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 high production cost, unfavorable liquid penetration, low filtration efficiency, etc., and achieve low cost, simple and flexible process, and high porosity Effect

Active Publication Date: 2013-11-06
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, 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 slurry viscosity is between 10000 ~ 20000mPa·s; the raw material ratio 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 The glass template plate shown is scraped at a temperature of 30°C and a thickness of 3mm. The template plate is quickly immersed in water to cure for 0.5h, and dried after the phase inversion is complete to obtain a half-edge membrane with protrusions;

[0038] Prepare an aqueous solution of 8wt.% polyvinyl alcohol (PVA), take two identical half-edge films, pre-coat a layer of PVA solution on one side of the protruding part, and then stick them together and press them tightly...

Embodiment 2

[0044] The binder polysulfone (PSF) and solvent dimethylacetamide (DMAC) were dissolved by heating and stirring, and then ceramic powder yttria-stabilized zirconia (YSZ, particle size 0.2μm), dispersant PVP, and stirring ball milled for 24h were added. , vacuum defoaming for 6h to obtain slurry, the viscosity of the slurry is between 10000~20000mPa·s; the ratio of raw materials is m(PSF):m(DMAC):m(YSZ)=1:5:8, m(PVP): m(YSZ)=1:100.

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

[0046] Prepare 8 wt.% PVA aqueous solution, take two identical half-edge films, pre-coat a layer of PVA solution on one side of the protruding part, and then relatively adhere and press tightly, and...

Embodiment 3

[0050] Select polyethersulfone (PES) as binder, N-methylpyrrolidone (NMP) as solvent, polyvinylpyrrolidone (PVP) as dispersant, alumina (Al 2 O 3 , particle size 1 μm) and titanium oxide (TiO 2 , particle size 50nm) mixed uniformly in a mass ratio of 6:1 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, held for 3 hours, and heated to 1150°C at 2°C / min, held for 5 hours. Other conditions are the same as in Example 1. The ceramic flat membrane support prepared in this example has a porosity of 60%, an average pore diameter of 100 nm, a compressive strength of 22 MPa, and a pure water flux of 12 m under a pressure of 0.1 MPa. 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 and a preparation method thereof, in particular to a ceramic flat membrane support and a preparation method thereof. Background technique [0002] Membrane separation is a process of separating, purifying and concentrating different components of feed liquid by selective separation of membranes. During this process, no phase change occurs, so it has the characteristics of high efficiency and energy saving, and is widely used. 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, acid and alkali corrosion resistance, and have achieved good social and economic benefits. [0003] From...

Claims

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Application Information

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Patent Type & Authority Applications(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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