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Method for synthesizing NaA zeolite membrane on macroporous carrier

A zeolite molecular sieve membrane, macroporous carrier technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the application field limitation, difficult to obtain high flux and selectivity, chemical stability, thermal stability mechanical problems such as poor stability, to achieve the effect of high repeatability, excellent separation performance, and suitable for large-scale applications

Active Publication Date: 2010-11-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the pervaporation membranes used today are organic polymer membranes. This kind of material has the disadvantages of poor chemical stability, thermal stability and mechanical stability, and it is difficult to obtain high flux and selectivity, so that its application field is restricted. restricted

Method used

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  • Method for synthesizing NaA zeolite membrane on macroporous carrier
  • Method for synthesizing NaA zeolite membrane on macroporous carrier
  • Method for synthesizing NaA zeolite membrane on macroporous carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Carrier tube pretreatment

[0024] Polish the surface of the carrier tube with 600# and 800# waterproof sandpaper in turn until the surface of the carrier is smooth, then use acid and alkali ultrasonic vibration to remove the residue in the carrier hole, wash with deionized water until neutral, and then dry naturally. Finally, dry it at a temperature of 150° C. for later use.

[0025] Step 2. Preparation of carrier seed layer

[0026] (1) Apply large seed crystals on the treated carrier tube by hot dipping-wiping coating method: heat up the self-made NaA molecular sieve with a grain size of 1-3 μm to 550 °C at a rate of 1K / min, and keep 4h, to remove the organic template in the molecular sieve, and then configure it into a 10% seed crystal aqueous solution, quickly immerse the carrier tube that has been baked at 180°C for 4h into the above seed crystal solution, and the immersion time is 20s. Afterwards, the carrier tube coated with the seed crystals is dried ...

Embodiment 2

[0032] Step 1. Carrier tube pretreatment

[0033] Same as step 1 in Example 1.

[0034] Step 2. Preparation of carrier seed layer

[0035] This time, only the hot dipping-wiping method was used to coat the large seeds on the surface of the carrier, and no small seeds were coated. Step is the same as the process (1) in step 2 in embodiment 1.

[0036] Preparation of step 3.NaA zeolite molecular sieve membrane

[0037] The separation selectivity of the NaA zeolite membrane synthesized by one-step crystallization needs to be improved because only a large seed crystal is coated. In order to further improve the separation performance of the NaA zeolite membrane, a two-step crystallization synthesis is adopted. The first step synthesis process is completely the same as Step 3 in Example 1. The second step of synthesis then changes the conditions and formula, and the specific implementation process is as follows: in a 200ml beaker, 6.80g NaAlO 2 and 2.072g NaOH were fully dissol...

Embodiment 3

[0040] Carry out the pervaporation performance research of ethanol / water system respectively to the film tube synthesized in embodiment 1 and embodiment 2, its flow process is as follows image 3 As shown, for an ethanol / water system with a mass fraction of ethanol of 90%, the operating temperature is 70°C, and the vacuum on the permeation side is 200-400Pa, the separation coefficient and permeation flux of the NaA molecular sieve membrane synthesized are 5000-400 Pa, respectively. 10000 and 1.5~2.0kg / m 2 h. It shows good separation performance and has important industrial application value and practical significance.

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Abstract

The invention discloses a method for synthesizing a NaA zeolite membrane on a macroporous carrier, and belongs to the technical field of chemical engineering separation. The method is characterized by comprising the following steps of: coating a continuous and uniform crystal seed layer on the surface of a carrier by a hot-dipping process-swabbing process aiming at macroporous carriers of variousmaterials provided by domestic markets; and regulating and controlling the growth of a synthetic membrane and the separation property of the membrane by the difference of the crystal grain sizes of acrystal seed, wherein the NaA zeolite membrane has high separation property and is synthesized by preparing a synthetic solution of Na2O, SiO2, Al2O3 and H2O in a mole ratio of 1-20:2-5:1:100-1,000 and performing dynamic hydrothermal crystallization in a circulating air oven. The method has the effects and the advantages that: the synthesized NaA zeolite membrane has high separation property and high repeatability, is suitable for large-scale application and has important industrial application value.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and relates to a method for synthesizing a zeolite molecular sieve membrane, in particular to a method for preparing a NaA zeolite molecular sieve membrane with excellent performance after pre-coating crystal seeds on a macroporous carrier by using a hot dipping-wiping coating method. Background technique [0002] Pervaporation (PV) is a membrane separation technology that has developed rapidly in the past two decades. It uses the different adsorption (or dissolution or sieving) and diffusion properties of each component in a binary or multi-component liquid mixture on the separation membrane. To achieve the separation of mixtures, it can be seen from the principle of pervaporation that the pervaporation membrane separation process is not limited by the vapor-liquid equilibrium, so it has unique advantages for the separation of near-boiling and azeotropic substances that are difficult ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D61/36C07C31/08C07C29/78B01D67/00
CPCB01D67/0051B01D71/028B01D2323/12C07C29/76B01D2323/42C07C31/08B01D71/0281
Inventor 王金渠杨建华盛春光周志辉陈赞鲁金明殷德宏张艳
Owner DALIAN UNIV OF TECH
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