Method for preparing drying agent by using eggshells

A desiccant and eggshell technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of desiccant products, avoid environmental pollution and waste, and have a wide range of raw materials , the effect of increasing the contact area

Inactive Publication Date: 2012-06-13
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It's just that there are no reports and products of desiccants prepared from eggshells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Eggshells, which are wastes in food production and daily life, are washed and soaked in NaOH solution with a concentration of 15 wt% to remove the inner membrane of the eggshells. The soaking time is about 3 days. Remove the eggshells and wash and dry. Place in a high temperature furnace and calcined at 900°C for 4 hours. After cooling, the powdered desiccant can be obtained, and the powder fineness is 20-30 mesh. Put it into a paper bag to get the eggshell desiccant. At 25°C, the quality of the finished product requires moisture to be less than 1.5%. Under the condition that the quality of the article remains unchanged, the moisture absorption rate is greater than 45%.

Embodiment 2

[0018] Eggshells, which are wastes in food production and daily life, are washed and soaked in NaOH solution with a concentration of 15 wt% to remove the inner membrane of the eggshells. The soaking time is about 3 days. Remove the eggshells and wash and dry. Place in a high temperature resistance furnace and calcined at 1000°C for 4 hours. After cooling, the powdered desiccant can be obtained, and the powder fineness is 30-40 mesh. Put it into a paper bag to get the eggshell desiccant. At 25°C, the quality of the finished product requires moisture to be less than 1.5%. Under the condition that the quality of the article remains unchanged, the moisture absorption rate is greater than 45%.

Embodiment 3

[0020] Eggshells, which are wastes in food production and daily life, are washed and soaked in NaOH solution with a concentration of 15 wt% to remove the inner membrane of the eggshells. The soaking time is about 3 days. Remove the eggshells and wash and dry. Place in a high temperature resistance furnace and calcined at 1200°C for 4 hours. After cooling, the desiccant in powder form can be obtained, and the powder fineness is 40-50 mesh. Put it into a paper bag to get the eggshell desiccant. At 25°C, the quality of the finished product requires moisture to be less than 1.5%. Under the condition that the quality of the article remains unchanged, the moisture absorption rate is greater than 45%.

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Abstract

The invention relates to a method for preparing a drying agent by using eggshells; the method comprises the following steps of: centralizing the eggshells to be cleaned, adding a NaOH solution with 15wt% of concentration to soak the eggshells so as to remove inner membranes of the eggshells, wherein soaking time is about 2-3days; taking out the eggshells, cleaning and drying the eggshells; placing the eggshells in a high temperature furnace, and burning the eggshells for 3-4 hours under the temperature of 900-1200 DEG C; obtaining white powdery calcium oxide after cooling, grinding the white powdery calcium oxide to obtain the calcium oxide powder with the fineness of 20-50 meshes; and bagging and sealing to obtain the drying agent. According to the method, the eggshells which are often discarded in food production process and in life are processed and recycled, thereby avoiding environmental pollution and waste caused by the long-term accumulation of the eggshells and also solving the problems that potential safety hazards exist when the drying agent circulates in the market and the source of raw materials for the traditional drying agent is limited. The drying agent is characterized by fast water absorption, high efficiency, safety, sanitation, non-foreign odor and long time of duration and can be widely applied to various occasions.

Description

technical field [0001] The invention belongs to natural mineral desiccant, in particular to a desiccant with high moisture absorption efficiency, strong adsorption capacity, no radioactivity, no environmental pollution and low preparation cost. At the same time, it involves waste residue treatment technology Background technique [0002] Desiccants, also known as dehumidifiers, usually use physical or chemical adsorption to absorb water vapor or moisture in a specific environment, keeping items relatively dry for a long time, regulating microbial survival and chemical reactions, photolysis reactions, and enzymes Moisture conditions that promote the reaction can achieve the purpose of moisture-proof, mildew-proof, insect-proof, rust-proof, anti-oxidation, prolonging the shelf life of products and maintaining the quality of articles. Therefore, desiccants are widely used in various fields such as food, medicine, and chemical industry. Traditional desiccants such as activated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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