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Method for improving Freon decomposition rate during process for burning and hydrolyzing Freon

A decomposition rate, Freon technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as unseen decomposition of Freon, reduce time, reduce energy consumption, and improve decomposition rate. Effect

Inactive Publication Date: 2008-12-17
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on the catalytic decomposition of Freon using molten salt as a heat carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Take commercially available Freon-12 as an example. For Freon-12, m, n, and p in formula (a) are 1, 0, and 4 respectively, and formula (a) is:

[0024] CCl 2 f 2 +2H 2 O→CO 2 +2HF+2HCl

[0025] Select crystalline KNO with a particle size of 200-300 μm 3 、NaNO 3 , AlCl 3 , Ca(NO 3 ) 2 and KCl as a low-temperature molten salt formulation according to KNO 3 : NaNO 3 :AlCl 3 : Ca(NO 3 ) 2 : KCl = 25.6: 47.2: 6.2: 5.6: 15.4 weight ratio mixed evenly and then put into the reactor, heating the reactor to 370 ℃ ~ 380 ℃, so that the molten salt is completely in a molten state, wherein the volume ratio of Freon to water vapor It is 1:2, and the gas flow rate of Freon is determined to be 250mm according to the processing capacity range of the reactor. 3 / min, the steam flow rate is 500mm 3 / min, first pass into the gas mixer, then directly pass into the reactor after coming out of the gas mixer, complete the decomposition of freon after 2min, measure ...

Embodiment 2

[0026] Embodiment 2: Take commercially available Freon-13 as an example. For Freon-13, m, n, and p in formula (a) are 1, 0, and 4 respectively, and formula (a) is:

[0027] CCIF 3 +2H 2 O→CO 2 +3HF+HCl

[0028] Select crystalline KNO with a particle size of 50-150 μm 3 、NaNO 3 , AlCl 3 , Ca(NO 3 ) 2 , KCl as the formulation of low-temperature molten salt, the melting point of these molten salts is between 180°C and 350°C, according to KNO 3 : NaNO 3 :AlCl 3 : Ca(NO 3 ) 2: KCl = 23.4: 50.9: 5.2: 7.2: 13.3, mix it evenly, put it into the reactor, and heat the reactor to 380°C-400°C, so that the molten salt is completely in a molten state, and the volume ratio of Freon to water vapor It is 1:2, and the gas flow rate of Freon is determined to be 250mm according to the processing capacity range of the reactor. 3 / min, the steam flow rate is 500mm 3 / min, first pass into the gas mixer, then directly pass into the reactor after coming out of the gas mixer, complete the...

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Abstract

The invention relates to a method for increasing decomposing velocity of Freon in the processes of burning and hydrolyzation of the Freon, pertaining to the technical field of poisonous and harmful waste-gas purifying. Fuse salt is adopted as a heat carrier and crystals KNO3, NaNO3, AlCl3, Ca (NO3) 2 and KCl that have the granularity of 50 micron to 300micron are selected as heat carriers of the fuse salt and are put into a reactor according to proportion by weight after being evenly mixed, the reactor is heated to 350 DEG C to 500 DEG C so as to ensure that the fuse salt is completely in the melting state. The Freon, vapor and oxygen are pumped to the reactor and the Freon quickly decomposes in the existence of the vapor and at the comparatively low temperature. The decomposing rate of the Freon is more than 98 percent and by adopting the method, the temperature and the time required by the Freon decomposition as well as the energy consumption are reduced.

Description

1. Technical field [0001] The invention relates to a method for increasing the decomposition rate of freon in the process of freon combustion and hydrolysis, and belongs to the technical field of toxic and harmful waste gas purification. 2. Background technology [0002] Freon (CFCs) is a large-scale industrial production of compounds containing four elements of fluorine, chlorine, carbon, and hydrogen or only three elements of fluorine, chlorine, and carbon. Its chemical properties are very stable, non-toxic or low-toxic, and non-corrosive Non-combustible, mostly non-flammable, widely used in refrigerants, foaming agents, sprays, cleaning agents and other fields. However, it is precisely because of their excellent stability that they are difficult to degrade after being discharged into the atmosphere. When they rise to the stratosphere, they will produce catalytic species that can decompose ozone molecules under the action of ultraviolet rays, destroying ozone by about 100,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/35A62D3/38B01J27/25B01J27/10A62D101/22
Inventor 马林转卿山李茂林
Owner YUNNAN MINZU UNIV
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