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Efficient complex wet gel solvent replacement method

A wet gel and complex technology, which is applied in the field of complex wet gel preparation, can solve the problems of rough and simple replacement methods, high consumption of organic solvents, and agglomeration between microscopic particles, so as to shorten the replacement time and improve the effect , the effect of reducing consumption

Inactive Publication Date: 2017-07-28
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This washing organic solvent replacement method takes less time, but consumes a lot of organic solvents, and it is more difficult to remove the water in the hydrogel, which cannot meet the requirements of the subsequent drying process, resulting in serious agglomeration between microscopic particles
[0009] The above two commonly used organic solvent replacement methods are relatively rough and simple, resulting in unsatisfactory results of subsequent drying work, and it is difficult to meet the precise and accurate requirements of today's material preparation.

Method used

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  • Efficient complex wet gel solvent replacement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Strontium cobalt iron oxide and citric acid complex gel are used as raw materials, and absolute ethanol is used as the replacement solvent. The main equipment required in the process: 1 heat-collecting magnetic stirring water bath, 1 magnetic stirring bar, 100ml beaker 1, 1 glass stirring rod.

[0029] The specific operation process and phenomena are as follows:

[0030] 1) Put a total of 15ml of strontium cobalt iron oxide and citric acid complex gel into a 100ml beaker. Stir the wet gel, when the liquid level of the wet gel no longer drops with time and heating and stirring, a preliminary wet gel is formed;

[0031] 2) Add absolute ethanol below 20°C to the wet gel in step 1) to 85ml of the beaker, and continue magnetic stirring for 30min. During this process, add absolute ethanol continuously to keep the liquid level higher than 60ml;

[0032] 3) Remove the beaker from the water bath, remove the residual absolute ethanol on the upper layer of the wet gel in step 2)...

Embodiment 2

[0037] Using strontium cobalt iron oxide and citric acid complex gel as raw materials, acetone as replacement solvent, the main equipment needed in the process: 1 heat-collecting magnetic stirring water bath, 1 magnetic stirring bar, 1 100ml beaker , 1 glass stirring rod.

[0038] The specific operation process and phenomena are as follows:

[0039] 1) Put a total of 15ml of strontium cobalt iron oxide and citric acid complex gel into a 100ml beaker, place the beaker in a heat-collecting magnetic stirring water bath at 15°C, put the magnetic stirring bar into the beaker, and magnetically Stir the wet gel, when the liquid level of the wet gel no longer drops with time and heating and stirring, a preliminary wet gel is formed;

[0040] 2) Add acetone below 20°C to the wet gel in step 1) to 85ml of the beaker, and continue magnetic stirring for 30min;

[0041] 3) Remove the beaker from the water bath, remove the residual acetone on the upper layer of the wet gel in step 2), add...

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Abstract

The invention discloses an efficient complex wet gel solvent replacement method. The method includes: adopting a combination of heating stirring and cooling replacement; after the circumstance that wet gel is formed is observed, using an organic solvent with surface tension lower than that of water to fully replace moisture in the wet gel by heating, stirring and strictly controlling temperature. The method greatly shortens replacement time of a complex gel solvent, improve effect of a solvent replacement method and reduce consumption of a replacement solvent and other energy resources and is high in efficiency, good in effect and resource-saving.

Description

technical field [0001] The invention relates to the technical field of complex wet gel preparation, in particular to an efficient complex wet gel solvent replacement method. Background technique [0002] The solvent replacement drying method is to replace the solvent water (including water / organic solvent after washing and filtering) in the product prepared by the liquid phase method with an organic solvent (including liquid CO2 or supercritical CO2) before drying, and then use appropriate An operation method for obtaining nanomaterial products by drying method. [0003] When preparing nanopowder by wet chemical method, it is necessary to wash with water several times in the pretreatment process such as filtration before drying to remove various impurity ions remaining in the liquid phase as much as possible. In the process, it will inevitably cause agglomeration between powder particles. Because the solvent replacement of the gel is often required in the subsequent drying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D12/00
CPCB01D12/00
Inventor 张鑫邵烨平王松伟赵中康杨孟孟白洋
Owner GUILIN UNIV OF ELECTRONIC TECH
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