A kind of preparation method and application of acid-resistant psq composite membrane

A composite membrane, acid-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex membrane-forming mechanism, high carrier requirements, and large performance fluctuations of zeolite membranes, achieving good Effects of hydrothermal stability, membrane area reduction, and tunable surface properties

Active Publication Date: 2022-03-01
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the film-forming mechanism of zeolite membranes, the difficulty in preparation, the high requirements on the carrier, and the need for expensive templates, it is difficult to expand its application
Moreover, although zeolite membranes (such as A-type zeolite and mordenite) show certain acid resistance properties, their acid resistance is only limited to weak acid conditions (such as acetic acid) in the current literature reports, and its performance will decrease as the concentration of weak acids increases. Decrease, and the overall performance fluctuates greatly in strong acid (such as nitric acid) system

Method used

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  • A kind of preparation method and application of acid-resistant psq composite membrane
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  • A kind of preparation method and application of acid-resistant psq composite membrane

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Effect test

Embodiment 1

[0025] (1) Dissolve 1,2-(triethoxysilyl)ethylene (BTESEthy) in an alcohol solvent with a mass fraction of 5wt%, add deionized water and 2wt% hydrochloric acid, and stir continuously for 30min in a water bath at 50°C , wherein the molar ratio of BTESM, water, and hydrochloric acid is 1:80:0.1.

[0026] (2) step (1) after acid catalyzed reaction, add ammoniacal liquor and carry out alkali catalyzed reaction, add the ammoniacal liquor that massfraction is 5wt% in molar ratio ammoniacal liquor: hydrochloric acid (the hydrochloric acid that is step (1)) is the ratio of 9:1, 50 ℃ Stir continuously in a water bath for 60 minutes to carry out alkali-catalyzed reaction, so that the particle size of the sol increases.

[0027] (3) add hydrochloric acid to carry out acid-catalyzed reaction after alkali catalysis, according to molar ratio hydrochloric acid: the ratio of ammoniacal liquor is 1.2:1 adding mass fraction is the hydrochloric acid of 2wt% to stop the alkali-catalyzed reaction o...

Embodiment 2

[0030] (1) Dissolve 1,2-bis(triethoxysilyl)methane (BTESM) in an alcohol solvent at 5 wt% by mass fraction, add deionized water and 2 wt% hydrochloric acid, and continuously stir in a water bath at 50°C 30min, wherein the molar ratio of BTESM, water and hydrochloric acid is 1:60:0.1.

[0031] (2) Add ammonia water with a mass fraction of 5wt% at a ratio of 10:1 to hydrochloric acid, and stir continuously in a water bath at 50°C for 60 minutes to carry out alkali-catalyzed reaction to increase the particle size of the sol.

[0032] (3) Molar ratio hydrochloric acid: ammoniacal liquor is the ratio of 1.5:1 to add the hydrochloric acid that the mass fraction is 2wt% to stop the alkali-catalyzed reaction of step (2), the reaction time is 45min, and reaction temperature is 45 ℃, generates stable under acidic environment BTESM Sol.

[0033] (4) Coating silica-zirconia sol on the ceramic support to form a transition layer, the transition layer is 0.5 wt% silica-zirconia sol. The tr...

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Abstract

The invention discloses a preparation method and application of an acid-resistant PSQ composite membrane, and belongs to the technical field of membrane separation preparation. The preparation method includes the following steps: (1) dissolving a PSQ precursor in an alcohol solvent, and sequentially adding hydrochloric acid, ammonia water and hydrochloric acid to perform an acid-base-acid alternating catalytic reaction to obtain PSQ sol. (2) Coating silica-zirconia sol on the ceramic support to form a transition layer. (3) Coating PSQ sol on the surface of the transition layer as a separation layer, and dipping-pulling to obtain a PSQ composite membrane having a structure of a support layer, a transition layer and a separation layer. The PSQ composite membrane provided by the present invention has good acid resistance, high flux and high selectivity, meets current industrial needs and expectations, and is widely used in organic solvent dehydration and organic solvent separation in acidic systems.

Description

technical field [0001] The invention belongs to the field of membrane separation preparation, in particular to a preparation method and application of an acid-resistant PSQ composite membrane. Background technique [0002] Anhydrous-grade organic solvents are essential in the fields of petrochemical, fine chemical, pharmaceutical and food industries, so it is particularly important to separate a small or trace amount of water from organic solvents to obtain anhydrous-grade organic solvents. Traditional organic solvent dehydration technologies such as extractive distillation, azeotropic distillation, and molecular sieve adsorption have disadvantages such as high energy consumption, complex process, high operating cost, and environmental pollution. Therefore, the above fields are facing the challenge of energy saving and emission reduction. Membrane separation technology has the advantages of high efficiency, low energy consumption, easy control, and small footprint, and it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D61/36B01D61/02
CPCB01D67/0079B01D69/12B01D69/125B01D61/362B01D61/027B01D61/025
Inventor 徐荣刘倩钟璟任秀秀左士祥
Owner CHANGZHOU UNIV
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