A kind of hollow fiber inner wall naa molecular sieve pervaporation membrane dynamically synthesized in a continuous flow system and its synthesis method
A technology of pervaporation membrane and molecular sieve, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem that the synthetic liquid cannot be updated in time.
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Embodiment 1
[0029] Example 1: A method for dynamically synthesizing a hollow fiber inner wall NaA molecular sieve pervaporation membrane in a continuous flow system:
[0030] (1) α-Al with a length of 6cm 2 o 3 The hollow fiber is used as a support, soaked in 1.0mol / L sodium hydroxide solution for 10 hours, then ultrasonically cleaned with deionized water until neutral, and placed in an oven at 70°C to completely dry;
[0031] (2) ultrasonically dispersing NaA molecular sieve particles with a particle size between 90 and 150 nm in deionized water to prepare a seed crystal suspension with a solid content of 6 wt.%.
[0032] (3) Coating the seed layer: With the peristaltic pump as the driving force, the seed liquid prepared in step (2) was continuously passed through the inner cavity of the ceramic hollow fiber support at a flow rate of 3.0ml / min for 30s, and then reversed Flow and repeat this process. After the crystal coating is completed, place the support in a 60°C oven to dry for more ...
Embodiment 2
[0036] Example 2: A method for dynamically synthesizing a hollow fiber inner wall NaA molecular sieve pervaporation membrane in a continuous flow system:
[0037] Steps (1) to (4) are the same as in Example 1;
[0038] (5) Dynamic and continuous synthesis of NaA separation layer: seal the outer surface of the crystal-coated support and install it vertically in the synthesis device. The synthesis solution is always kept stirring at room temperature to maintain the uniformity of its components. At a flow rate of 0.26ml / min, it flows continuously through the pipeline of the device 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 the temperature is always maintained after it enters the inner cavity of the support. After 6 hours of dynamic continuous reaction, th...
Embodiment 3
[0040] Example 3: A method for dynamically synthesizing a hollow fiber inner wall NaA molecular sieve pervaporation membrane in a continuous flow system:
[0041] Steps (1) to (4) are the same as in Example 1;
[0042] (5) Dynamic and continuous synthesis of NaA separation layer: seal the outer surface of the crystal-coated support and install it vertically in the synthesis device. The synthesis solution is always kept stirring at room temperature to maintain the uniformity of its components. At a flow rate of 0.52ml / min, it flows continuously through the pipeline of the device 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 the temperature is always maintained after it enters the inner cavity of the support. After 6 hours of dynamic continuous reaction, th...
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