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Preparation method of super-hydrophilic ZSM-5 zeolite membrane

A technology of ZSM-5 and zeolite membrane, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve problems such as air pollution, organic template agent toxicity, and organic wastewater pollution, and achieve Solve the effect of uneven film formation

Inactive Publication Date: 2013-07-24
武汉智宏思博环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the molecular sieve membrane exhibits high performance after high-temperature calcination, due to the thermal stress caused by the difference in thermal expansion between the molecular sieve layer and the support and the change of the molecular sieve crystal lattice parameters after the template agent is removed, the molecular sieve membrane is easy to form cracks during calcination. Significantly reduces the separation performance of the membrane
At the same time, the toxicity of organic templates, high cost, pollution of organic wastewater, air pollution caused by thermal decomposition of organic matter, and coke deposition caused by incomplete decomposition have become obstacles restricting the industrial application of ZSM-5 molecular sieve membranes.

Method used

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  • Preparation method of super-hydrophilic ZSM-5 zeolite membrane
  • Preparation method of super-hydrophilic ZSM-5 zeolite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) α-Al with a length of 250mm, an outer diameter of 12mm, an average pore diameter of 2-3μm, and a porosity of 30-40% 2 o 3 The ceramic carrier tube (purchased from Nanjing University of Technology) was polished with 1200-mesh sandpaper, and then cleaned in an ultrasonic cleaner to obtain a clean and smooth carrier tube; the two ends of the carrier tube were sealed with polytetrafluoroethylene plugs, 180°C for 3h drying;

[0033] (2) The first hot coating: take 20g of ZSM-5 coarse seeds with an average particle size of 200μm (purchased from Tianjin Nanhua Catalyst Co., Ltd.) and dissolve them in 500mL of deionized water to prepare a coarse seed solution. Put the carrier tube into the coarse seed solution, take it out after 20s, then remove the polytetrafluoroethylene plug to release the water in the carrier tube, dry it at 80°C for 24 hours, and wipe off the excess seed crystals on the surface;

[0034] (3) The second hot coating: take 1g of ZSM-5 fine crystal seeds...

Embodiment 2

[0043] In this embodiment, the molar ratio of each substance in the synthetic mother liquor in Example 1 is adjusted to: Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O:NaF=3.10:1:11.02:800:10, raw material sources, synthesis conditions are the same as in Example 1. The isopropanol dehydration separation factor of the obtained ZSM-5 zeolite membrane was tested to be 6510.

Embodiment 3

[0045] In this embodiment, the molar ratio of each substance in the synthetic mother liquor in Example 1 is adjusted to: Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O:NaF=9.0:1:29.72:2900:30, raw material sources, synthesis conditions are the same as in Example 1. The isopropanol dehydration separation factor of the obtained ZSM-5 zeolite membrane was tested to be 8700.

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Abstract

The invention relates to a preparation method of a ZSM-5 zeolite membrane and in particular relates to a preparation method of a super-hydrophilic ZSM-5 zeolite membrane. The preparation method of the super-hydrophilic ZSM-5 zeolite membrane comprises the following steps of: pre-treating a carrier material; preparing a ZSM-5 coarse crystal seed solution and a ZSM-5 fine crystal seed solution; introducing coarse crystal seeds and fine crystal seeds on the carrier by carrying out a hot-coating process twice in sequence; adding a silicon source, an aluminum source, sodium hydroxide and sodium fluoride to deionized water for mixing and preparing into a mother solution and ageing the mother solution; filling the aged synthesized mother solution and the carrier material, which is introduced with the coarse crystal seeds and the fine crystal seeds, to a reaction kettle and carrying out rotary crystallization; and washing and drying to obtain the super-hydrophilic ZSM-5 zeolite membrane after the crystallization is finished. The preparation method of the super-hydrophilic ZSM-5 zeolite membrane can be used for preparing the super-hydrophilic ZSM-5 zeolite membrane without additionally adding a membrane organic board agent by combining crystal seed coating adopting the hot-coating process twice with continuous rotary crystallization, so that the problems that the formed membrane synthesized by adopting a static crystallization process is nonuniform, small in permeation flux and low in repeatability can be effectively solved.

Description

technical field [0001] The invention relates to the preparation of ZSM-5 zeolite membrane, in particular to a preparation method of superhydrophilic ZSM-5 zeolite membrane. Background technique [0002] Zeolite molecular sieve membrane is an excellent inorganic membrane material developed in the past ten years. It has unique properties, uniform pore size, cation exchange, Si / Al ratio can be adjusted, Si or Al atoms can be replaced by other atoms, high temperature resistance, Resistant to chemical solvents, with different acidity, hydrophilicity, hydrophobicity and catalytic performance, the pore size and pore size distribution can be adjusted, and it is an excellent porous membrane material to realize the catalytic reaction of the separation membrane at the molecular level. With the relatively perfect preparation technology of ZSM-5 molecular sieve membrane, it has become the most researched molecular sieve membrane. [0003] ZSM-5 zeolite membrane is a widely used medium-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 张彩虹
Owner 武汉智宏思博环保科技有限公司