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Method for synthesizing phi-type molecular sieve membrane on the surface of α-al2o3 support

A support and molecular sieve technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of incomplete crystal form and compactness, and achieve high raw material utilization, high repeatability, and simple operation.

Inactive Publication Date: 2011-12-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yoshimichi Kiyozumi et al. prepared PHI molecular sieves on the support by the secondary growth method. Firstly, the seed crystal suspension was prepared, and the seed crystal was coated on the surface of the support by ordinary dip coating or electrostatic deposition, and dried, roasted and secondary grown. The molecular sieve membrane is obtained, but its crystal form is not complete and dense

Method used

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  • Method for synthesizing phi-type molecular sieve membrane on the surface of α-al2o3 support
  • Method for synthesizing phi-type molecular sieve membrane on the surface of α-al2o3 support
  • Method for synthesizing phi-type molecular sieve membrane on the surface of α-al2o3 support

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Experimental program
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Effect test

Embodiment 1

[0031] Pretreatment of supports: α-Al 2 o 3 Before use, the support body should be smoothed with 1000-mesh sandpaper, then rinsed with an appropriate amount of deionized water, soaked in a beaker filled with 50ml of deionized water, and ultrasonicated for 30 minutes under ultrasonic conditions (ultrasonic power: 100W, temperature: 25°C) , and finally rinsed three times with deionized water. The cleaned basement membrane support was placed in an oven, dried at 120°C for 6 hours, and then placed in a dust-free place for use.

[0032] The synthetic seed crystal liquid used in the synthesis of PHI type molecular sieve membrane is configured as follows:

[0033] Solution A: Weigh 1.5g NaOH, 1.9g KOH, dissolve in a polytetrafluoroethylene beaker filled with 73.0g deionized water, add 13.7g NaAlO 2 , placed on a magnetic stirrer (at room temperature, with a rotation speed of 350rpm) to stir and dissolve to obtain solution A;

[0034] Solution B: Weigh 67.0g silica sol (30.0wt% Si...

Embodiment 2

[0045] Pretreatment of support body: basement membrane support body α-Al used in the method of the present invention 2 o 3 Before use, the support body should be smoothed with 800-grit sandpaper, then rinsed with an appropriate amount of deionized water, soaked in a beaker filled with 50ml of deionized water, and ultrasonicated for 40 minutes under ultrasonic conditions (ultrasonic power: 50W, temperature: 25°C) , and finally rinsed three times with deionized water. The cleaned basement membrane support was placed in an oven, dried at 100°C for 7 hours, and then placed in a dust-free place for use.

[0046] The synthetic seed crystal liquid used in the synthesis of PHI type molecular sieve membrane is configured as follows:

[0047] Solution A: Weigh 1.5g NaOH and 1.9g KOH, dissolve them in a polytetrafluoroethylene beaker filled with 99.0g deionized water, add 12.6g NaAlO 2 , placed on a magnetic stirrer (at room temperature, with a rotation speed of 350rpm) to stir and di...

Embodiment 3

[0059] Pretreatment of support body: basement membrane support body α-Al used in the method of the present invention 2 o 3 Before use, the support body should be smoothed with 1000-mesh sandpaper, then rinsed with an appropriate amount of deionized water, soaked in a beaker filled with 50ml of deionized water, and ultrasonicated for 30 minutes under ultrasonic conditions (ultrasonic power: 50W, temperature: 30°C) , and finally rinsed three times with deionized water. The cleaned basement membrane support was placed in an oven, dried at 100°C for 8 hours, and then placed in a dust-free place for use.

[0060] The synthetic seed crystal liquid used in the synthesis of PHI type molecular sieve membrane is configured as follows:

[0061] Solution A: Weigh 7.5g NaOH and 1.9g KOH, dissolve them in a polytetrafluoroethylene beaker filled with 110.0g deionized water, add 4.1g aluminum powder, and stir on a magnetic stirrer (normal temperature, speed 350rpm) Solution A is obtained a...

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Abstract

The invention discloses a method for synthesizing a PHI-type molecular sieve membrane on the surface of an α-Al2O3 support body. In the method, the support body pretreatment and the preparation of a seed crystal synthesis solution are carried out first, and then the crystal seed is introduced, and then the membrane is synthesized and washed and dried. The PHI type molecular sieve membrane is obtained; the preparation of the seed crystal synthesis solution is to configure alkali, silicon source, aluminum source and deionized water according to the molar ratio of Na2O, K2O, SiO2, Al2O3 and H2O, a1, b1, c1, 1 and d1, The source of alkali is Na2O and K2O, a1=1.5-2.5, b1=0.2-0.5, c1=4-8, d1=80-108; the molecular sieve membrane synthesized by the present invention has perfect crystal form, compact structure and good permeability, The synthesis process has high repeatability, the membrane has a long service life, and is suitable for industrial scale-up.

Description

technical field [0001] The invention provides a method for synthesizing molecular sieve membranes, in particular to a 2 o 3 The invention discloses a method for synthesizing a PHI molecular sieve membrane on the surface of a support body, belonging to the technical field of inorganic membrane material preparation. technical background [0002] Membrane separation technology is a new type of high-efficiency separation technology, which has been widely used in chemical, food, pharmaceutical and other industries in recent years. Pervaporation (PV for short) is a kind of membrane separation technology, which is a new process with high efficiency, low energy consumption and low investment. Its separation principle is not limited by thermodynamic equilibrium, mainly depends on the interaction between the membrane and the permeate components, especially suitable for the separation of near-boiling point, azeotropic point mixtures and isomers that are difficult or impossible to sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10
Inventor 袁文辉常然然梁杰李莉
Owner SOUTH CHINA UNIV OF TECH
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