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Method for synthesizing molecular sieve membrane

A molecular sieve and synthetic liquid technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in completely eliminating pore defects, reducing the separation performance of synthesized membranes, and inability to completely eliminate pore defects, etc. Low cost, favorable for large-scale production, uniform seed layer effect

Inactive Publication Date: 2011-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-scale production of supports, it is difficult to completely eliminate the pore defects on the surface, and the crystal coating method of wiping dry seed crystal powder cannot completely eliminate the existence of these pore defects, thus greatly reducing the separation performance of the synthesized membrane.

Method used

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  • Method for synthesizing molecular sieve membrane
  • Method for synthesizing molecular sieve membrane
  • Method for synthesizing molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step A. Configure seed slurry

[0030] Weigh 3.18 grams of sodium metaaluminate and dissolve it in 12.21 grams of deionized water, then weigh 9.38 grams of sodium metasilicate nonahydrate and 0.17 grams of sodium hydroxide and dissolve it in 18.1 grams of deionized water, and add the sodium metaaluminate aqueous solution dropwise to In the sodium metasilicate solution, fully stir the resulting mixed solution, the mixed solution is stirred and aged at room temperature for 1 day and then used as the sol of the seed crystal slurry for subsequent use, and its composition is Na 2 O: A1 2 o 3 : SiO 2 : H 2 O=3.4: 1: 2: 120. Take by weighing 0.5 gram of this sol and mix it with 0.78 gram of NaA molecular sieve crystals and 0.46 gram of water with a particle size of 1 μm to prepare a seed crystal slurry. The mass ratio of the seed crystal to the solid in the sol is 90:10, and the amount of water in the slurry is Quality is 50%;

[0031] Step B. Pre-coat the seed layer

...

Embodiment 2

[0036] Step A. Configure seed slurry

[0037] Weigh 3.18 grams of sodium metaaluminate and dissolve it in 8.25 grams of deionized water, then weigh 2.65 grams of sodium silicate and 0.33 grams of sodium hydroxide and dissolve it in 8.93 grams of deionized water, and add the sodium metaaluminate aqueous solution dropwise to the sodium silicate In the solution, the resulting mixed solution was fully stirred, and the mixed solution was stirred and aged at room temperature for 2 days and then used as the sol of the seed crystal slurry for subsequent use, and its composition was Na 2 O: A1 2 o 3 : SiO 2 : H 2 O=2: 1: 1.5: 60. Take by weighing 0.62 grams of this sol and mix it with 0.6 grams of NaA molecular sieve crystals with a particle size of 5um and 0.65 grams of water to prepare seed crystal slurry. The mass ratio of seed crystals to solids in the sol is 80:20, and the amount of water in the slurry is Quality is 60%;

[0038] Step B. Pre-Apply Seed Layer

[0039] With e...

Embodiment 3

[0043] Step A. Configure seed slurry

[0044] Weigh 3.18 grams of sodium metaaluminate and dissolve it in 19.8 grams of deionized water, then weigh 14.08 grams of sodium metasilicate nonahydrate and 0.99 grams of sodium hydroxide and dissolve it in 31.6 grams of deionized water, and add the sodium metaaluminate aqueous solution dropwise to In the sodium metasilicate solution, fully stir the resulting mixed solution, the mixed solution is stirred and aged at room temperature for 2 days and then used as the sol of the seed crystal slurry for subsequent use, and its composition is Na 2 O: A1 2 o 3 : SiO 2 : H 2 O=5: 1: 3: 200. Weigh 0.5 grams of the sol and mix it with 7.37 grams of NaA molecular sieve crystals with a particle size of 0.1um and 2.7 grams of water to prepare a seed crystal slurry. The mass ratio of the seed crystal to the solid in the sol is 99:1, and the water in the slurry The mass of 30%;

[0045] Step B. Pre-Apply Seed Layer

[0046] Same as Example 1, ...

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Abstract

The invention discloses a method for synthesizing a molecular sieve membrane, which adopts a mode of crystal seed coating by a crystal seed slurry coating method for the synthesis of the molecular sieve membrane. A sol with a composition similar to that of a synthetic fluid for synthesizing the molecular sieve membrane is prepared, and the sol is mixed with molecular sieve crystals and water according to a certain proportion to prepare a crystal seed slurry; a supporting body is soaked with water, and after the surface of the supporting body is dried in the air, the crystal seed slurry is coated on the surface; when the surface is almost dry, the coating is strickled and dried to obtain a supporting body with a crystal seed layer; finally the molecular sieve membrane is synthesized by a hydrothermal synthesis method. The crystal seed layer prepared by the invention can eliminate possible defects on the supporting body surface, is distributed uniformly, and is not easy to be erased from the supporting body surface, so the synthesized molecular sieve membrane has a continuous and dense surface, excellent separation performance, good repeatability, and is applicable to large-scale production.

Description

technical field [0001] The invention relates to a method for synthesizing molecular sieve membranes, in particular to a method for synthesizing molecular sieve membranes after the wetting of a support body and the method of wiping and coating seed crystal slurry in combination with seed crystal coating. Background technique [0002] Molecular sieve is a microporous inorganic crystal material formed with silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron as the basic skeleton. Molecular sieves have the following advantages as inorganic membrane materials: 1) Molecular sieves have standardized and neat pores with a single pore size distribution; and the pore size of molecular sieves is similar to that of many important industrial raw materials. Molecules can be obtained by molecular sieving or shape-selective diffusion. separate. 2) Molecular sieves have good chemical stability and thermal stability. 3) The diversity of molecular sieve structures leads to the diversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C01B39/02
Inventor 王正宝葛琴琴邵佳刘春杰
Owner ZHEJIANG UNIV
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