Preparation method and application of hybrid pervaporation membrane

A pervaporation membrane and pervaporation technology, which is applied in the preparation and application of hybrid pervaporation membranes, achieves the effects of strong controllability, abundant raw material sources, and low price

Inactive Publication Date: 2009-11-11
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HZSM5 zeolite filled cellulose acetate membrane prepared by N,N-dimethylformamide as solvent pervaporation separation of methanol / MTBE mixture has not been reported in the literature

Method used

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  • Preparation method and application of hybrid pervaporation membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013]0.75g of cellulose acetate bound to 54.5-56.0wt% acetic acid and 0.0038g of ground HZSM5 zeolite with an average particle size of 0.5 μm were dissolved in 14.25g of N, N-dimethylformamide, and the After stirring at a rotating speed for 1 h to dissolve the cellulose acetate, continue to combine stirring at a rotating speed of 500 r / min and an ultrasonic power of 160 w for 1 h to obtain 15,0038 g of a uniformly dispersed casting solution containing 0.50 wt % zeolite. Let it stand for 10 minutes for defoaming to obtain a uniform and foam-free casting solution. Pour the foam-free casting solution on a clean glass plate, scrape the film with a 600 μm thick scraper, and dry it at 20°C for 26 hours to form a film (film 1). The average thickness of the film is 12 μm.

Embodiment 2

[0015] Dissolve 0.75g of cellulose acetate bound to 54.5-56.0wt% acetic acid and 0.0075g of ground HZSM5 zeolite with an average particle size of 0.5 μm in 14.25g of N,N-dimethylformamide at a speed of 500r / min After stirring for 1 hour to dissolve the cellulose acetate, continue to combine stirring at a speed of 500 r / min and an ultrasonic power of 160 W for 1 hour to obtain 15.0075 g of uniformly dispersed zeolite content of 1 wt % casting solution. Let it stand for 10 minutes for defoaming to obtain a uniform and foam-free casting solution. Pour the foam-free casting solution on a clean glass plate, scrape the film with a 600 μm thick scraper, and dry it at 20°C for 26 hours to form a film (film 2). The average thickness of the film is 12 μm.

Embodiment 3

[0017] Dissolve 0.75g of cellulose acetate bound to 54.5-56.0wt% acetic acid and 0.0114g of ground HZSM5 zeolite with an average particle size of 0.5 μm in 14.25g of N,N-dimethylformamide at a speed of 500r / min After stirring for 1 h to dissolve the cellulose acetate, continue to combine stirring at a speed of 500 r / min and a power of 160 w for 1 h to obtain 15.0114 g of a uniformly dispersed casting solution with a zeolite content of 1.5 wt%. Let it stand for 10 minutes for defoaming to obtain a uniform and foam-free casting solution. Pour the foam-free casting solution on a clean glass plate, scrape the film with a 600 μm thick scraper, and dry it at 20°C for 26 hours to form a film (film 3). The average thickness of the film is 12 μm.

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Abstract

The invention relates to a preparation method and application of hybrid pervaporation membrane. The method comprises the following steps: adding Cellulose acetate in which combined acetic acid accounts for 54.5 to 56.0 percent by weight and HZSM5 zeolite of which the average particle size is 0.5 mu m into N,N-dimethylformamide according to the mass ratio of 99.5:0.5-98:2 to prepare 5 mass percent solution; stirring the solution for 1 to 2 hours at a temperature of between 20 and 30 DEG C till the cellulose acetate is completely dissolved; ultrasonically stirring the solution for 1 to 2 hours, standing and defoaming to obtain casting solution; pouring the casting solution on a clean glass plate, scraping by use of a scraper, ventilating and drying for 24 to 30 hours at a temperature of between 20 and 30 DEG C; and obtaining HZSM5 filled cellulose acetate membrane. The obtained HZSM5 zeolite filled cellulose acetate membrane is used for the pervaporation and separation of methanol / MTBE mixture, wherein the permeation flux is up to 227g*mh, and the separation factor is 806. The method has the advantages of simple preparation process, abundant raw materials and low price.

Description

technical field [0001] The invention relates to a preparation method and application of an organic-inorganic hybrid pervaporation film filled with HZSM5 zeolite and cellulose acetate (CA) with N, N-dimethylformamide (DMF) as a solvent. Background technique [0002] Pervaporation is a process that utilizes the different dissolution and diffusion properties of components in a liquid mixture to separate them in a dense film. Pervaporation technology is mainly used in the dehydration of organic matter, the removal of organic matter from water and the separation of organic / organic mixtures. Compared with traditional distillation, adsorption, extraction and other separation processes, it has the advantages of high separation efficiency, simple equipment, convenient operation and low energy consumption. Under certain conditions, pervaporation membrane separation technology has high selectivity. Therefore, pervaporation has high separation efficiency for systems that are difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16C08L1/12C08K7/26C08K3/34C08J5/18
Inventor 姜忠义马晓聪祖凤华吴洪朴佳锐方新郭瑞丽
Owner PETROCHINA CO LTD
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