High-flux mordenite molecular sieve membrane as well as preparation method and application thereof

A mordenite and molecular sieve technology, which is applied in the field of high-flux mordenite molecular sieve membrane and its preparation, can solve the problems of low permeation flux, poor acid resistance, poor membrane reproduction, etc. of the sieve membrane, and achieves simple synthesis device and broad application prospects. , the preparation method is simple and efficient

Active Publication Date: 2021-06-04
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the following problems in the current preparation process of mordenite molecular sieve membranes: low permeation flux, poor acid resistance and poor membrane reproducibility of mordenite molecular sieve membranes faced by the dehydration of organic matter (such as acetic acid and carboxylate systems) in harsh acidic environments And other issues
Exploring the preparation method of mordenite molecular sieve membrane with high permeation flux and high reproducibility is still a real challenge for its industrial application

Method used

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  • High-flux mordenite molecular sieve membrane as well as preparation method and application thereof
  • High-flux mordenite molecular sieve membrane as well as preparation method and application thereof
  • High-flux mordenite molecular sieve membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Seed coating:

[0035] The support used in this experiment is the tubular mullite produced by Nikkato Co., Ltd. in Japan as the carrier for the synthesis of mordenite molecular sieve membranes. The inner and outer diameters of the carrier are 9mm and 12mm respectively, the length is 100mm, and the porosity is about 43%. , with an average pore size of about 1.3 μm. After alkali heat treatment, the carrier was smoothed with 1200-mesh sandpaper, washed with 80°C deionized water for 30 minutes, cleaned in an ultrasonic cleaner, and dried for later use.

[0036] Both ends of the mullite carrier were sealed with polytetrafluoroethylene plugs to force the seed crystals to be introduced only to the outer surface of the carrier. The sealed carrier tube was preheated in an oven at 100°C, and then the hot carrier was quickly put into a mordenite molecular sieve seed solution with a concentration of 0.5 wt%, and slowly removed after 40 seconds. Take out the polytetrafluoroethy...

Embodiment 2

[0046] The synthetic sol raw materials, proportions and operation steps used are the same as in Example 1, only the synthesis temperature is raised to 185° C., and the crystallization time is adjusted to 4 hours.

[0047] The synthetic molecular sieve membrane is used for pervaporation experiment and characterization, tests its pervaporation performance (90 ℃) in the acetic acid / water (90 / 10wt%) system, and experimental result sees WM-03 in table 2 (as Figure 4 ) and WM-04.

[0048] Table 2

[0049]

Embodiment 3

[0051] The operation that adopts is as embodiment 2, uses potassium hydroxide as alkali source in the synthetic raw material, and potassium fluoride is fluorine source, and other raw materials are with embodiment 2.

[0052] The synthesized molecular sieve membrane was used in the pervaporation experiment to test its pervaporation performance (90°C) in the acetic acid / water (90 / 10wt%) system. The experimental results are shown in WM-05 and WM-06 in the table.

[0053] table 3

[0054]

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Abstract

The invention relates to the technical field of pervaporation separation of molecular sieve membranes, and provides a high-flux mordenite molecular sieve membrane as well as a preparation method and application thereof. A multi-fluorine-source and multi-alkali-source sol system is adopted, and the pervaporation performance of the mordenite molecular sieve membrane is improved by adjusting the molar ratio of alkali metal cations in the synthesized sol. The preparation method disclosed by the invention is rapid and simple in process, a microstructure of the mordenite molecular sieve membrane is accurately constructed, and the high-flux mordenite molecular sieve membrane which is thin in membrane layer, continuous and compact is prepared. The problems of low permeation flux, poor reproducibility and the like of the mordenite molecular sieve membrane are solved, and theoretical and technical bases are laid for industrial application of the mordenite molecular sieve membrane in dehydration of acetic acid and carboxylic ester systems.

Description

technical field [0001] The invention relates to the technical field of molecular sieve membrane pervaporation separation, in particular to a high-flux mordenite molecular sieve membrane, a preparation method and application thereof. Background technique [0002] The dehydration process of acidic organic aqueous solutions such as high-concentration acetic acid is extremely important in the chemical industry, and membrane separation technology has interesting application potential in the dehydration process of organic aqueous solutions. Molecular sieve membrane pervaporation is a new type of membrane separation technology developed in recent decades to efficiently separate near-boiling or azeotropic mixtures. It has attracted widespread attention due to its advantages of high efficiency, energy saving, pollution-free and simple operation. Due to its moderate silicon-aluminum ratio (3-10) and excellent pore structure, the mordenite molecular sieve membrane not only exhibits exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/02B01D61/36
CPCB01D71/028B01D69/02B01D67/0039B01D61/362B01D2325/04
Inventor 陈祥树吴晓位李玉琴严智成桂田
Owner JIANGXI NORMAL UNIV
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