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Deep drying and dewatering method

A drying and deep technology, applied in the direction of drying solid materials, drying solid materials without heating, drying, etc., can solve the problems of battery performance impact and harm, and achieve the effect of improving the drying effect, not easy to residue, and easy to remove moisture

Active Publication Date: 2014-06-18
VIGOR GAS PURIFICATION TECHNOLOGIES (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if you do not enter the liquid injection workshop immediately, the water content will become higher due to the absorption of moisture in the air, which is far from the requirement that the water content of the lithium battery electrolyte is less than 30ppm, which will greatly affect the performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1, taking the application of battery core drying in the lithium battery industry as an example

[0018] Heat the battery core to 50°C in the oven, vacuumize, and pass a certain amount of methanol. Methanol exists in the form of gas in the vacuum environment, and quickly and fully contacts the surface of the dried battery core, and fills the gap between the battery core and the inside of the battery core. Part of the water molecules are replaced by methanol gas molecules to the outside of the battery core, and then vacuumized for more than 10 minutes to remove the mixture of methanol and water, and the methanol can be recycled and reused. Repeat the above operations until the drying effect is satisfactory, then heat to above 65°C and purge with dry high-purity inert gas to remove excess methanol.

[0019] The drying effect varies with different materials. According to the Karl Fischer Coulometer test, the water content of the battery cells dried by this method is...

Embodiment 2

[0021] Heat the battery core to 70°C in the oven, vacuumize, and pass a certain amount of ethanol. The ethanol exists in the form of gas in the vacuum environment, and quickly and fully contacts the surface of the dried battery core, and fills the gap between the battery core and the inside of the battery core. Part of the water molecules are replaced by ethanol gas molecules to the outside of the battery core, and then vacuumed for more than 30 minutes to remove the mixture of ethanol and water, and the ethanol can be recycled and reused. Repeat the above operations until the drying effect is satisfactory, then heat to above 78°C and purge with dry high-purity inert gas to remove excess ethanol.

[0022] According to the Karl Fischer coulometer test, the moisture content of the battery cells dried by this method is basically less than 100ppm depending on the material of the battery cells.

Embodiment 3

[0023] Example 3, taking the application of transformer insulation fiber drying in the electrical industry as an example

[0024] Heat the insulating fiber to 50°C in the oven, vacuumize, and pass a certain amount of methanol. Methanol exists in the form of gas in the vacuum environment, and quickly and fully contacts the surface of the dried insulating fiber, and fills the gap between the insulating fiber and the battery core. Part of the water molecules are replaced by methanol gas molecules to the outside of the battery core, and then vacuumed for more than 2 minutes to remove the mixture of methanol and water, and the methanol can be recycled and reused. Repeat the above operations until the drying effect is satisfactory, then heat to above 65°C and purge with dry high-purity inert gas to remove excess methanol.

[0025] The drying effect varies with different materials. According to the Karl Fischer coulometer test, the moisture content of the insulating fibers dried by t...

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PUM

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Abstract

The invention provides a deep drying and dewatering method of solid materials. The method includes the following steps that firstly, drying reagents which are lower than water in polarity, surface tension and boiling point are fed into a container where dried objects are placed; secondly, after the drying reagents are fed in, the container is vacuumized; thirdly, inert gas with high purity and for drying is fed into the container to remove residual drying reagents. By means of competitive adsorption of the drying reagents and water on surfaces of dried materials, hydrone on the surfaces of the dried materials is displaced, accordingly, the drying effect on the solid materials is greatly improve, a better dewatering effect is realized, drying can be carried out more thoroughly, higher requirements for the drying effect of certain industries can be met, and especially production bottlenecks caused by the fact the requirement for water is very high in industries such as lithium electricity industry can be broken; according to the method, energy is saved, the environment is protected, toxic substances cannot be produced, and the method is free from pollution, environmentally friendly and efficient.

Description

technical field [0001] The invention relates to the field of drying, in particular to a solid deep drying and water removal method. Background technique [0002] At present, in the field of drying, heating, decompression and freezing are often used to dry solids. The most common methods are ovens, vacuum ovens, etc., and vacuum ovens have better drying effects. The application process of the vacuum oven is to place the dry material in a closed drying room, and heat the material to be dried while vacuuming with a vacuum system, so that the moisture inside the material diffuses to the surface through the pressure difference or concentration difference, and the water molecules in the material The surface obtains sufficient kinetic energy, and after overcoming the mutual attraction between molecules, it escapes to the low-pressure space of the vacuum chamber and is thus sucked away by the vacuum system. During the vacuum drying process, the pressure in the drying chamber is alw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B5/16F26B5/04
Inventor 李春风
Owner VIGOR GAS PURIFICATION TECHNOLOGIES (SUZHOU) CO LTD
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