Pure silica zeolite membrane complex and preparation method thereof

A technology of zeolite membrane and complex, which is applied in the field of pure silica zeolite membrane complex and its preparation, can solve the problems that the surface of the carrier is difficult to completely cover the dense film layer, and the pure silica zeolite membrane cannot achieve gas separation, etc., to improve the resistance to mechanical vibration performance, improved thermal conductivity, and reduced usage

Inactive Publication Date: 2018-10-16
SHENZHEN JINGTE INTELLIGENT MFG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the pure silicalite membrane is prepared by conventional methods, when the thickness of the pure silicalite membrane is less than 1 μm, it is dif

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] In the preparation method of the pure silicalite membrane complex of the present invention, the steps are as follows:

[0022] S1: pre-treating the porous carrier;

[0023] S2: Coating silica sol on the surface of the porous carrier;

[0024] S3: Hydrothermal synthesis of zeolite membrane;

[0025] S4: Roasting at high temperature to remove the structure directing agent.

[0026] Specifically, a material with a porous structure is selected as a porous carrier, and the material of the porous structure can be alumina, zirconia or silicon oxide; preferably, the average pore diameter of the porous structure material is 50-1000nm, and the porosity is 35 -80%; In addition, the porous carrier is tubular or flat, and the thickness of the porous carrier is on the order of millimeters.

[0027] Firstly, pretreatment is performed on the porous carrier. The purpose of the pretreatment is to achieve the surface leveling and smoothing of the porous carrier while removing impuritie...

Embodiment 1

[0034] S1. Carrier pretreatment: Select tubular porous alumina with an average pore diameter of 500nm, a porosity of 45%, a diameter of 13mm, and a wall thickness of 1.5mm as the carrier; successively use 800# and 2000# sandpaper to carefully polish the surface of the carrier until it is smooth ; Then, under the assistance of ultrasound, treat in acetone for 5 minutes, and treat in deionized water for 10 minutes; finally, dry the carrier tube at 120° C. for later use.

[0035] S2. Coating silica sol: Prepare a silica sol solution with a mass concentration of 25%, and place it in a 500ml graduated cylinder; soak the above-mentioned treatment carrier in the silica sol solution, keep it for 30s, and dry it at 45°C for 10 minutes after taking it out; Repeat 3 times; finally dry at 150°C and set aside.

[0036] S3. Hydrothermal synthesis: prepare a tetrapropylammonium hydroxide solution with a mass concentration of 18%, take 160ml of the solution and add it to a stainless steel rea...

Embodiment 2

[0042] S1. Carrier pretreatment: select plate-shaped porous alumina with an average pore diameter of 1000nm, a porosity of 62%, and a thickness of 2.8mm as the carrier; successively use 1200# and 1800# sandpaper to carefully polish the surface of the carrier until it is smooth; then ultrasonically With the assistance, it was treated in acetone for 15 minutes and in deionized water for 20 minutes; finally, the carrier plate was dried at 160°C for later use.

[0043] S2. Coating silica sol: Prepare a silica sol solution with a mass concentration of 42%, and place it in a 500ml graduated cylinder; soak the above-mentioned treatment carrier in the silica sol solution, keep it for 20s, and dry it at 25°C for 30 minutes after taking it out; Repeat 2 times; finally dry at 140°C and set aside.

[0044] S3. Hydrothermal synthesis: prepare a tetrapropylammonium hydroxide solution with a mass concentration of 36%, take 160ml of the solution and add it to a stainless steel reactor with a ...

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Abstract

The invention discloses a pure silica zeolite membrane complex and a preparation method thereof. The pure silica zeolite membrane complex comprises a porous carrier and a pure silica zeolite membranecovering the surface of the porous carrier. The thickness of the pure silica zeolite membrane is micron-sized or sub-micron-sized; part of the pure silica zeolite membrane is embedded into the porouscarrier and is combined with the porous carrier to form an entirety. The pure silica zeolite film has ultra-thin thickness which is micron-sized or sub-micron-sized, so that the penetration resistanceof the pure silica zeolite membrane complex is greatly reduced and permeability flux of the pure silica zeolite membrane complex is increased. The pure silica zeolite membrane complex disclosed by the invention has a good gas separation effect; a separation effect index of the pure silica zeolite membrane complex on small molecule gas is 3x10<-5> to 3x10<-4>.

Description

technical field [0001] The invention relates to the field of zeolite separation membrane and its preparation, in particular to a pure silica zeolite membrane complex and its preparation method. Background technique [0002] Zeolite membrane is a kind of crystal with regular pore structure, which has high temperature resistance, chemical and biological corrosion resistance, high mechanical strength, and has good development prospects in separation and catalysis. As a zeolite membrane with a pore structure of about 0.5nm, the pore size of pure silicalite is close to the size of most gas molecules, which is very conducive to the separation of gas molecules, especially small molecular gases. [0003] Generally, when pure silicalite membranes are used for separation, the diffusion resistance of gas molecules in the pores inside the membrane is closely related to the thickness of the membrane and increases exponentially. In order to further improve the gas separation effect of th...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D71/02
CPCB01D53/228B01D71/02B01D71/028
Inventor 张惠宝赵忆娜
Owner SHENZHEN JINGTE INTELLIGENT MFG TECH CO LTD
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