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Solvent-substitution solvent used in aerogel production, and hydrophobised aerogel production method using same

A technology for replacing solvents and aerogels, applied in chemical instruments and methods, silica, inorganic chemistry, etc., can solve the problems of low quality of butanol solvent, butanol loss, etc. , the effect of high porosity

Active Publication Date: 2015-02-04
中科高新材料(南通)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed treatment method inevitably results in the loss of butanol, and even the collected butanol solvent is of low quality because a relatively large amount of water may be dissolved therein

Method used

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  • Solvent-substitution solvent used in aerogel production, and hydrophobised aerogel production method using same
  • Solvent-substitution solvent used in aerogel production, and hydrophobised aerogel production method using same
  • Solvent-substitution solvent used in aerogel production, and hydrophobised aerogel production method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] 25% by weight of water glass (sodium silicate) was added to 1 L of 2N hydrochloric acid at room temperature until pH 4 was obtained, and due to the reaction between sodium silicate and hydrochloric acid, wet gel beads were formed. The wet gel beads were washed with distilled water and filtered to remove impurities. 300 g of wet gel beads were inserted into the reactor, and 300 g of n-pentanol (an industrial product with a purity of 90% by weight to 95% by weight) was mixed with the wet gel beads. Then, by the reflux distillation method, by using a heating mantle to heat the reactor until the liquid boils, the stratified water is discharged through the lower valve, while the vapor rising from the boiling liquid is condensed using a condenser, and the reaction liquid mixture (solvent-displacing solvent ) was introduced back into the reactor (if the pressure drops to 30 mmHg, it takes about 40 minutes), and the mixture was allowed to react at atmospheric pressure for 5 hou...

Embodiment 2

[0116] 25% by weight of water glass (sodium silicate) was added to 1 L of 2N hydrochloric acid at room temperature until pH 4 was obtained, and due to the reaction between sodium silicate and hydrochloric acid, wet gel beads were formed. The wet gel beads were washed with distilled water and filtered to remove impurities. Separately, about 3500 g of n-pentanol (an amount for 7 uses) was prepared. 300 g of silica wet gel beads were added to 440 g of n-amyl alcohol (solvent), and the resulting mixture was inserted into a mixer and stirred at room temperature at about 7500 rpm for about 5 minutes. After this time, the mixture was filtered and the water layered down in the filtrate was removed. Then, the upwardly layered solvent in the filtrate was stored separately. The solid phase silica material remaining after filtration was mixed with 440 g of n-amyl alcohol solvent and stirred in a mixer at about 7500 rpm for about 15 minutes. Then, the resulting mixture was filtered to o...

Embodiment 3

[0118]25% by weight of water glass (sodium silicate) was added to 2 L of 1N hydrochloric acid at room temperature until pH 6 was obtained, and due to the reaction between sodium silicate and hydrochloric acid, wet gel beads were formed. The wet gel beads were washed with distilled water and filtered to remove impurities. 300 g of wet gel powder was inserted into the reactor, and 300 g of n-amyl alcohol (an industrial product with a purity of 90% by weight to 95% by weight) was mixed with the wet gel powder. Then, by the reflux distillation method, by using a heating mantle to heat the reactor until the liquid boils, the stratified water is discharged through the lower valve, while the vapor rising from the boiling liquid is condensed using a condenser, and the reaction liquid mixture (solvent-displacing solvent ) was introduced back into the reactor (if the pressure drops to 30 mmHg, it takes about 40 minutes), and the mixture was allowed to react at atmospheric pressure for 5...

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Abstract

The present invention relates to a solvent-substitution solvent used in hydrophobised aerogel production, and to a hydrophobised aerogel production method using same. According to one embodiment, the present invention provides a solvent-substitution solvent for aerogel production comprising between 41 and 100 wt.% of pentane and between 0 and 59 wt.% of n-butane, and provides a hydrophobised aerogel production method comprising a step involving solvent substitution by means of the solvent-substitution solvent. By subjecting a wet gel to solvent substitution and / or hydrophobisation in an aerogel production process using the solvent-substitution solvent of one embodiment of the present invention, not only is the water (water fraction) in the wet gel effectively substituted by the solvent-substitution solvent but also the solvent-substitution solvent can be recovered easily and to a high degree of purity and so can be reused as required. Consequently, solvent loss is minimised. Also, by carrying out solvent substitution using the solvent-substitution solvent, a hydrophobised aerogel is obtained even without a hydrophobisation process using a separate hydrophobisation agent such as a silylating agent.

Description

technical field [0001] The present invention relates to a solvent-displacement solvent for producing a hydrophobized aerogel and a method of producing a hydrophobized aerogel using the solvent-displacement solvent. More specifically, the present invention relates to a solvent-displacing solvent for making hydrophobized aerogels while allowing easy collection of the solvent and reuse of the solvent to minimize solvent loss, allowing easy control of the silylating agent content, allowing to effectively replace the moisture of the wet gel, and allowing the porosity of the lyogel to be maintained at a high quality level during drying, and a method involving the use of the solvent-displacing solvent to make a hydrophobized aerogel. Background technique [0002] With recent advances in the field of advanced industrial technology, there is increasing interest in aerogels. Airgel is an advanced ultra-low density material with a porosity of 90% or more and a specific surface area of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/125C01B33/152C01B33/14
CPCC01B33/14C01B33/152C01B33/155C01B33/1585C07C31/125
Inventor 金炳勋俞正根韩廷昊罗珊·韦格尔
Owner 中科高新材料(南通)有限责任公司
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