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Method for synthesizing NaA zeolite membrane

A molecular sieve and seed crystal technology, which is applied in the field of molecular sieve membrane synthesis, can solve the problems such as the inability to eliminate large pore defects on the surface of the support body and the complicated operation, and achieves the advantages of large-scale preparation, high permeation flux, and synthesis. low cost effect

Active Publication Date: 2009-03-11
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the methods of pre-coating seed crystals currently used include dipping crystal coating method, wiping coating crystal coating method, spray coating crystal coating method, vacuum coating crystal coating method and electrostatic attraction coating crystal crystal coating method. These seed crystal coating methods have their own advantages and disadvantages. For example, the spraying crystal coating method and the evacuation crystal coating method require special equipment, and the operation is complicated, and cannot completely fill the hole defects on the surface of the support body. For macroporous defects, it is difficult to form a continuous and uniform seed layer on the surface of the support by the wiping method, but it can effectively eliminate the defects on the surface of the film

Method used

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  • Method for synthesizing NaA zeolite membrane
  • Method for synthesizing NaA zeolite membrane
  • Method for synthesizing NaA zeolite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1 Repair of support defects

[0029] Firstly, the support body is pretreated, and the tubular mullite support body is smoothed with sandpaper, and the residual powder in the support body is cleaned by ultrasonic cleaning, and then dried. Take 40g of NaA molecular sieve powder with a size of about 500nm, add 40ml of distilled water to make a paste, use the seed crystal paste to wipe the support body, and put it in an oven at 50°C to dry for later use.

[0030] Step 2 Preparation of seed crystal support body

[0031] Weigh 0.5g of NaA seed crystals, add 50ml of distilled water, stir evenly and then fully oscillate in ultrasonic to make it dispersed into a uniform molecular sieve suspension solution. The repaired support body is pre-coated with seed crystals by dipping, and the residence time of the support body in the solution is 5 seconds. After coating the seed crystals, place them in an oven at 50°C to dry for later use.

[0032] Step 3 Synthesis of NaA type mo...

Embodiment 2

[0035] The support is pretreated first. Take 80g of NaA molecular sieve powder with a size of about 300nm, add 40gml of distilled water to make a paste, use the seed crystal paste to wipe the support body, and put it in an oven at 50°C to dry for later use.

[0036]Step 2 Preparation of seed crystal support body

[0037] Weigh 1g of NaA seed crystal, add 50ml of distilled water, stir evenly, and then oscillate fully in ultrasonic to make it dispersed into a uniform molecular sieve suspension solution. The repaired support is pre-coated with seed crystals by dipping, and the residence time of the support in the solution is 3 seconds. After coating the seed crystals, place them in an oven at 50°C to dry for later use. The synthesis of step 3NaA type molecular sieve membrane, with embodiment 1 step 3

Embodiment 3

[0039] Step 1 Repair of support defects

[0040] Same as in Example 1, the support body is pretreated first. Take 40g of NaA molecular sieve powder with a size of about 600nm, add 40ml of distilled water to make a paste, use the seed crystal paste to wipe the support body, and put it in an oven at 50°C to dry for later use.

[0041] Step 2 Preparation of seed crystal support body

[0042] Weigh 1g of NaA seed crystal, add 50ml of distilled water, stir evenly, and then oscillate fully in ultrasonic to make it dispersed into a uniform molecular sieve suspension solution. The repaired support is pre-coated with seed crystals by dipping, and the residence time of the support in the solution is 9 seconds. After coating the seed crystals, place them in an oven at 50°C to dry for later use.

[0043] The synthesis of step 3 NaA type molecular sieve membrane, with embodiment 1 step 3

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Abstract

The invention relates to a method for synthesizing a NaA molecular sieve membrane. A seed crystal coating mode of combining the coating and the dipping of seed crystal is used for the synthesis of the molecular sieve membrane. Firstly, a supporting body is polished by sand paper and is dried; a seed crystal paste is coated on the surface of the supporting body to remove the possible defects on the surface of the supporting body; secondly, the seed crystal is precoated by a lifting and dipping method; and finally the NaA molecular sieve membrane is synthesized by a hydrothermal synthesis method. The NaA molecular sieve membrane synthesized by the method has continuous and compact surface, excellent separation performance and good repeatability and is suitable for scale preparation.

Description

technical field [0001] The present invention relates to a method for synthesizing molecular sieve membranes, in particular to a method for synthesizing NaA molecular sieve membranes by pre-modifying the surface defects of the support body and coating seeds by using a seed crystal coating method combining wiping coating and pulling dipping . Background technique [0002] As a new type of membrane separation technology, pervaporation technology has been widely favored by the industry in recent years. It has obvious technical and economic advantages for the removal of trace water in organic solvents and mixed solvents and the separation of a small amount of organic pollutants in wastewater; it can also be coupled with biological and chemical reactions to continuously remove reaction products, Improve the reaction conversion rate. At present, pervaporation technology has been widely used in the dehydration of organic aqueous solutions such as alcohols, ketones, ethers, esters,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
CPCB01D67/0051B01D71/028B01D61/362
Inventor 顾学红张叶刘艳梅徐南平
Owner JIANGSU NINE HEAVEN HIGH TECH
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