Method for preparing highly-acidproof mordenite molecular sieve membrane

A technology of mordenite and molecular sieve, which is applied in the direction of mordenite crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve the effects of simple synthesis device, good separation performance and broad application prospects

Inactive Publication Date: 2008-10-29
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Summarize the existing research literature on the synthesis and characterization of mordenite membranes. At present, most of them still synthesize mordenite membranes by add

Method used

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  • Method for preparing highly-acidproof mordenite molecular sieve membrane
  • Method for preparing highly-acidproof mordenite molecular sieve membrane
  • Method for preparing highly-acidproof mordenite molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add a certain amount of sodium aluminate solid into a beaker filled with a certain amount of water, and stir until it dissolves to form solution A. Take another certain amount of NaOH solid and dissolve it in a certain amount of water, stir until dissolved, then pour it into a beaker containing a certain amount of white carbon black solid, stir, add the remaining water, and stir for 20 minutes to form solution B. Then transfer solution A to a plastic bottle, inject solution B into the plastic bottle with stirring, and stir for 2 hours. Then the reaction mixture was transferred into a mullite reactor, and crystallized at a constant temperature of 170°C for 24h. Cool, filter with suction, wash, and dry the recovered product at 100°C for 12 hours. A solid product was obtained.

[0043] The reaction mixture molar ratio is:

[0044] SiO 2 / Al 2 o 3 =30,Na 2 O / SiO 2 =0.2,H 2 O / Na 2 O=130

[0045] The solid powder product is analyzed by X-diffraction, and the result...

Embodiment 2

[0047] The support body adopts tubular mullite produced by Japan Nikkato Co., Ltd. (the composition of mullite is 67wt.%Al 2 o 3 and 33wt.% SiO 2 ). The support body is polished with 800-mesh sandpaper and ultrasonically cleaned, and then dried after ultrasonic cleaning and other pretreatments. A thin layer of MOR molecular sieve powder is coated on the surface of the support body, and the loading density of the seed crystal is 0.5-2mg / cm 2 , and the pre-seeded support was air-dried at 20°C for later use.

[0048] Silica sol (SiO 2 ·nH 2 O), aluminum isopropoxide (Al(OC 3 h 7 ) 3 ) is silicon, aluminum source raw material, and sodium hydroxide is as alkali raw material, and preparation raw material liquid is SiO with molar ratio 2 / Al 2 o 3 =25,Na 2 O / SiO 2 =0.33,H 2 O / Na 2 O=150 mixed, vigorously stirred for 5h to form a stable sol. The configured sol is poured into a stainless steel reaction kettle, and the support body pre-coated with MOR molecular sieve seed...

Embodiment 3

[0058] Synthesis ratio and preparation steps are the same as in Example 2. The difference is that the crystallization time is extended to 25h. The pervaporation performance of the synthesized membrane was investigated in a water / ethanol (10 / 90wt.%) system at 75°C after cleaning. The results are shown in Table 1.

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Abstract

The invention provides a preparation method for mordenite zeolite molecular sieve membranes with high acid resistance. The method directly synthesizes mordenite crystals, and then takes the crystals as crystal seeds, and takes silica sol and aluminum isopropoxide as the source of silicon and aluminum to synthesize dense mordenite zeolite molecular sieve membranes on a porous carrier. The method adopts a tubular support body made of various materials and prepares the mordenite zeolite membranes on a mullite support body. The flux of the membranes prepared on a stainless steel support body is twice higher than that of the membranes prepared on the mullite support body. The synthesized membranes show better stability in the studied acidic media under the different acidity conditions of organic acid and inorganic acid. The method can be widely applied to the pervaporation separation process of an acid system and a reactor for pervaporation membranes.

Description

technical field [0001] The invention provides a preparation method for synthesizing a highly acid-resistant pervaporation water-permeable membrane with self-made mordenite as a crystal seed, belonging to the field of permeation and separation of inorganic materials. Background technique [0002] Mordenite has elliptical channels parallel to each other, and its pore size is 0.69×0.58nm. The ideal unit cell composition is: Na[(AlO 2 ) 8 ·(SiO 2 ) 40 ]·24H 2 O. Mordenite is widely used as catalyst and adsorbent due to its high thermal stability and excellent acid resistance. The dense mordenite crystal layer (mordenite membrane) formed on the porous substrate will show broad prospects in the fields of organic mixture separation, membrane catalytic reaction and acid medium pervaporation liquid separation. [0003] In terms of the synthesis of mordenite, Barrer et al. (Synthesis and Reactions of Mordenite [J]. J Chem Soc, 1948, 127, 2158-2163) first reported. Bajpai et al....

Claims

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Application Information

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IPC IPC(8): C01B39/26
Inventor 陈祥树周荣飞李军袁慧胡中丽
Owner JIANGXI NORMAL UNIV
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