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Pervaporation membrane for esterification reaction and method for producing the same

A technology of pervaporation membrane and esterification reaction, which is applied in the field of pervaporation membrane preparation and achieves the effects of strong controllability, low price and simple preparation process

Inactive Publication Date: 2008-07-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing pervaporation membranes used for esterification-pervaporation coupling process can be divided into inorganic membrane materials based on zeolite, hydrophilic membrane materials mainly based on polyvinyl alcohol, chitosan, etc., and CS- TEOS organic-inorganic hybrid membrane material used in esterification reaction-pervaporation dehydration has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 3.0g chitosan (CS) is added in the acetic acid aqueous solution of 147g 2wt%, in 80 ℃ of water baths, stir until chitosan dissolves completely with the rotating speed of 500r / min, obtain the chitosan aqueous solution of 2wt% concentration, filter Finally, add 0.18g tetraethyl orthosilicate (TEOS), stir at room temperature for 2 hours, then let it stand for 20 minutes to defoam, and obtain the casting solution. After being ventilated and dried for 48 hours, it was heat-treated in an electric oven at 120° C. for 2 hours to prepare a CS-TEOS hybrid film (film 1) with an average film thickness of 50 μm. The membrane was used in the esterification reaction-pervaporation process to obtain a water permeation flux of 97.5g m -2 h -1 , The yield of ethyl lactate was 80.0wt%.

Embodiment 2

[0021] 3.0g chitosan (CS) is added in the acetic acid aqueous solution of 147g 2wt%, in 80 ℃ of water baths, stir until chitosan dissolves completely with the rotating speed of 500r / min, obtain the chitosan aqueous solution of 2wt% concentration, filter Finally, add 0.3g tetraethyl orthosilicate (TEOS), stir at room temperature for 2 hours, then let it stand for 20 minutes to defoam, and obtain the casting solution. Pour the casting solution on a clean plexiglass plate, scrape the film with a scraper, and heat After being ventilated and dried for 48 hours, heat treatment was carried out at 120° C. for 2 hours in an electric oven to prepare a CS-TEOS hybrid film (film 2), with an average film thickness of 50 μm. The membrane was used in the esterification reaction-pervaporation process to obtain a water permeation flux of 66.4g m -2 h -1 , the yield of ethyl lactate was 74.9wt%.

Embodiment 3

[0023] 3.0g chitosan (CS) is added in the acetic acid aqueous solution of 147g 2wt%, in 80 ℃ of water baths, stir until chitosan dissolves completely with the rotating speed of 500r / min, obtain the chitosan aqueous solution of 2wt% concentration, filter Finally, add 0.6g tetraethyl orthosilicate (TEOS), stir at room temperature for 2 hours, then let it stand for 20 minutes to defoam, and obtain the casting solution. After being ventilated and dried for 48 hours, it was heat-treated in an electric oven at 120° C. for 2 hours to prepare a CS-TEOS hybrid film (film 3) with an average film thickness of 50 μm. The membrane was used in the esterification reaction-pervaporation process to obtain a water permeation flux of 114.8g m -2 h -1 , the yield of ethyl lactate was 68.8wt%.

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Abstract

The invention relates to a permeable pervaporation membrane used in esterification and a preparation method thereof. The permeable pervaporation membrane employs chitosan and ethyl orthosilicate as raw materials which are matched according to the weight ratio between the chitosan and the ethyl orthosilicate is 10: 0.5-50:1. The preparation method is that the chitosan (CS) is dissolved into acetic acid hydrosolution and then is stirred in water bath of 80 DEG C, thus obtaining chitosan solution; the chitosan solution is filtered before the ethyl orthosilicate is added for stirring for 2 hours under room temperature, thus obtaining casting solution through stewing and deaerating; the casting film solution is ventilated and dried for 48 hours under 20-30 DEG C and is heat treated for 2 hours under 120 DEG C, thus obtaining CS-TEOS hybrid membranes. The invention has simple preparation, abundant raw materials and low cost; the CS-TEOS hybrid membranes being prepared can be used in the esterification for permeating and evaporating dehydration in coupling process to improve the yield of ethyl lactate, water permeable flux reaches 97.5g m<-2>h<-1> and the yield of the ethyl lactate is improved from 66.4 percent to 80.0 percent.

Description

technical field [0001] The present invention relates to pervaporation membrane preparation technology, in particular to a pervaporation membrane used for esterification and its preparation method, specifically to an organic-inorganic hybrid membrane used for dehydration in an esterification reaction-pervaporation coupled process and its preparation method. Background technique [0002] Ethyl lactate is an important fine chemical raw material. It is widely used in spices, spice synergists and alcohol additives in the food industry. It can be used to prepare food flavors, wine flavors and food flavoring flavor enhancers, and can also be used to prepare soft drinks. and alcoholic beverages. Because ethyl lactate contains asymmetric carbon atoms, it has two optical isomers, and it is also an important industrial solvent with optical activity. It can be used as nitrocellulose, cellulose acetate, alkyd resin, kauri ester, manila resin, rosin , shellac, vinyl resin, paint, etc., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/08C07C69/68C07C67/08B01D61/36
Inventor 姜忠义陆连玉陈雪李洁
Owner TIANJIN UNIV
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