Ceramic flat membrane supporting body and production method thereof

A flat membrane and support technology, applied in the field of ceramic flat membrane support and its preparation, can solve the problems of low filtration efficiency, unfavorable liquid penetration, high production cost, and achieve the effects of high porosity, simple and flexible process, and low cost

Active Publication Date: 2015-02-18
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Combining existing patents, literature research and market products, it can be found that there are two main configurations of plate ceramic membranes, a single flat membrane and a combination of two flat membranes. The latter is obviously more convenient to apply, and the product molding process is mainly molded. , extrusion molding and tape casting, the production cost is high, and the membranes in the supports obtained by these processes are all symmetrical membranes
The pore size is the same everywhere in the symmetrical membrane, and the pore distribution is uniform, which can meet the requirements of separation selectivity, but the resistance of the symmetrical membrane is the same everywhere, which is not conducive to liquid penetration and low filtration efficiency.

Method used

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  • Ceramic flat membrane supporting body and production method thereof
  • Ceramic flat membrane supporting body and production method thereof
  • Ceramic flat membrane supporting body and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The binder polyethersulfone (PES) and the solvent N-methylpyrrolidone (NMP) were stirred and dissolved at 70°C to obtain a transparent sol, and the dispersant polyvinylpyrrolidone (PVP) was added, and the ceramic powder Al 2 o 3 (particle size 0.5μm), stirring ball milling for 24 hours, vacuum defoaming for 2 hours to obtain a slurry, the viscosity of the slurry is between 10000 and 20000mPa s; the ratio of raw materials is m(PES):m(NMP):m(Al 2 o 3 )=1:4:6, m(PVP):m(Al 2 o 3 )=1:100;

[0037] use image 3 For the scraped film of the glass template plate shown, the temperature of the scraped film is 30°C, and the thickness of the scraped film is 3 mm. Quickly immerse the template plate in water for 0.5 hours to cure, and dry it after the phase inversion is complete to obtain a half-film with protrusions;

[0038] Prepare an aqueous solution of 8wt.% polyvinyl alcohol (PVA), take two identical halves of the film, pre-coat a layer of PVA solution on the side of the pr...

Embodiment 2

[0044] Dissolve the binder polysulfone (PSF) and the solvent dimethylacetamide (DMAC) with heating and stirring, then add ceramic powder yttria stabilized zirconia (YSZ, particle size 0.2 μm), dispersant PVP, and stir ball mill for 24 hours , Vacuum defoaming for 6 hours to obtain slurry, the viscosity of the slurry is between 10000 and 20000mPa s; the ratio of raw materials is m (PSF): m (DMAC): m (YSZ) = 1:5:8, m (PVP): m(YSZ)=1:100.

[0045] Use a silicone template plate to scrape the film, the temperature of the scraping film is 15°C, and the thickness of the scraping film is 5mm. After scraping the film, let it stand in the air for 3 minutes, quickly immerse the template plate in water for 2 hours, and dry it after the phase inversion is complete. Outer half membrane;

[0046] Prepare an 8wt.% PVA aqueous solution, take two identical half-membranes, pre-coat a layer of PVA solution on one side of the protruding part, stick them together and press them tightly, and then u...

Embodiment 3

[0050] Choose polyethersulfone (PES) as binder, N-methylpyrrolidone (NMP) as solvent, polyvinylpyrrolidone (PVP) as dispersant, alumina (Al 2 o 3 , particle size 1μm) and titanium oxide (TiO 2 , particle size 50nm) according to the mass ratio of 6:1 mixed evenly as a ceramic powder. m (PES): m (NMP): m (ceramic powder) = 1:5:6, m (PVP): m (ceramic powder) = 1:120.

[0051] When the green body is sintered, the temperature is raised to 450°C at 1°C / min, kept for 3 hours, raised to 1150°C at 2°C / min, kept for 5 hours, and other conditions are the same as in Example 1. The ceramic flat membrane support made in this embodiment has a porosity of 60%, an average pore diameter of 100nm, a compressive strength of 22MPa, and a pure water flux of 12m under a pressure of 0.1MPa. 3 / (m 2 h).

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Abstract

The invention discloses a ceramic flat membrane supporting body and a production method thereof. The ceramic flat membrane supporting body is formed by two layers of flat membranes, the left lateral wall, the right lateral wall and at least a supporting column; the two layers of flat membranes, the left lateral wall and the right lateral wall form into a flat-pipe-shaped structure; the supporting column is arranged between the two layers of flat membranes; the flat membranes which are in asymmetric structures comprise surface layers of sponge hole structures and internal layers of finger-shaped hole structures; separation selectivity, permeation flux and mechanical strength of the flat membranes are high. The production method of the ceramic flat membrane supporting body comprises preparing slurry, producing dies through a phase inversion method, forming through a die pressing method and sintering. The production technology is easy and flexible, the costs are low, the dies are cheap, the replacing is convenient, a plurality of assemblies in different sizes can be formed at one time, and the production efficiency is high.

Description

technical field [0001] The invention relates to a ceramic membrane support body and a preparation method thereof, in particular to a ceramic flat membrane support body and a preparation method thereof. Background technique [0002] Membrane separation is the process of separating, purifying and concentrating different components of feed liquid by selective separation of membranes. In this process, no phase change occurs, so it has the characteristics of high efficiency and energy saving, and its application is becoming more and more extensive. The separation membranes used in membrane separation technology can be roughly divided into organic membranes and inorganic membranes represented by ceramic membranes according to the materials used. Compared with organic membranes, ceramic membranes have achieved large-scale applications in many engineering fields due to their high temperature resistance, solvent resistance, and acid and alkali corrosion resistance, and have achieved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D69/06B01D67/00B01D71/02
Inventor 郭芳威陈顺权杜如虚其他发明人请求不公开姓名
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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