Preparation method of pervaporation composite membrane filled with hydrophobically modified nano calcium carbonate

A technology of nano-calcium carbonate and hydrophobic modification, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of low total solvent content of fermentation broth, high processing cost, low production capacity, etc., and achieve a wide range Industrial application prospect, effect of improving membrane pore size and flux

Active Publication Date: 2014-10-29
宣城市红兴碳酸钙有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of this type of energy by biological fermentation is mainly inhibited by the product ethanol or butanol, the total solvent content in the fermentation broth is low, the production capacity is low, and the post-processing cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 60°C for 8 hours, then wash the nano-calcium carbonate repeatedly with solvent n-hexane to remove excess oleic acid, and place in a vacuum oven at 80°C Drying in medium temperature, after grinding, hydrophobically modified nano-calcium carbonate is obtained;

[0015] (2) Preparation of polyvinylidene fluoride base film: Take 10 g of dried polyvinylidene fluoride and 1 g of hydrophobic nano-calcium carbonate, mix the two and add to the solvent dimethylacetamide to form a 15wt% solution, and ultrasonically Disperse, stir evenly at 65°C, filter, let it stand for degassing, and then pour it on the polyester non-woven fabric to scrape the film. The water is the gel bath, and the modified polyvinylidene fluoride is obtained by immersion precipitation phase inversion method Base film, dry at room temperature;

[0016] (3) Preparation of silicone rubber composite film: Dissolve ...

Embodiment 2

[0019] (1) Add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 75°C for 1.5h, then wash the nano-calcium carbonate repeatedly with solvent n-hexane to remove excess oleic acid, and place it in a vacuum at 80°C Drying in an oven and grinding to obtain hydrophobically modified nano-calcium carbonate;

[0020] (2) Preparation of polyvinylidene fluoride base film: Take 10 g of dried polyvinylidene fluoride and 2 g of hydrophobic nano-calcium carbonate, mix the two and add them to the solvent dimethylacetamide to form a 10wt% solution, and ultrasonically Disperse, stir evenly at 75°C, filter, let it stand for degassing, and then pour it on the polyester non-woven fabric to scrape the film. The water is the gel bath, and the modified polyvinylidene fluoride is obtained by immersion precipitation phase inversion method Base film, dry at room temperature;

[0021] (3) Preparation of silicone rubber composite film: Dissolve 10g of polydimeth...

Embodiment 3

[0024] (1) Add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 80°C for 3 hours, then wash the nano-calcium carbonate repeatedly with solvent n-hexane to remove excess oleic acid, and place in a vacuum oven at 80°C Drying in medium temperature, after grinding, hydrophobically modified nano-calcium carbonate is obtained;

[0025] (2) Preparation of polyvinylidene fluoride base film: take 10 g of dried polyvinylidene fluoride and 0.5 g of hydrophobic nano-calcium carbonate, mix the two and add them to the solvent dimethylacetamide to form a 25wt% solution. Ultrasonic dispersion, and stir evenly at 75 ° C, filter, stand still for defoaming, and then pour it on the polyester non-woven fabric to scrape the film, the water is the gel bath, and the modified polyvinylidene fluoride is obtained by immersion precipitation phase inversion method Vinyl backing film, dry at room temperature;

[0026](3) Preparation of silicone rubber composite f...

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Abstract

The invention discloses a preparation method of a pervaporation composite membrane filled with hydrophobically modified nano calcium carbonate. The preparation method of the pervaporation composite membrane filled with hydrophobically modified nano calcium carbonate comprises the following steps: (1) adding dried nano calcium carbonate into oleic acid, stirring for reacting, then repeatedly washing with hexane for removing excess oleic acid,, drying in vacuum, and grinding so as to obtain hydrophobically modified nano calcium carbonate; (2) mixing dried polyvinylidene fluoride with hydrophobically modified nano calcium carbonate, subsequently adding the mixture into dimethylacetamide, carrying out ultrasonic dispersion, stirring, filtering, standing and defoaming, and subsequently pouring the obtained liquid on a polyester non-woven fabric for scraping a membrane so as to obtain a modified polyvinylidene fluoride base membrane by using an immersion precipitation phase inversion method; and (3) dissolving polydimethylsiloxane in n-hexane, adding hydrophobically modified nano calcium carbonate, carrying out ultrasonic dispersion, adding a cross-linking agent and a catalyst, stirring for reacting, centrifuging and dedoaming, subsequently pouring the obtained liquid on the polyvinylidene fluoride base membrane for scraping the membrane, airing and drying the membrane in vacuum to prepare the pervaporation composite membrane. The composite membrane prepared by the method is simple in process and low in cost, and moreover, the selectivity and the flux of the composite membrane on alcohol are improved.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobically modified nano calcium carbonate filled pervaporation composite membrane, belonging to the technical field of pervaporation membrane separation. Background technique [0002] Affected by the energy crisis, oil prices have risen, and ethanol or butanol, as a new type of bioenergy, has attracted more and more attention. The production of this type of energy by biological fermentation is mainly inhibited by the product ethanol or butanol. The total solvent content in the fermentation broth is low, the production capacity is low, and the post-processing cost is high. In order to solve the above problems, scientists try to combine some separation methods, such as pervaporation (PV), adsorption, liquid-liquid extraction, gas stripping and reverse osmosis, etc. (Ezeji, T.C., N. Qureshi, and H.P. Blaschek, Butanol fermentation research: Upstream and downstream manipulations. Chemical Record , 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D71/34B01D67/00
Inventor 娄尤来
Owner 宣城市红兴碳酸钙有限公司
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