Organic quicklime composite desiccant and preparation method thereof

A composite drying and quicklime technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as explosion, fire, uncontrollable heat with high reactivity, and achieve good safety, low cost, and moisture absorption effect. Good results

Active Publication Date: 2015-09-23
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydration reaction of calcium oxide will exotherm rapidly, and the high reactivity and uncontrollable heat generation of the hydration reaction often cause explosions and fires during storage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of an organic quicklime composite desiccant, comprising the steps of:

[0028] A), get 100 parts of unslaked lime powder that passes 150 mesh sieves and add in the high temperature and high pressure reactor and stir.

[0029] B) Take 5 parts of ethylene glycol and add it into a high-temperature and high-pressure reactor and stir it with quicklime powder to react evenly.

[0030] The air pressure in the high-temperature and high-pressure reactor is 1.2 atmospheres, the temperature is 120° C., and the reaction time is 3 hours. The reaction process is divided into three stages, the first stage is between 0-0.5h, the stirring rate is 500-750r / min, the second stage is 0.5-1.5 hours, the stirring rate is 200-500r / min, the third The stage is 1.5-3h, and the stirring rate is 20-200r / min; and the stirring rate of each reaction stage gradually decreases at a uniform speed.

[0031] C), after the reaction is completed, the obtained product is taken out and c...

Embodiment 2

[0035] A preparation method of an organic quicklime composite desiccant, comprising the steps of:

[0036] A), get 100 parts of unslaked lime powder that passes 80 mesh sieves and add in the high-temperature and high-pressure reactor and stir.

[0037] B) Take 10 parts of ethylenediamine and add it into a high-temperature and high-pressure reactor and stir it with quicklime powder to react evenly.

[0038] The air pressure in the high-temperature and high-pressure reactor is 2.0 atmospheres, the temperature is 150°C, and the reaction time is 2h. The reaction process is divided into three stages. The first stage is between 0-0.5h of reaction, and the stirring rate is 500- 750r / min, the second stage is 0.5-1.5 hours, the stirring rate is 200-500r / min, the third stage is 1.5-2h, the stirring rate is 20-200r / min; and the stirring rate of each reaction stage gradually decreases at a uniform speed.

[0039] C), after the reaction is completed, the obtained product is taken out and ...

Embodiment 3

[0043] A preparation method of an organic quicklime composite desiccant, comprising the steps of:

[0044] A), get 100 parts of unslaked lime powder that passes 80 mesh sieves and add in the high-temperature and high-pressure reactor and stir.

[0045] B) Take 3 parts of ethylene glycol and add it into the high temperature and high pressure reactor and stir it with quicklime powder to react evenly.

[0046]The air pressure in the high-temperature and high-pressure reactor is 1.1 atmospheres, the temperature is 110°C, and the reaction time is 6 hours. The reaction process is divided into three stages. The first stage is between 0-0.5 hours of reaction, and the stirring rate is 500- 750r / min, the second stage is 0.5-1.5 hours, the stirring rate is 200-500r / min, the third stage is 1.5-6h, the stirring rate is 20-200r / min; and the stirring rate of each reaction stage gradually decreases at a uniform speed.

[0047] In the second stage, butyllithium is added to the high-temperatur...

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Abstract

The invention relates to the field of desiccant preparation, and discloses an organic quicklime composite desiccant. The desiccant is granular, and formed by aggregating particles with core-shell structures; the core material of the particles is quicklime, and the shell material of the particles is polyethylene oxide polymerized on the surface of the quicklime particle; and the particle size of the desiccant is 2-5mm. The preparation method of the organic quicklime composite desiccant includes A) adding quicklime powder into a high temperature and high pressure reaction kettle, and stirring; B) adding ethylene glycol and ethylenediamine into the high temperature and high pressure reaction kettle, uniformly stirring with the quicklime powder, and reacting; and C) taking out the product and cooling to obtain the organic quicklime composite desiccant. The organic quicklime composite desiccant is good in moisture absorption effect, mild in reaction after absorbing water, and good in safety. The inventive preparation method is good in parameter homogeneity, simple in process and low in cost, and is suitable for mass production.

Description

technical field [0001] The invention relates to the field of desiccant preparation, in particular to an organic quicklime composite desiccant and a preparation method thereof. Background technique [0002] Quicklime, mainly composed of calcium oxide, chemical formula CaO, is a common inorganic compound; it is usually heated to 500–600°C by a substance containing calcium carbonate to decompose it into calcium oxide and carbon dioxide. The shape is white and amorphous. Widely used in desiccants. Used in iron and steel, pesticides, medicines, desiccants, tanning and alcohol dehydration, etc. Quicklime generally contains burnt lime, burnt lime is slow to slaking, if slaking occurs after the lime slurry is hardened, it will be swollen due to the expansion of slaking Cause swelling and cracking. Quicklime reacts chemically with water, and it is immediately heated to a high temperature exceeding 300°C. [0003] Since calcium oxide has a very high reactivity with water (hydratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28
Inventor 贺云建李韩闵凯彭志勤
Owner ZHEJIANG SCI-TECH UNIV
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