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Preparation method of calcium oxide with high specific surface area

A high specific surface area, calcium oxide technology, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve the problems of poor water absorption effect and small specific surface area, and achieve strong hygroscopicity, The effect of large specific surface area and high specific surface area

Active Publication Date: 2020-02-11
JIUJIANG CSSC CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium oxide obtained by calcining rocks generally has a relatively small specific surface area, and the water absorption effect is not good.

Method used

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  • Preparation method of calcium oxide with high specific surface area
  • Preparation method of calcium oxide with high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides a method for preparing a calcium oxide desiccant with a high specific surface area, which specifically includes the following steps:

[0028] (1) Weigh 28.3g calcium nitrate tetrahydrate and dissolve it in 1.2L distilled water to obtain a calcium nitrate solution; weigh 30.3g monohydrate citric acid and dissolve it in 1.44L distilled water. After the monohydrate citric acid is completely dissolved, the lemon Slowly add the acid solution into the calcium nitrate solution, and pay attention to stirring during the dropping process so that the two solutions are mixed evenly. After the dropwise addition is completed, the initial pH of the mixed solution is <1, and concentrated ammonia water is added dropwise to the mixed solution to adjust the pH value to 3;

[0029] (2) Evaporating and concentrating the mixed solution in a water bath at 70°C until the mixed solution is viscous and colloidal;

[0030] (3) When the mixed solution is in the form of a ...

Embodiment 2

[0036] This embodiment provides a method for preparing a calcium oxide desiccant with a high specific surface area, which specifically includes the following steps:

[0037] (1) Weigh 28.3g calcium nitrate tetrahydrate and dissolve it in 0.5L distilled water; weigh 8.65g urea and dissolve it in 0.5L distilled water. After the urea is completely dissolved, slowly add the urea solution dropwise into the calcium nitrate solution. Pay attention to stirring in the middle, and the two solutions are mixed evenly. After the dropwise addition, the initial pH of the mixed solution is <1, and an appropriate amount of concentrated ammonia water is added dropwise to the mixed solution to adjust the pH value to 2;

[0038] (2) Evaporate and concentrate the mixed solution in a water bath at 60°C until the mixed solution is in the form of a viscous colloid;

[0039] (3) When the mixed solution is in the form of a viscous colloid, move it to a vacuum drying oven and dry at 100°C to form a xer...

Embodiment 3

[0045](1) Weigh 28.3g calcium nitrate tetrahydrate and dissolve it in 0.5L distilled water; weigh 10.78g glycine and dissolve it in 0.5L distilled water. After the glycine is completely dissolved, slowly drop the glycine solution into the calcium nitrate solution with a dropping funnel , pay attention to stirring during the dropwise addition, so that the two solutions are mixed evenly. After the dropwise addition is completed, the initial pH of the mixed solution is <1, and at this time, an appropriate amount of concentrated ammonia water is added dropwise to the mixed solution to adjust the pH value to 4;

[0046] (2) Evaporating and concentrating the mixed solution in a water bath at 80°C until the mixed solution is viscous and colloidal;

[0047] (3) When the mixed solution is in the form of a viscous colloid, move it to a vacuum drying oven and dry at 105°C to form a xerogel;

[0048] (4) Place the dry gel in a muffle furnace, and bake it at 220°C for 55 minutes under a n...

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Abstract

The invention discloses a preparation method of calcium oxide with a high specific surface area, and relates to the technical field of drying agents. The preparation method comprises: (1) preparing amixed solution from a calcium salt and a chelating agent, and adjusting the pH value to 2-5; (2) evaporating and concentrating at a temperature of 60-100 DEG C; (3) drying at a temperature of 100-120DEG C; (4) roasting for 0.5-1 h at a temperature of 200-270 DEG C under the protection of nitrogen; (5) carrying out pressing molding; and (6) roasting at a temperature of 270-400 DEG C for 3-7 h. Theinvention further discloses a calcium oxide drying agent prepared by the method. According to the invention, the calcium oxide prepared by the method has characteristics of high specific surface areaand porosity, so that the calcium oxide has strong hygroscopicity.

Description

technical field [0001] The invention relates to the technical field of desiccants, in particular to a calcium oxide desiccant with high specific surface area and a preparation method thereof. Background technique [0002] A desiccant is a dehydrating agent that absorbs moisture from the atmosphere. It physically absorbs water molecules in its own structure or chemically absorbs water molecules and changes its chemical structure to become another substance. It is suitable for preventing moisture in instruments, meters, electrical equipment, medicines, food, textiles and other various packaging items. During transportation, goods are often affected by moisture and deteriorate due to high temperature, and electronic products are also prone to metal oxidation, resulting in poor performance. The use of desiccant is to avoid the occurrence of poor product quality caused by excess moisture. [0003] Calcium oxide desiccant is widely used in packaged food due to its good drying ef...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/28B01J20/30B01D53/28
CPCB01J20/041B01J20/28054B01D53/28B01D53/261B01D2257/80Y02C20/40
Inventor 韩亚军黄志翔马伟伟张兰兰黄彩刘贤林
Owner JIUJIANG CSSC CHEM TECH
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