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A kind of asymmetric ceramic separation membrane and preparation method thereof

A ceramic separation membrane and asymmetric technology, applied in the field of membrane separation, can solve the problems of increased material transport resistance, hindered material exchange, and easy densification in the porous support layer.

Active Publication Date: 2016-03-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing the asymmetric ceramic separation membrane, the interface between the asymmetric ceramic separation membrane and the coagulation bath will inevitably form a skin layer when the membrane body is solidified. The material exchange between the external environment and the finger-shaped pores in the porous support layer is prevented, resulting in an increase in the material transport resistance of the porous support layer and a small separation flux.

Method used

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  • A kind of asymmetric ceramic separation membrane and preparation method thereof
  • A kind of asymmetric ceramic separation membrane and preparation method thereof
  • A kind of asymmetric ceramic separation membrane and preparation method thereof

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preparation example Construction

[0044] The invention provides a method for preparing an asymmetric ceramic separation membrane, comprising the following steps:

[0045] a) mixing ceramic powder, N-methyl-2-pyrrolidone, polyethersulfone and polyvinylpyrrolidone to obtain a ceramic slurry;

[0046] mixing the sacrificial substance, N-methyl-2-pyrrolidone, polyethersulfone and polyvinylpyrrolidone to obtain a sacrificial slurry;

[0047] b) The ceramic slurry obtained in step a) is formed into a film to form a ceramic layer, and then the sacrificial slurry is placed on the ceramic layer to form a film to form a sacrificial layer, and the ceramic layer and the sacrificial layer form a wet film bring;

[0048] Or the sacrificial slurry obtained in step a) is formed into a film to form a sacrificial layer, and then the ceramic slurry is placed on the sacrificial layer to form a ceramic layer, and the ceramic layer and the sacrificial layer form a wet film bring;

[0049] c) inverting the wet film tape obtained in...

Embodiment 1

[0126] The present invention according to Figure 4 300g of alumina powder with a particle size of D50=0.8μm, 150g of N-methyl-2-pyrrolidone, 25g of polyethersulfone and 4.5g of polyvinylpyrrolidone were mixed and ball-milled for 48 hours to obtain a ceramic slurry;

[0127] 25g of graphite powder particle size D50=10.0μm, 70g of N-methyl-2-pyrrolidone, 9g of polyethersulfone and 1.5g of polyvinylpyrrolidone were mixed and ball milled for 48 hours to obtain graphite slurry;

[0128] Vacuum defoaming of the obtained ceramic slurry for 10 minutes and vacuum defoaming of the graphite slurry for 10 minutes;

[0129] The present invention adopts the double-layer flow casting method to form a film on a polyester film substrate coated with a silicone oil coating on the surface of the defoamed ceramic slurry and the defoamed graphite slurry to obtain a wet film tape, wherein the bottom layer is 2mm ceramic layer, the upper surface layer is 0.1mm graphite layer;

[0130]Place the wet...

Embodiment 2

[0136] The present invention according to La 0.8 Sr 0.2 MnO 3 The stoichiometric ratio of (LSM) accurately weighed lanthanum oxide, strontium carbonate, and manganese dioxide, mixed them with lanthanum oxide, strontium carbonate, and manganese dioxide, and ball-milled them in an ethanol medium for 24 hours to obtain a ball-milled product; after drying the obtained ball-milled product, Calcination reaction at 1050°C for 10 hours to obtain LSM powder with a particle size of D50=1.2 μm perovskite phase, which is used as an electronically conductive phase powder;

[0137] The ion-conducting phase adopts Zr with a particle size of D50=0.75 μm 0.84 Y 0.16 o 1.92 (YSZ) powder;

[0138] The above-mentioned LSM and YSZ powders were uniformly mixed in ethanol by ball milling for 24 hours in a mass ratio of 40:60, and dried to obtain LSM and YSZ mixed ceramic powders;

[0139] 400g of LSM and YSZ mixed ceramic powder obtained above, 120g of N-methyl-2-pyrrolidone, 18g of polyethers...

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Abstract

The invention provides an asymmetrical ceramic separation membrane. The asymmetrical ceramic separation membrane comprises a separation membrane layer and a porous support layer which is arranged on the separation membrane layer, wherein a finger-shaped hole is formed in the porous support layer; one end of the finger-shaped hole is opened, while the other end of the finger-shaped hole is closed by the separation membrane layer. According to the porous support layer of the asymmetrical ceramic separation membrane, one end of the finger-shaped hole is opened, so that resistance to gas or liquid flowing through the porous support layer is small, and the increase of a flux of the asymmetrical ceramic separation membrane is facilitated. Experiment results show that a pressure difference between two sides of the ceramic membrane is less than 0.39bar. An N2 permeation flux of the asymmetrical ceramic separation membrane provided by the invention is over 8 times greater than that of an asymmetrical ceramic separation membrane which is prepared by a method of adding a pore-forming agent. When YSZ-LSM (Yttria Stabilized Zirconia- Lanthanum-Strontium-Manganese) serves as the material of the ceramic separation membrane, an oxygen permeation flux of the asymmetrical ceramic separation membrane is over 5 times greater than that of the asymmetrical ceramic separation membrane which is prepared by the method of adding the pore-forming agent at a temperature of 900 DEG C.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an asymmetric ceramic separation membrane and a preparation method thereof. Background technique [0002] Ceramic separation membrane is a solid membrane with excellent chemical corrosion resistance, high temperature resistance, long life and other advantages, and has broad application prospects in energy, chemical, food, environment and other fields. According to the structure of the membrane, ceramic separation membranes are divided into symmetrical ceramic separation membranes and asymmetric ceramic separation membranes, wherein the asymmetric ceramic separation membranes include a porous support layer for support and a separation layer for filtration. The performance of asymmetric ceramic separation membranes depends not only on the thickness of the membrane layer, but also on the pore size and distribution of the porous support layer. [0003] The po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/10B01D67/00
Inventor 王智文蔺杰袁荣华任春雷黄华高建峰陈初升
Owner UNIV OF SCI & TECH OF CHINA