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,

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
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Example Embodiment

[0022] Example 1

[0023] Step 1. Carrier tube pretreatment

[0024] The surface of the carrier tube was sanded with 600# and 800# waterproof sandpaper in turn until the surface of the carrier was smooth, and then ultrasonically vibrated with acid and alkali to remove residues in the carrier pores, washed with deionized water to neutrality, and dried naturally. Finally, it is dried at 150°C for use.

[0025] Step 2. Preparation of carrier seed layer

[0026] (1) Using hot dipping-wiping method to coat large seed crystals on the processed carrier tube: Raise the self-made NaA molecular sieve with a grain size of 1~3μm to 550℃ at a rate of 1K / min, and keep it 4h to remove the organic template in the molecular sieve, and then configure it into a 10% seed solution, and quickly immerse the carrier tube that has been baked at 180°C for 4h into the above seed solution. The immersion time is 20s. Afterwards, the carrier tube coated with the seed crystals is dried in an oven at 50-100°C, and...

Example Embodiment

[0031] Example 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 dip-wiping method was used to coat the large seed crystals on the surface of the carrier, and the small seed crystals were not coated. The procedure is the same as the procedure (1) in step 2 in embodiment 1.

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

[0037] Since only large seed crystals are applied, the separation selectivity of the NaA zeolite membrane synthesized by one-step crystallization needs to be improved. In order to further improve the separation performance of the NaA zeolite membrane, a two-step crystallization synthesis is adopted. The first step of the synthesis process is completely the same as step 3 in Example 1. In the second step of synthesis, the conditions and formula are changed. The specific implementation process is as follows: Put 6.80g NaAlO in a 200m...

Example Embodiment

[0039] Example 3

[0040] The membrane tubes synthesized in Example 1 and Example 2 were studied on the pervaporation performance of ethanol / water system respectively, and the process is as follows image 3 As shown, for an ethanol / water system with an ethanol mass fraction of 90%, the operating temperature is 70°C, and the vacuum degree on the permeate side is 200-400 Pa. The separation coefficient and permeation flux of the NaA molecular sieve membrane synthesized are respectively 5000- 10000 and 1.5~2.0kg / m 2 h. It exhibits 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
CPCB01D67/0051B01D71/028B01D2323/12C07C29/76B01D2323/42
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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