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Harmlessness treatment method for freon

A treatment method, freon technology, applied in the field of environmental engineering technology and chemical industry, can solve the problems of easy deactivation of catalysts, carbon deposition in equipment, residual chemical reagents, etc., to reduce production costs and operating costs, high conversion efficiency, simple process Effect

Inactive Publication Date: 2013-04-24
TONGJI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (CN200810058719.5) discloses a method for increasing the decomposition rate of Freon during combustion and hydrolysis of Freon, but the decomposition efficiency of CFCs cannot reach complete (98%), and dangerous secondary compounds will be produced; published patent (CN1049295) A catalytic decomposition method of chlorofluoroalkanes is described. This method not only has the problem of easy deactivation of the catalyst, but also needs to further improve the efficiency of the catalytic decomposition of Freon; the chemical reagent digestion method has the problem of dealing with residual chemical reagents; Chinese patent ( CN200810058719.5) discloses a harmless treatment method for freon decomposed by microwave plasma, the decomposition efficiency of freon can reach more than 99%, and a good effect has been achieved, but the method is prone to carbon deposition in equipment, and the stability of operation needs to be improved

Method used

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  • Harmlessness treatment method for freon

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Experimental program
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Effect test

Embodiment 1

[0029] In an autoclave hydrothermal reactor, Freon 12 (CF 2 Cl 2 , R12) for decomposition treatment, the oxidizing agent H 2 o 2 The addition rate is 60%, the molar ratio of NaOH and R12 is 5:1, placed in a SUS 316 hydrothermal tube reactor, and the water filling rate is controlled to be 35%. After the hydrothermal oxidation reaction was carried out at a temperature of 200° C. and a pressure of 20 MPa for 6 minutes, the reactor was quickly taken out, cooled with water, and the reaction was terminated. Quantitative analysis by HPLC showed that the decomposition rate of Freon reached 99.9%.

Embodiment 2

[0031] In an autoclave hydrothermal reactor, Freon 22 (CHF 2 Cl, R22) for decomposition treatment, the oxidizing agent H 2 o 2 The addition rate is 80%, the molar ratio of KOH and R12 is 6:1, placed in a SUS 316 hydrothermal tube reactor, and the water filling rate is controlled to be 35%. After the hydrothermal oxidation reaction was carried out at a temperature of 250° C. and a pressure of 26 MPa for 10 minutes, the reactor was quickly taken out, cooled with water, and the reaction was terminated. Quantitative analysis by HPLC showed that the decomposition rate of Freon reached 100%.

Embodiment 3

[0033] Using a continuous hydrothermal reactor, Freon 22 (CHF 2 Cl, R22) for decomposition treatment, the oxidizing agent H 2 o 2 The addition rate is 80%, the molar ratio of NaOH and R12 is 6:1, the temperature of the hydrothermal system is controlled at 200° C., and the pressure is 20 MPa to carry out continuous hydrothermal decomposition of Freon. HPLC analysis of the product showed that the decomposition rate of Freon reached 100%.

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Abstract

The invention relates to a harmless treatment method for freon. The method comprises the steps of (1) dissolving an alkali in water to obtain an alkali aqueous solution, then conveying the alkali aqueous solution, the freon and an oxidizing agent into a hydrothermal reactor respectively; (2) preheating the mixed reactants, performing a hydrothermal oxidizing reaction, controlling a reaction temperature to be 200-300 DEG C and a reaction pressure to be 6-30 MPa, a harmless product is obtained after the hydrothermal reaction is carried out for 5-20 minutes; and (3) cooling a reaction product to obtain carbonate and inorganic salts of fluorine and chlorine. The hydrothermal condition is helpful for fully mixing of the reactants, and facilitates rapid reaction. Compared with a conventional method, the method provided by the invention has the advantages of high speed and high efficiency for the harmless treatment of the freon and has wide application prospects in the fields of waste treatment and waste recycle.

Description

technical field [0001] The invention relates to the technical field of environmental engineering and the field of chemical industry, in particular to a method for realizing harmless Freon by utilizing hydrothermal reaction. Background technique [0002] Freons (CFCs) are "safe refrigerants" synthesized in the 1920s. It has many characteristics such as good chemical stability, easy phase change, non-corrosion and high insulation, so it is widely used in various fields of modern production and life. The CFCs emitted into the atmosphere are very stable in the troposphere and can exist stably for tens to hundreds of years. However, after they slowly rise into the stratosphere, they will be decomposed under the action of strong ultraviolet rays, and the chlorine atoms released by the decomposition are the same as ozone A chain reaction will occur, destroying the ozone molecules. According to scientific estimates, one chlorine atom can destroy tens of thousands of ozone molecule...

Claims

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Application Information

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IPC IPC(8): C01B31/24C01B9/02C01B9/08A62D3/36A62D101/22C01B32/60
Inventor 曹江林吴冰李光明贺文智金放鸣
Owner TONGJI UNIV
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