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Preparation and application of whisker-shaped ceramic membrane with low cost and high permeability

A high-permeability, ceramic membrane technology, used in semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., can solve problems such as high cost, nano-layer shedding, insufficient permeability, etc. The effect of hydrophilicity and high separation performance

Active Publication Date: 2021-07-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some advanced inorganic ceramic membranes currently used for oil-water separation have problems such as high cost, insufficient permeability and membrane fouling.
Therefore, some low-cost raw material substitutes have been gradually proposed; at the same time, many studies have enhanced water permeability by introducing pore-forming agents, but this often inevitably leads to the attenuation of other membrane properties such as mechanical strength and oil retention rate. ; In addition, by introducing some super-hydrophilic nano-layers on the surface of the membrane to enhance the surface hydrophilicity of the ceramic membrane, the oil pollution resistance of the membrane can be further improved, but there are also complex and cumbersome preparation processes and the shedding of the nano-layers. question
[0003] At present, most of the whisker-like mullite ceramic films will consider AlF 3 、MoO 3 , V 2 o 5 and Al(OH) 3 and other powders as additives, but AlF 3 Harmful gases (AlF 3 , AlOF and F), special care should be taken when using it, and a closed sintering environment is required to avoid its seepage, which is not suitable for making large-sized samples, so it is necessary to adopt a more economical and environmentally friendly film production method

Method used

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  • Preparation and application of whisker-shaped ceramic membrane with low cost and high permeability
  • Preparation and application of whisker-shaped ceramic membrane with low cost and high permeability
  • Preparation and application of whisker-shaped ceramic membrane with low cost and high permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: Preparation of whisker-like mullite ceramic film

[0042] (1) Handling of raw materials

[0043] The raw material powder of natural mineral bauxite and industrial waste fly ash is ball milled for 24-48 h, the particle size of the treated bauxite is mainly distributed in the range of 1.23-4.56 μm, and the average particle size (D50) is 2.9 μm; The particle size of fly ash is mainly distributed in the range of 0.69-5.20 μm, and the average particle size (D50) is 2.1 μm. The added tungsten oxide powder is used as a catalyst, dissolved in N-methylpyrrolidone (NMP) solvent as a polymer binder, and polyvinylpyrrolidone (PVP) is added as a dispersant to play the role of a uniform slurry.

[0044] (2) Preparation of casting solution

[0045] Weigh an appropriate amount of polyethersulfone (PES) and additive polyvinylpyrrolidone (PVP) and dissolve it in N-methylpyrrolidone (NMP) so that PES:NMP:PVP=8:32:1, and put it into the In the vinyl fluoride ball mill tank...

Embodiment 2

[0058] Example 2: Preparation of whisker-shaped ceramic membranes with low cost and high permeation flux by extrusion molding-high temperature sintering

[0059] The raw material powder of natural mineral bauxite and industrial waste fly ash is ball milled for 24-48 h, the particle size of the treated bauxite is mainly distributed in the range of 1.23-4.56 μm, and the average particle size (D50) is 2.9 μm; The particle size of fly ash is mainly distributed in the range of 0.69-5.20 μm, and the average particle size (D50) is 2.1 μm. Then the mixture of bauxite, fly ash and tungsten oxide powder (80 wt.%, of which tungsten oxide accounted for 20 wt.% of the powder), corn starch (10 wt.%), carboxymethyl cellulose (10wt. %) and other powders were fully and uniformly mixed and ball milled continuously for 10 h, and water was added according to the volume ratio of powder to water of 1.5:1 and then ball milled for 15 h to obtain a uniformly dispersed slurry. Then put the prepared sl...

Embodiment 3

[0060] Example 3: Application of Whisker Mullite Ceramic Membrane in Treatment of High Concentration Oil-Water Emulsion

[0061] At different feed oil concentrations (250mg·L -1 , 500 mg·L -1 and 1000 mg·L -1 ) under the conditions of oil-water emulsion separation experiments, and the rest of the operating conditions are moderate. The results show that when the transmembrane pressure difference is 0.15 bar, the oil concentration of the whisker-shaped ceramic membrane obtained by sintering at 1100°C in Example 1 is 250-1000mg L -1 The oil-water emulsion has a good treatment effect, its oil retention rate is high (95-99%), the permeation flux is stable, and the regeneration ability is strong. In the first 10 minutes of filtration, oil droplets quickly accumulated on the surface of the membrane, resulting in the formation of a fouling layer and a decrease in flux. As the run time increases, the flux decreases very slowly due to the increased dynamic stability of the fouling l...

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Abstract

The invention discloses preparation and application of a whisker-shaped ceramic membrane with low cost and high permeability, and belongs to the technical field of preparation of high-permeability membranes. According to the method, tungsten oxide is added to form thewhisker-shaped ceramic membrane; the ceramic membranehas lower mullite forming temperature, and the sintering cost is greatly reduced; higher porosity, higher mechanical strength and better mechanical strength are achieved, and the permeability is improved; and the surface is rougher, so that the wettability of the membrane is effectively enhanced, and the membrane has higher oil pollution resistance in the oil-water separation process. In the preparation process, a phase inversion method or an extrusion molding method is adopted, so that hollow fibrous, tubular or hollow flat-plate-shaped and large-size tubular or flat-plate-shaped whisker structure mullite ceramic membranes can be respectively obtained, and can be used for large-scale industrial application. The whisker-shaped mullite ceramic membrane shows stable high permeation flux and high oil retention rate for oil-water separation (such as high-concentration and high-acid-base environments and complex oily wastewater), and has a wide application prospect.

Description

technical field [0001] The invention relates to the preparation of a whisker-shaped ceramic membrane with low cost and high permeation flux and its water treatment application technology, and in particular provides a membrane preparation method that reduces the membrane preparation cost and increases permeability and anti-pollution performance. Whisker-shaped mullite ceramic membranes of various structures are prepared by phase inversion / extrusion molding-high temperature sintering in one step, including hollow fiber, tubular or hollow flat whisker-shaped mullite ceramic membranes, large-sized tubular or The slab-like whisker-structured mullite ceramic membrane can be further used for large-scale industrial applications. A stable mullite phase is formed at a lower sintering temperature, which greatly reduces the cost of film preparation. At the same time, due to the formed whisker interlocking structure and increased roughness, the membrane has higher permeability and oil pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/634C04B35/624B01D67/00B01D71/02
CPCC04B35/185C04B35/62218C04B35/62204C04B35/63488C04B35/63444C04B35/624B01D67/0048B01D71/024
Inventor 董应超武慧杨凤林孙春意
Owner DALIAN UNIV OF TECH
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