ZSM-5 molecular sieve filled silicon rubber/cellulose acetate composite membrane and preparation method thereof

A technology of ZSM-5 and cellulose acetate, which is applied in the field of permeable membranes, can solve problems such as unfavorable large-scale treatment, environmental hazards, and complicated processes, and achieve low production costs, low prices, and reasonable membrane-making processes.

Inactive Publication Date: 2010-09-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A large amount of acetaldehyde wastewater is produced in the process of acetaldehyde production, and if the wastewater is discharged directly, it will cause serious harm to the environment
Traditional acetaldehyde wastewater treatment methods have disadvantages such as high cost and complicated process, which are not conducive to large-scale treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of ZSM-5 molecular sieve filled silicone rubber / cellulose acetate composite membrane, the method may further comprise the steps:

[0049] (1) Weigh 0.25g of ZSM-5 molecular sieve, put it into a muffle furnace and roast at 300°C for 3h, add 8ml (7.2g) of ethyl acetate, and ultrasonically disperse for 1h to obtain a molecular sieve dispersion;

[0050] (2) Weigh 5g of silicone rubber and put it into a beaker, then add 8ml (7.2g) of ethyl acetate, then stir magnetically until it is completely dissolved, add molecular sieve dispersion, and then add 0.25g of crosslinking agent tetraethyl orthosilicate, After magnetically stirring for 1 hour, add 0.2 g catalyst organotin and stir for 10 minutes to obtain a casting solution;

[0051] (3) Soak the cellulose acetate (CA) supporting film in clean water to make it fully wetted and saturated;

[0052] (4) Fix the wetted CA support film on a glass plate, wipe off the surface water, pour the casting solution eve...

Embodiment 2

[0057] Using the same process steps as in Example 1, only changing the amount of ZSM-5 molecular sieve to 0.1g, the performance of the obtained composite membrane pervaporation separation of acetaldehyde solution is: permeation flux 149.3g / m 2 h, separation factor 7.2.

Embodiment 3

[0059] Using the same process steps as in Example 1, only changing the amount of zsm-5 molecular sieve to 0.4g, the performance of the obtained composite membrane for pervaporation of acetaldehyde aqueous solution is: permeation flux 96.4g / m 2 h, separation factor 5.0.

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Abstract

The invention relates to a ZSM-5 molecular sieve filled silicon rubber / cellulose acetate composite membrane and a preparation method thereof. In the composite membrane, a cellulose acetate support membrane is used as a support layer, and the composite membrane also comprises the following components in parts by weight: 2-20 parts of ZSM-5 molecular sieve, 3-15 parts of cross-linking agent and 100 parts of silicon rubber. The preparation method comprises the following steps of: preparing materials, pretreating the molecular sieves, preparing a membrane casting solution, pretreating the support membrane and forming a membrane. Compared with the prior art, a penetration and evaporation membrane is prepared by adopting the ZSM-5 molecular sieves, the silicon rubber and the cellulose acetate, and the composite membrane preferentially permeates aldehyde and can be used for removing the aldehyde in waste water by a pervaporation method so as to achieve a separation effect. The composite membrane has the advantages of small pollution, low energy consumption, high efficiency, and the like, and meanwhile, the composite membrane has higher selectivity and flux. Moreover, the membrane preparation process is reasonable and simple, and the selected materials have low price and low production cost, thus the composite membrane has wide application range.

Description

technical field [0001] The invention relates to a permeable membrane, in particular to a ZSM-5 molecular sieve filled silicone rubber / cellulose acetate composite membrane and a preparation method thereof. Background technique [0002] Pervaporation is a new type of membrane technology for the separation of liquid mixtures. It forms a vacuum on the permeation side of the membrane, and uses the vapor partial pressure difference between the front and rear sides of the membrane as the driving force. Along with the phase change, the membrane is selectively adsorbed. And the separation is carried out due to the different permeation rates in the membrane. Its main features are high selective separation coefficient, high mass transfer rate, high thermal efficiency, simple operation, low energy consumption, easy implementation, and no need for pressurization. Pervaporation is especially suitable for the separation of near-boiling and azeotropic organic mixture solutions that are dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/70
Inventor 伍艳辉张丹丹勾明雷
Owner TONGJI UNIV
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