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NaA type molecular sieve membrane synthesized on surface of organic hollow fiber, and production method thereof

A fiber surface and molecular sieve technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor combination of organic materials and inorganic materials, large performance differences, and low cost , excellent performance and easy operation

Active Publication Date: 2015-08-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of organic materials and inorganic materials are very different, and the effect of directly growing inorganic membranes on the surface of organic hollow fibers is not good.
Therefore, how to solve the problem of poor combination of organic materials and inorganic materials is very urgent.

Method used

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  • NaA type molecular sieve membrane synthesized on surface of organic hollow fiber, and production method thereof
  • NaA type molecular sieve membrane synthesized on surface of organic hollow fiber, and production method thereof
  • NaA type molecular sieve membrane synthesized on surface of organic hollow fiber, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of NaA type molecular sieve seed crystal:

[0041] Na in molar ratio 2 O: Al 2 o 3 :SiO2 2 :H 2 O=2.9:0.48:1:98 to prepare a synthetic solution, weigh a certain amount of sodium aluminate and dissolve it in deionized water, and take another certain amount of sodium hydroxide and sodium silicate and dissolve it in deionized water, and then dissolve the sodium aluminate The solution was added dropwise to the sodium silicate solution, and after aging for 24 hours, it was heated in a constant temperature water bath at 80°C for 3 hours. After the seed crystal is synthesized by the hydrothermal method, the synthetic solution is centrifuged and washed with deionized water until there is no adhesion of amorphous gel-like substances on the surface of the seed crystal. At this time, the pH value of the seed crystal suspension is 8-9, and after drying, the obtained Seed.

[0042] (2) Preparation of composite seed layer:

[0043] First prepare composite seed ...

Embodiment 2

[0051] (1) Preparation of NaA type molecular sieve seed crystal:

[0052] With embodiment 1.

[0053] (2) Preparation of composite seed layer:

[0054] First prepare composite seed coating liquid, weigh 1.40g PES and join in NMP and stir to dissolve, then weigh the seed crystals obtained in step (1) (by seed crystal and PES mass ratio is 65:35, 70:30, 75:25, 80:20, and 85:15 were weighed five times) and ultrasonically dispersed to obtain a uniformly dispersed composite seed layer coating solution. Then, a composite seed layer is prepared by a dip coating method, and the organic hollow fiber membrane is immersed in the coating solution for 10 seconds, taken out, and dried at a low temperature to obtain a composite carrier.

[0055] (3) Preparation of NaA type molecular sieve membrane:

[0056] With embodiment 1.

[0057] Table 2 NaA molecular sieve membrane with PSF hollow fiber as support and PES / NaA composite middle layer added

[0058]

[0059]

[0060] As can be ...

Embodiment 3

[0062] (1) Preparation of NaA type molecular sieve seed crystal:

[0063] With embodiment 1.

[0064] (2) Preparation of composite seed layer:

[0065] First prepare composite seed coating liquid, weigh 1.40g PEI and join in 26.60g NMP and stir to dissolve, then weigh the seed crystals obtained in step (1) (by mass ratio of seed crystals and PEI is 65:35, 70: 30, 75:25, 80:20, and 85:15 were weighed five times) and ultrasonically dispersed to obtain a uniformly dispersed composite seed layer coating solution. Then, a composite seed layer is prepared by a dip coating method, and the organic hollow fiber membrane is immersed in the coating solution for 10 seconds, taken out, and dried at a low temperature to obtain a composite carrier.

[0066] (3) Preparation of NaA type molecular sieve membrane:

[0067] With embodiment 1.

[0068] Table 3 NaA molecular sieve membrane with PSF hollow fiber as support and PEI / NaA composite middle layer added

[0069]

[0070] From the d...

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Abstract

The invention discloses a method for synthesizing a NaA type molecular sieve membrane on the surface of an organic hollow fiber. The method comprises the following steps: synthesizing 800nm NaA type molecular sieve crystal seeds through adopting a hydrothermal synthesis technology, blending and dissolving the crystal seeds and an organic matter in an organic solvent according to a certain ratio to prepare a coating solution, carrying out a dip coating technology to obtain an organic hollow fiber carrier with a composite crystal seed layer, and synthesizing the NaA type molecular sieve membrane on the surface of the composite carrier by adopting the hydrothermal synthesis technology. The molecular sieve membrane has the excellent ethanol / water separation performance of an inorganic membrane, and also has the characteristics of large specific surface area, large filling density and low cost of an organic hollow fiber membrane. The crystal seed layer made in the invention is uniformly distributed, and the molecular sieve membrane obtained in the invention has the advantages of continuous and compact surface, high selectivity and flux, low price, and suitableness for large scale production.

Description

technical field [0001] The invention relates to a NaA molecular sieve membrane synthesized on the surface of an organic hollow fiber and a preparation method thereof. Background technique [0002] As a new membrane separation technology, pervaporation has been extensively researched and applied in the past two decades due to its advantages of high separation efficiency and low energy consumption. The pervaporation membrane technology for the dehydration of organic solvent / water systems achieved industrial application in the 1980s. At present, the pervaporation membrane modules used in industry are single in variety, and most of them are plate and frame membrane modules. Because it requires a mechanical support carrier, the preparation cost is high, which restricts the development of its industrial application. [0003] Compared with the plate-and-frame membrane module, the hollow fiber membrane module has the advantages of high packing density, small device footprint, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/10B01D67/00B01D61/36
Inventor 贺高红马惠昀代岩柏峰于淼王正宝
Owner DALIAN UNIV OF TECH
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