Microwave synthesis method of supported molecular sieve membrane

A microwave synthesis, supported technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, membranes, etc., can solve problems such as poor product performance stability, and achieve the advantages of prolonging aging time, reducing energy consumption and reducing production costs. Effect

Inactive Publication Date: 2019-03-29
HYMATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to further provide improved technology and process on the basis of the in-situ aging-microwave synthesis method for preparing molecular sieve membranes, and strive to solve the problem of poor product performance stability during synthesis, so as to further stably exert microwave functions in the field of molecular sieve membrane synthesis. applications, ultimately pushing the technology to the forefront of industrial applications

Method used

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  • Microwave synthesis method of supported molecular sieve membrane
  • Microwave synthesis method of supported molecular sieve membrane
  • Microwave synthesis method of supported molecular sieve membrane

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[0017] As a preferred embodiment, the present invention provides a synthetic method that is specifically applicable to supported type A molecular sieve membranes, the method comprising the following steps:

[0018] ① Use deionized water as a solvent to prepare a synthetic solution, which contains 2 to 5 mol / L Na in terms of molar concentration a O, 0.04~0.06mol / LAL 2 o 3 , and 0.2~0.6mol / L SiO 2 .

[0019] ②Aging: Put the tubular support made of alumina and the synthesis solution in the reaction kettle, and put it in the microwave oven for synthesis, and let it stand at 30-45°C for 16-20 hours to fully age;

[0020] ③Heating up: Use a microwave oven to supply energy, and slowly heat up to the synthesis temperature in 3 to 6 minutes;

[0021] ④Synthesis: Use a microwave oven to supply energy, and synthesize at 80-120°C for 7-9 minutes;

[0022] ⑤ washing and drying;

[0023] ⑥Repeat the above operations ①~⑤, 2~3 times.

Embodiment 1

[0037] The preparation of LTA type molecular sieve membrane product I comprises the following steps

[0038](1) Prepare synthetic liquid I according to the following method;

[0039] Prepare Solution A 1 : Dissolve 15.0 grams of NaOH in 100 ml of deionized water, then add 0.54 grams of metal aluminum foil, and dissolve to obtain solution A 1 ;

[0040] Solution B 1 : Dissolve 25.0 grams of NaOH in 75ml of deionized water, then add 10ml of silica sol (which contains SiO 2 The mass percentage composition is 30%), dissolves and obtains solution B 1 ;

[0041] Solution A 1 and solution B 1 Mix well to obtain a uniform and clear synthetic solution I. In the resulting synthetic liquid I, the contained substances are converted into 50Na according to the molar ratio 2 O: Al 2 o 3 :5SiO2 2 :1010H 2 O. The corresponding converted molar concentrations are: Na 2 O, 2.64mol / L; Al 2 o 3 , 0.053mol / L; SiO 2 , 0.263mol / L.

[0042] (2) A tubular porous alumina ceramic suppor...

Embodiment 2

[0049] Preparation of LTA-type molecular sieve membrane product II

[0050] (1) Prepare Synthetic Solution II as follows:

[0051] Prepare solution A 2 : Dissolve 429 grams of NaOH in 2000ml deionized water, then add 42.3 grams of sodium metaaluminate, and dissolve to obtain solution A 2 ;

[0052] Prepare Solution B 2 : Dissolve 429 grams of NaOH in 2000ml deionized water, then add 343 grams of sodium silicate nonahydrate, dissolve to obtain solution B 2 ;

[0053] Solution A 2 and solution B 2 Mix well to get uniform and clear Synthetic Liquid II. In the obtained synthetic solution II, the contained substances are converted according to the molar ratio: 51Na 2 O: Al 2 o 3 :5SiO2 2 :1030H 2 O. The corresponding molar concentration is: Na 2 O, 2.64mol / L; Al 2 o 3 , 0.053mol / L; SiO 2 , 0.263mol / L.

[0054] (2) A tubular porous alumina ceramic support body with a length of 1030mm and a diameter of 1.2cm is fixed with a bracket, placed vertically in a polytetraf...

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Abstract

The invention provides a microwave synthesis method of a supported molecular sieve membrane. The microwave synthesis method comprises the steps of aging, heating and synthesizing, wherein the aging step is used for enabling a support to be in contact with a synthesis solution for 10 to 24 hours at 25 to 70 DEG C; the heating step is used for heating a system after aging from aging temperature to synthesis temperature within 1 to 10 minutes; the synthesizing step is used for synthesizing for 2 to 15 minutes at 80 to 120 DEG C; power for the heating step and the synthesizing step is supplied through microwaves. Compared with the prior art, according to the microwave synthesis method provided by the invention, the problem of poor product stability during a production process is effectively solved, the percent of pass of products and the rate of high-quality products are greatly increased, the supply period is shortened, the consumed time of a microwave synthesis stage is greatly reduced,and the energy consumption is reduced, so that the production cost is effectively reduced, the resource consumption is reduced, and the waste discharge is reduced; the large-scale industrial application of a molecular sieve membrane separation technology has practical operability.

Description

technical field [0001] The invention belongs to the field of novel separation technology, and in particular relates to a method for synthesizing molecular sieve membranes with microwaves and products thereof. Background technique [0002] Since the end of the last century, the synthesis of molecular sieve membranes has been one of the research hotspots in the academic and industrial circles all over the world, and there are many related patents and literature reports. Various methods such as the secondary growth method of precoated seed crystals and the gel synthesis method have shown good application prospects in the laboratory research stage (JP08, 318, 141). However, in the face of the scale-up synthesis requirements of industrial applications, these methods often need to face the temperature gradient in the heat transfer process and the sedimentation phenomenon under the influence of gravity, which leads to a serious decline in the quality of the synthesized molecular si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/5024C04B41/85C04B41/455C04B41/4539C04B35/10C01B39/46C01B39/20C01B39/16C02F1/448C02F2101/34B01D71/028B01D69/10B01D69/105B01D2323/14B01D2323/08B01D2323/34B01D61/362B01D67/0083C01P2002/72C01P2004/03
Inventor 李砚硕陈晨吴大朋
Owner HYMATER CO LTD
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