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Preparation method of cellulose acetate nano filter-membrane

A cellulose acetate and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult to scrape the membrane, difficulty in stirring and dissolving evenly, high viscosity, etc. The effect of large amount and reduced usage

Inactive Publication Date: 2009-02-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high concentration of CA in the configured casting solution, the viscosity is very high, it is difficult to stir and dissolve evenly, and it is not easy to scrape the film. The film forming process has relatively high requirements on temperature and time, and a large amount of formamide is used in the film casting process. , a toxic solvent

Method used

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  • Preparation method of cellulose acetate nano filter-membrane
  • Preparation method of cellulose acetate nano filter-membrane
  • Preparation method of cellulose acetate nano filter-membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1, a kind of preparation method of cellulose acetate nanofiltration membrane, carries out following steps successively:

[0026] 1), put 12g of cellulose acetate (CA) into 100ml of acetone (AC) and stir for 24 hours, then add 25ml of water (H 2 (2, for example, distilled water can be used) to stir for 2 hours, and finally leave it to stand for 72 hours to obtain the casting solution;

[0027] 2), at a temperature of 15°C and a relative humidity (air) of 60%, use a scraper to scrape the above-mentioned casting solution on a clean glass plate to form a wet film with a thickness of 250 μm; then make the wet film at the same temperature as above Under the condition of humidity and humidity, stand on the glass plate to volatilize the solvent, and the standing time is 1 minute;

[0028] 3) The above volatilized wet film is immersed in 15°C distilled water for gel bath treatment until the wet film is fully gelled and solidified to form a film; an asymmetric film wi...

Embodiment 2

[0030] Embodiment 2, a kind of preparation method of cellulose acetate nanofiltration membrane, the temperature in step 2) is changed into 25 ℃, relative humidity is changed into 75%, and standing time is changed into 5 minutes; All the other are the same as embodiment 1 .

Embodiment 3

[0031] Embodiment 3, a kind of preparation method of cellulose acetate nanofiltration membrane, the consumption of the cellulose acetate in step 1) is changed into 15g; All the other are the same as embodiment 1.

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Abstract

The invention discloses a preparation method of a cellulose acetate nano filter membrane. The preparation method comprises the following steps: 1) the cellulose acetate is put into a solvent, stirred, added with a nonsolvent additive and stirred, then a mixture is obtained, the mixture stands still, and then casting membrane liquid is obtained; 2) the casting membrane liquid is made into a wet membrane with the thickness being 250mum by striking, then the wet membrane stands still in the air; (3) the wet membrane treated by the steps is immersed in distilled water for gel bath treatment, therefore, an asymmetrical membrane is obtained; and 4) ethanol water exchange treatment and pure cyclohexane exchange treatment are sequentially carried out on the asymmetrical membrane, then the cellulose acetate nano filter membrane is obtained. The nano filter membrane obtained by the preparation method has big flux and obvious separating effect.

Description

technical field [0001] The invention relates to a preparation method of a cellulose acetate nanofiltration membrane. Background technique [0002] Membrane separation technology is an emerging material separation, purification and concentration process, which can be operated continuously at room temperature without phase change; it has the advantages of energy saving and environmental protection in large-scale production; it is especially suitable for thermally volatile heat-sensitive substances, so in food, Medicine, water treatment and other fields are developing rapidly. The application of membrane technology in the field of traditional Chinese medicine is mainly to extract active substances from traditional Chinese medicine. The content of active properties in traditional Chinese medicine is low, and a large amount of organic solvents are often used in the traditional extraction process, so there are disadvantages such as complex extraction methods, low efficiency, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16
Inventor 张林陈欢林王瑜
Owner ZHEJIANG UNIV
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