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Hollow fiber inner wall NaA type molecular sieve pervaporation film dynamically synthesized in continuous flowing system and synthesis method thereof

A pervaporation membrane and molecular sieve technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem that the synthesis liquid cannot be updated in time, and achieve reduced synthesis costs, simple equipment, and high repeatability of film formation Effect

Active Publication Date: 2018-12-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the limitation that the synthesis liquid cannot be updated in time due to the small space in the inner cavity of the small-diameter support, and to improve the technical problem of the effective length of the molecular sieve membrane tube, the present invention provides a dynamic synthesis of NaA molecular sieves on the inner wall of the hollow fiber in a continuous flow system Method of pervaporation membrane and NaA type molecular sieve pervaporation membrane on inner wall of hollow fiber

Method used

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  • Hollow fiber inner wall NaA type molecular sieve pervaporation film dynamically synthesized in continuous flowing system and synthesis method thereof
  • Hollow fiber inner wall NaA type molecular sieve pervaporation film dynamically synthesized in continuous flowing system and synthesis method thereof
  • Hollow fiber inner wall NaA type molecular sieve pervaporation film dynamically synthesized in continuous flowing system and synthesis method thereof

Examples

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Embodiment 1

[0029] Example 1: A method for dynamically synthesizing NaA molecular sieve pervaporation membranes on the inner wall of hollow fibers in a continuous flow system:

[0030] (1) Take α-Al with a length of 6cm 2 O 3 The hollow fiber is the support, soaked in 1.0 mol / L sodium hydroxide solution for 10 hours, then ultrasonically cleaned with deionized water until it is neutral, and placed in an oven at 70°C to completely dry;

[0031] (2) Ultrasonic dispersion of NaA molecular sieve particles with a particle size between 90 and 150 nm in deionized water to prepare a seed suspension with a solid content of 6 wt.%;

[0032] (3) Coating the seed layer: using the peristaltic pump as the driving force, the seed liquid prepared in step (2) is continuously passed through the ceramic hollow fiber support cavity at a flow rate of 3.0 ml / min for 30 seconds, and then reversed Flow and repeat the process, after the crystal coating is completed, put the support into an oven at 60℃ and dry for more th...

Embodiment 2

[0036] Example 2: A method for dynamically synthesizing NaA molecular sieve pervaporation membrane on the inner wall of hollow fiber in a continuous flow system:

[0037] Steps (1) to (4) are the same as in embodiment 1;

[0038] (5) Dynamic and continuous synthesis of NaA separation layer: the outer surface of the crystal-coated support is sealed and installed vertically in the synthesis device. The synthesis solution is always stirred at room temperature to maintain the uniformity of its components, and is driven by external force. Flow continuously at a flow rate of 0.26ml / min through the device pipeline and the internal cavity of the support and then return to the main body of the synthetic fluid to form a circulation. The synthetic fluid is only preheated to 90°C in the pipeline before entering the support and heated by a constant temperature. The device ensures that it is always maintained at this temperature after entering the inner cavity of the support. After 6 hours of dy...

Embodiment 3

[0040] Example 3: A method for dynamically synthesizing NaA molecular sieve pervaporation membranes on the inner wall of hollow fibers in a continuous flow system:

[0041] Steps (1) to (4) are the same as in embodiment 1;

[0042] (5) Dynamic and continuous synthesis of NaA separation layer: the outer surface of the crystal-coated support is sealed and installed vertically in the synthesis device. The synthesis solution is always stirred at room temperature to maintain the uniformity of its components, and is driven by external force. The flow rate of 0.52ml / min continuously flows through the device pipeline and the inner cavity of the support and then returns to the main body of the synthetic liquid to form a circulation. The synthetic liquid is only preheated to 90°C in the pipeline before entering the support and heated by a constant temperature. The device ensures that it is always maintained at this temperature after entering the inner cavity of the support. After 6 hours of ...

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Abstract

The invention discloses a method for dynamically synthesizing a hollow fiber inner wall NaA type molecular sieve pervaporation film in a continuous flowing system and the hollow fiber inner wall NaA type molecular sieve pervaporation film. The method comprises ceramic support pretreatment, preparation of a crystal seed suspension, coating of the inner wall of the hollow fiber with a crystal seed layer, preparation of a synthetic liquid, dynamic synthesis of a molecular sieve film layer in a material liquid circulating flowing device, and aftertreatment. The method has a high tolerance level ofthe support surface and crystal seed layer quality, the pervaporation separation performance of the film is excellent, the film uniformity is good, the effective length is long and the significant industrial practical application value is obtained.

Description

Technical field [0001] The invention relates to the synthesis of molecular sieve membranes, in particular to a method for dynamically synthesizing a hollow fiber inner wall NaA molecular sieve pervaporation membrane in a continuous directional flow system and the synthesized hollow fiber inner wall NaA molecular sieve pervaporation membrane. Background technique [0002] Inorganic molecular sieve materials are widely used in the field of membrane separation because of their excellent physical and chemical properties. Compared with the separation membranes of other inorganic materials, the pore structure of molecular sieve membranes is neat and uniform, and the pore size varies with the type of molecular sieve and is similar to the molecular size of many important industrial raw materials, plus its catalytic activity and good chemical and thermal stability. It has broad application prospects in gas separation, pervaporation separation, membrane reactors, sensors and many other fie...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D67/00B01D69/08B01D71/02
CPCB01D61/362B01D67/0039B01D69/08B01D71/028
Inventor 许振良曹悦李宇璇王明魏永明马晓华
Owner EAST CHINA UNIV OF SCI & TECH