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Preparation method for hollow fiber osmosis vaporation permeable complex film

A pervaporation and composite membrane technology, which is applied in the field of separation membrane preparation, can solve the problems of difficult industrial application, large footprint of membrane modules, and low mechanical strength, and achieve good uniformity, repeatability, convenient operation, and low price. Effect

Inactive Publication Date: 2008-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned blended membranes with sodium alginate use homogeneous flat membranes, which have low mechanical strength and are not easy for industrial applications. Compared with hollow fiber membranes, the membrane area per unit volume is smaller, and the membrane module occupies a large area. Large, and hollow fiber membranes have great advantages in these aspects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 20g of polyvinyl alcohol (PVA-1799), add 980g of distilled water, stir at a constant temperature of 85°C, and continue stirring for 20 to 30 minutes after the PVA is completely dissolved. Keep the container sealed during stirring to avoid evaporation of water at high temperatures. The resulting solution was suction filtered to remove insoluble matter, and the filtrate was set aside. Weigh 5g of sodium alginate, add 245g of distilled water, stir and dissolve at room temperature, and filter the obtained solution to remove insoluble matter. Blend the above two filtrates, add 18.75g of maleic anhydride, stir at a constant temperature of 30°C, and let the obtained solution stand or pump After vacuum defoaming, the film-making solution was made. Soak the polyacrylonitrile ultrafiltration membrane in 3wt% NaOH aqueous solution, keep it at room temperature for 1 hour, wash it with distilled water to neutral after taking it out, and dry it at room temperature for use. Im...

Embodiment 2

[0028] Weigh 20g of polyvinyl alcohol (PVA-1799), add 980g of distilled water, stir at a constant temperature of 85°C, and continue stirring for 20 to 30 minutes after the PVA is completely dissolved. Keep the container sealed during stirring to avoid evaporation of water at high temperatures. The resulting solution was suction filtered to remove insoluble matter, and the filtrate was set aside. Weigh 5g of sodium alginate, add 245g of distilled water, stir and dissolve at room temperature, and filter the resulting solution to remove insoluble matter. The above two filtrates are blended, and the resulting solution is left to stand or vacuumed for defoaming. Soak the polyacrylonitrile ultrafiltration membrane (base membrane) in 3wt% NaOH aqueous solution, keep it at room temperature for 1 hour, wash it with distilled water to neutral after taking it out, and dry it in room temperature. Immerse the treated basement membrane in the membrane-forming solution for 3-5 seconds, tak...

Embodiment 3

[0032]Weigh 50g of polyvinyl alcohol (PVA-1799), add 950g of distilled water, stir at a constant temperature of 85°C, and continue stirring for 20 to 30 minutes after the PVA is completely dissolved. Keep the container sealed during stirring to avoid evaporation of water at high temperatures. The resulting solution was suction filtered to remove insoluble matter, and the filtrate was set aside. Weigh 12.5g of sodium alginate, add 237.5g of distilled water, stir and dissolve at room temperature, and filter the resulting solution to remove insoluble matter. The above two filtrates were blended, 37.5 g of maleic anhydride was added, and stirred at a constant temperature of 30° C., and the obtained solution was left to stand or vacuumed for degassing, and then the film could be scraped. Soak the polyacrylonitrile ultrafiltration membrane in 3wt% NaOH aqueous solution, keep it at room temperature for 1 hour, wash it with distilled water to neutral after taking it out, and dry it a...

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PUM

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Abstract

The invention relates to a method for preparing hollow fiber penetrate gasify composite film, which comprises: (1), preparing filming liquid that preparing the polyvinyl alcohol water solution at 2-5wt% and the sodium alginate solution at 1-5wt%, mixing them and adding the crosslinker at 1-4wt%, mixing at constant temperature, or vacuum defoaming to prepare the filming liquid; (2), treating base film that immerging the base film into NaOH water solution at 1-5wt%, keeping it at room temperature for 1h to be washed by distilled water into neutral, to be crosslinked in bake tank; (3),coating film that immerging bae film into filming liquid for 3-5s, extracting out and drying at room temperature; coating film for 2-3 times, to be crosslinked in bake tank. The invention has simple operation, low cost, uniform film, and better separate property, while it can dewater alcohol, etc.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane, in particular to the preparation of a pervaporation alcohol dehydration membrane. Background technique [0002] The industrial application of membrane technology has a history of more than 40 years. Because of its simple process, wide application fields, and low energy consumption, it has been valued by countries all over the world. In China, processes such as microfiltration, ultrafiltration, electrodialysis, reverse osmosis and gas separation have been used in the production of high-purity water and in the fields of chemical industry, environmental protection, food, agriculture and medicine. [0003] In the pervaporation composite membrane separation process, the membrane has the property of preferentially permeating a certain component, which eliminates the constant boiling point and can realize the separation of two or more organic mixtures. The membrane separation process of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D69/12
Inventor 候同刚张林陈欢林董永全周志军
Owner ZHEJIANG UNIV
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