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Process for preparing L- molecular sieve membranes on different carriers

A technology of molecular sieves and carriers, which is applied in the field of preparing L molecular sieve membranes by uniformly coating seed crystals on carriers by baking, which can solve cumbersome operations, is not suitable for large-scale industrial applications, and cannot effectively obtain flat seed crystals Layer and other issues, to achieve the effect of good repeatability, easy operation, and short synthesis cycle

Inactive Publication Date: 2008-10-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of these methods cannot effectively obtain a flat and dense seed layer, and some operations are too cumbersome to be suitable for large-scale industrial applications.

Method used

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  • Process for preparing L- molecular sieve membranes on different carriers
  • Process for preparing L- molecular sieve membranes on different carriers
  • Process for preparing L- molecular sieve membranes on different carriers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of the L molecular sieve membrane with stainless steel metal mesh as carrier

[0029] 1. Preparation of molecular sieve seed crystals: 8.4g KOH was dissolved in 10g distilled water, after the dissolution was complete, 30.0g silica sol (SiO 2 mass content is 30%), and the resulting stirring is solution I; 3.0g KOH is dissolved in 9.5g distilled water, and then 1.17g Al(OH) is added thereto 3 , heated and stirred until Al(OH) 3 Dissolve completely and compensate for lost moisture after cooling. Add the obtained solution drop by drop to solution I under stirring condition, stir evenly and put it into a reaction kettle, crystallize at 170°C for 7 days, then centrifuge and rinse with distilled water, put it into a beaker directly without drying , which is the seed crystal emulsion;

[0030] 2. The treatment of the carrier and the introduction of the crystal seed: put the stainless steel metal mesh (stainless steel metal mesh, China Xinxiang N...

Embodiment 2

[0032] Embodiment 2: Preparation of L molecular sieve membrane with stainless steel mesh as carrier

[0033]The silicon source in the molecular sieve membrane synthesis solution was changed to white carbon black, the amount of which was 6.0 g, and the amount of water was 22.5 g, and the others were the same as in Example 1. The obtained film has good symbiosis, but the flatness is slightly reduced, and a small amount of miscellaneous crystals are formed. Its scanning electron microscope picture and X-ray diffraction picture are shown in figure 2 .

Embodiment 3

[0034] Embodiment 3: the preparation of the L molecular sieve membrane with ceramic sheet as carrier

[0035] Except that the carrier used is changed into a ceramic sheet, the others are the same as in Example 1. The resulting film is dense, without formation of miscellaneous crystals, and has a high degree of crystallinity. Its scanning electron microscope picture and X-ray diffraction picture are shown in image 3 .

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Abstract

The invention belongs to the field of inorganic membrane preparation, specifically relates to a method for preparing L-shaped molecular sieve membranes on a stainless steel metal mesh, a ceramic plate or a sheet glass carrier, and particularly relates to a method of evenly coating seed crystals on the carrier by baking so as to prepare the L-shaped molecular sieve membranes. The method comprises the steps of preparing the L-shaped molecular sieve seed crystal solution, subjecting the obtained seed crystals to centrifugal processing; using distilled water to wash the seed crystals to neutrality; coating the seed crystals in the state of emulsion on the washed surface of the carrier; baking the surface with an electric furnace to cause the emulsion to spread evenly and compactly over the surface of the carrier so as to obtain the carrier coated with the seed crystals; placing the carrier coated with the seed crystals in a synthetic fluid for crystallization at the temperature of 160 to 180 DEG C for 2 to 4 days; drying the obtained molecular sieve membranes in an oven at 80 to 120 DEG C after washing. The X-ray diffraction and scanning electronic microscope test on the synthesized L-shaped molecular sieve membranes show that a layer of continuous and compact L-shaped molecular sieve membranes grow on the surfaces of the seed crystals without mixed crystals and have the advantage of short period for the synthesis of the L-shaped molecular sieve membranes.

Description

technical field [0001] The invention belongs to the field of inorganic membrane preparation, and in particular relates to a method for preparing an L-type molecular sieve membrane on a stainless steel metal mesh, a ceramic sheet or a glass sheet carrier, in particular to a method for uniformly coating a seed crystal on a carrier by baking To prepare the method for L molecular sieve membrane. Background technique [0002] L-type molecular sieves have one-dimensional straight channels parallel to the C axis, and their pore diameters are It has high thermal stability, chemical stability and good ion exchange performance. The L-type molecular sieve is made into a membrane. It has application prospects in the fields of membrane separation, ion exchange, and host-guest materials. [0003] Zeolite molecular sieve membrane is a new type of inorganic membrane developed in the past ten years. Zeolite molecular sieve membrane has small pore size (generally less than 1nm) and uniform...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B37/00
Inventor 朱广山裘式纶张金磊
Owner JILIN UNIV
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