentation broth filtration, plant extract clarification filtration, oily wastewater treatment, chemical wastewater filtration containing organic solvents and high suspended solids, and water reuse such as condensed water containing oil and rust. [0003] At present, there are many ceramic ultrafiltration membrane preparation technologies, including sol-gel method, particle sintering method, direct hydrothermal method, etc., which can prepare ceramic ultrafiltration membranes with certain industrial value. [0004] CN 105903351A discloses a ceramic ultrafiltration membrane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/14
CPCB01D71/024B01D67/0039B01D67/0048B01D67/0051B01D61/145
Inventor 翁志龙
Owner 翁志龙
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