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Hydrophobic inorganic porous membrane and preparation method thereof

An inorganic porous and hydrophobic technology, which can be used in separation methods, chemical instruments and methods, membrane technology, etc., and can solve problems such as sintering mismatch of inorganic materials.

Active Publication Date: 2015-08-26
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a kind of hydrophobic inorganic porous membrane in order to improve the deficiency of prior art, the purpose of the present invention also provides the preparation method of above-mentioned hydrophobic inorganic porous membrane, this hydrophobic inorganic porous membrane can be used for oily water (comprising emulsified oily water) ) system is separated, which solves the problem of sintering mismatch of inorganic materials, and the preparation process is simple, and the prepared hydrophobic membrane has high mechanical strength, good heat resistance, long service life, easy batch preparation, and overcomes the shortcomings in the prior art

Method used

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  • Hydrophobic inorganic porous membrane and preparation method thereof
  • Hydrophobic inorganic porous membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 70g of yttrium-stabilized zirconia (YSZ), add 3.5g of starch, and ball mill to obtain a support material powder. Weigh 15g of yttrium oxide, add 0.7g of starch, and then ball mill it evenly to obtain the film layer material powder. In addition, 0.15 g of yttrium oxide and 14.85 g of YSZ were weighed, 0.75 g of starch was added, and ball milled to obtain a transition layer material powder. The green body is made by tape casting, and the green body has a five-layer structure: yttrium oxide film layer, transition layer, YSZ support layer, transition layer, yttrium oxide film layer (the quality of each layer of yttrium oxide film layer is the same as that of each transition layer ,Such as figure 1 shown). It is then sintered in a high temperature furnace at 1100°C for 2 hours, and then cooled. When the temperature is higher than 600°C, the heating (or cooling) rate is 2.5°C / min; when the temperature is lower than 600°C, the heating (or cooling) rate is 4°C / min. Th...

Embodiment 2

[0027] Weighed 194g of zirconia, added 19.4g of polyvinyl alcohol (PVA, 10% by mass) and ball-milled to obtain support material powder. Weigh 2g of lanthanum oxide, add 0.2g of the above PVA, and then ball mill to obtain a film layer material powder. In addition, 2 g of zirconia and 2 g of lanthanum oxide were weighed, and 0.4 g of the above-mentioned PVA was added and ball-milled to obtain a transition layer material powder. The green body is made by slip casting method, and the green body has a five-layer structure: lanthanum oxide film layer, transition layer, zirconia support body layer, transition layer, lanthanum oxide film layer (each layer of lanthanum oxide film layer and the mass of each transition layer Same). Then sinter at 1200°C for 3 hours in a high-temperature furnace, and then cool to obtain a lanthanum oxide tubular film, wherein the temperature rise (or temperature drop) rate is 0.5°C / min when the temperature is higher than 600°C; Cooling) rate is 2.5°C / mi...

Embodiment 3

[0030] Weigh 80g of alumina, and ball mill it evenly to obtain support body material powder. Weigh 10 g of cerium oxide, and grind it evenly to obtain a film layer material powder. In addition, 4 g of cerium oxide and 6 g of aluminum oxide were weighed and ground uniformly to obtain transition layer material powder. The green body is made by extrusion molding, and the green body has a five-layer structure: a cerium oxide film layer, a transition layer, an alumina support layer, a transition layer, and a cerium oxide film layer. Then sinter in a high-temperature furnace at 1250°C for 2.5h, and then cool to obtain a cerium oxide tubular film, wherein the temperature rise (or temperature drop) rate is 1°C / min when the temperature is higher than 600°C; or cooling) at a rate of 2°C / min. Through the contact angle test, the result shows that the contact angle of the hydrophobic inorganic porous membrane to the water phase is 106°.

[0031] In this example: in the support body mate...

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Abstract

The invention relates to a hydrophobic inorganic porous membrane and a preparation method thereof. The hydrophobic inorganic porous membrane is characterized in that the hydrophobic inorganic porous membrane is composed of five layers, i.e., a support body, transition layers located at two sides of the support body and two outmost film layers; and material powders of one of the film layers, one of the transition layers, the support body, the other of the transition layers and the other of the film layers are successively placed in a die to prepare a five-layer green body and then high-temperature sintering and molding are carried out so as to obtain the hydrophobic inorganic porous membrane. The preparation method for the hydrophobic inorganic porous membrane is simple and has low preparation cost; the prepared hydrophobic inorganic porous membrane has resistance to organic solvents, high heat stability, high mechanical strength and long service cycle; and the multilayer structure can overcome the problem of unmatching between thermal expansion properties of a support body and a film layer in a conventional single-layer structure and enhances bonding between the support body and the film layers. The hydrophobic inorganic porous membrane prepared in the invention has a fast oil infiltration speed and is capable of giving priority to permeation of oil (including emulsified oil) during filtration of oil-water mixtures and oil-water emulsion (or emulsified oil-water).

Description

technical field [0001] The invention relates to a hydrophobic inorganic porous membrane used for oil-water (including emulsified oil-water) system separation and a preparation method thereof. Background technique [0002] With the development of industry, the discharge of oil and water produced in the process of industrial production is large, which seriously endangers the water environment and human health. Therefore, the oil-water system must be treated to remove the emulsified oil. In recent years, due to the advantages of good selectivity, strong adaptability, low energy consumption, large processing capacity, easy cleaning, and high mechanical strength, ceramic membranes have been widely used in separation, purification, and concentration. [0003] Because the surface of the traditional ceramic membrane contains hydroxyl groups, the surface exhibits hydrophilic properties. Although the ceramic membrane modified by surfactant (referring to patent CN102423641) can separa...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/02B01D69/10B01D67/00B01D17/022
Inventor 金万勤陈天瑀任小明
Owner NANJING UNIV OF TECH
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