Modified silica gel air drying agent and preparation method thereof

A technology of air drying and silica gel, applied in the direction of separation methods, chemical instruments and methods, silicon compounds, etc., can solve the problems of capillary condensation adsorption, solid adsorption, fast drying air desiccant, etc., and achieve improved adsorption performance and adsorption rate , the effect of fast adsorption rate

Inactive Publication Date: 2011-02-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high relative humidity conditions, not only chemical reactions, but also solid adsorption and capillary condensation adsorption phenomena occur, so the dehumidification advantages of the composite dehumidification wheel are not so obvious
These existing silica gel modification methods cannot prepare air desiccants with high dehumidification rate, fast drying speed and easy regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Take 10 grams of silica gel with a drying temperature of 110°C and a drying time of 1 hour in glassware, add 100 ml of 1mol / L aluminum chloride solution and place it in a shaker with an ambient temperature of 20°C for 4 hours After that, take out the crude modified silica gel and dry it in an oven for 1 hour. After cooling to room temperature, take 10 grams of dried crude modified silica gel and place it in glassware, add 100 ml of 2mol / L zinc chloride solution and add Place it in an oscillator with an ambient temperature of 20°C and shake for 4 hours. After cooling to room temperature, place it in an oven with a drying temperature of 110°C to dry for 1 hour. After cooling to room temperature, the modified silica gel air desiccant is obtained.

[0033] 2. Take 5 grams of modified silica gel air desiccant and place it in a container with a relative humidity of 100%. After 30 hours of analysis, the water absorption rate of the modified silica gel air desiccant is 92%.

[00...

Embodiment 2

[0036] 1. Take 5 grams of silica gel with a drying temperature of 110°C and a drying time of 2 hours in a glassware, add 100 ml of 0.1 mol / L aluminum chloride solution and place it in a shaker at an ambient temperature of 40°C 3 After hours, take out the crude modified silica gel and dry it in an oven for 2 hours. After cooling to room temperature, take 5 grams of dried crude modified silica gel and place it in glassware, and add 100 ml of 3mol / L zinc chloride solution It was placed in an oscillator with an ambient temperature of 30°C and shaken for 3 hours. After cooling to room temperature, it was placed in an oven with a drying temperature of 110°C to dry for 2 hours. After cooling to room temperature, a modified silica gel air desiccant was obtained.

[0037] 2. Take 10 grams of modified silica gel air desiccant and place it in a container with a relative humidity of 80%, and analyze the water absorption rate of the modified silica gel air desiccant 85% after 35 hours.

[0038]...

Embodiment 3

[0040] 1. Take 20 grams of silica gel with a drying temperature of 110°C and a drying time of 2.5 hours in glassware, add 100 ml of 3mol / L aluminum chloride solution and place it in a shaker at an ambient temperature of 40°C for 2 hours , Then take out the crude modified silica gel and dry it in an oven for 4 hours. After cooling to room temperature, take 20 grams of dried crude modified silica gel and place it in glassware, and add 100 ml of 0.1 mol / L zinc chloride solution It was placed in an oscillator with an ambient temperature of 70°C and shaken for 2 hours. After cooling to room temperature, it was placed in an oven with a drying temperature of 110°C to dry for 2.5 hours. After cooling to room temperature, a modified silica gel air desiccant was obtained.

[0041] 2. Take 8 grams of modified silica gel air desiccant and place it in a container with a relative humidity of 60%, and analyze the water absorption rate of the modified silica gel air desiccant after 40 hours of 78...

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Abstract

The invention discloses a modified silica gel air drying agent and a preparation method thereof, belonging to the field of utilization of silica gel. The preparation method comprises the following steps: (A) putting dried silica gel into a container, adding an aluminum chloride solution, fully oscillating and mixing the silica gel and the aluminum chloride solution, and controlling the reaction temperature of a water bath at 20-40 DEG C to obtain crude modified silica gel; and (B) drying the crude modified silica gel in an oven, after cooling to room temperature, putting the crude modified silica gel into a container, adding a zinc chloride solution, fully oscillating and mixing the silica gel and the zinc chloride solution, controlling the reaction temperature of the water bath at 20-70 DEG C, and after cooling to room temperature, taking out and drying to obtain the modified silica gel air drying agent. Compared with the unmodified silica gel drying agent, the absorbability of the modified silica gel drying agent of the invention is obviously improved. The modified silica gel air drying agent of the invention has the characteristics of high absorption capacity, quick absorption rate, easy desorption and regeneration and the like, and has great application and popularization prospects.

Description

[0001] technical field [0002] The invention relates to an air desiccant and a preparation method thereof, in particular to a modified silica gel air desiccant and a preparation method thereof. Background technique [0003] Desiccant occupies a very important position in daily life and industrial production. It is the most commonly used material for industrial and civil moisture-proof packaging. At present, there are no less than a hundred kinds of desiccant products developed in the world, including silica gel, quicklime, inorganic Salt, charcoal, montmorillonite, natural minerals, etc. [0004] Many foods and articles absorb moisture and become moldy due to suitable desiccants. Biscuits, instant noodles, solid drinks, Chinese and Western medicines absorb moisture and oxidize and deteriorate. Excessive humidity will have a serious impact on human comfort, which has caused great harm to the national economy. Big loss. [0005] However, the inorganic and organic desiccant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28B01J20/32B01J20/10
Inventor 李磊邢志强张雪英
Owner NANJING UNIV OF TECH
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