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A Simple Method for Resource Utilization of Chlorofluorocarbons

A technology of resource utilization and chlorofluorocarbons, which is applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of complex processing process and non-utilization of industrial applications, and achieve the effect of improving the safety factor

Active Publication Date: 2018-12-28
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method takes into account the safety of trifluoroethylene, the reaction product of the first step is quickly entered into the second reactor and reacted with bromine, which reduces the risk to a certain extent, but there is still a problem of premature self-polymerization of trifluoroethylene. possibility, and the follow-up treatment process is relatively complicated, and liquid bromine is also a highly dangerous chemical, which is also not used in industrial applications

Method used

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Examples

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preparation example Construction

[0032] Preparation of catalyst: Dissolve 100g of chromium chloride in 1L of water, add 3.6g of Al(NO 3 ) 3 Mix and prepare a mixed salt solution, then add ammonia water to the mixed salt solution to react, adjust the pH value of the reaction to maintain between 8.5-10, fully precipitate under the condition of constant stirring, then filter and dry to obtain chromium-containing hydrogen Mixed precipitation of oxide and aluminum hydroxide; roast the mixed precipitation at 600°C to obtain a catalyst containing oxides of chromium and aluminum, referred to as Cr-Al-based gas-phase catalyst.

[0033] Add 100ml of Cr-Al catalyst to a 1000mm long Φ46×3 nickel tube, and dry it at 120°C for 12 hours under the protection of nitrogen and other inert gases; preheat 200ml of hydrogen fluoride gas to 80°C and pass it with 200ml of nitrogen into the reaction tube, keep the mixed gas heated up to 300°C at a rate of 10°C / h, and activate the catalyst at 300°C for 48 hours; after the activation ...

Embodiment 1

[0035] A simple and convenient method for resource utilization of chlorofluorocarbons comprises the following steps:

[0036] (1) Mix 1,1,1,2-tetrafluoroethane and dichloromethane at a volume ratio of 1:0.8, react for 4s under a Cr-Al-based gas-phase catalyst, control the reaction temperature at 450°C, and space velocity at 800h -1 , the pressure is 0.15Mpa, and the mixed gas is obtained;

[0037] (2) After the mixed gas reacted in step (1) is cooled by heat exchange, it enters the quencher, and then washed with water, washed with alkali, dried, and then the tail gas is collected for chromatographic analysis.

[0038] Chromatographic analysis, the conversion rate of 1,1,1,2-tetrafluoroethane can reach 46%, the conversion rate of dichloromethane is 80%, and the selectivity of 1,1,2-trifluoro-1,3-dichloropropane is 86% .

Embodiment 2

[0040] A simple and convenient method for resource utilization of chlorofluorocarbons comprises the following steps:

[0041] (1) Mix 1,1,1,2-tetrafluoroethane and dichloromethane at a volume ratio of 1:0.8, react for 4s under a Cr-Al-based gas-phase catalyst, control the reaction temperature at 475°C, and space velocity at 800h -1 , the pressure is 0.15Mpa, and the mixed gas is obtained;

[0042] (2) After the mixed gas reacted in step (1) is cooled by heat exchange, it enters the quencher, and then washed with water, washed with alkali, dried, and then the tail gas is collected for chromatographic analysis.

[0043] Chromatographic analysis, the conversion rate of 1,1,1,2-tetrafluoroethane can reach 53%, the conversion rate of dichloromethane is 83.6%, and the selectivity of 1,1,2-trifluoro-1,3-dichloropropane is 88% .

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Abstract

The invention relates to a resource utilization method of chlorofluorocarbons. Halogenated ethane and halogenated methane are adopted as raw materials in the method. The method includes reacting under actions of a catalyst, cooling through heat exchange, washing with water, washing with an alkali, drying, compressing, condensing and liquefying, and rectifying to separate halogenated propane. In the method, fluorochloroethylene or fluoroethylene prepared by removing HF from fluorochloroethane or fluoroethane is directly reacted with the halogenated methane, thus avoiding separation of the fluorochloroethylene or the fluoroethylene which is high in dangerousness. The conversion ratios of the halogenated ethane and the halogenated methane are high. Selectivity and the yield of the halogenated propane that is a main product are high. The halogenated propane can be used for preparing pentafluoropropane, tetrafluoropropene, and the like, and has important economic value.

Description

technical field [0001] The invention relates to a simple method for resource utilization of chlorofluorocarbons, belonging to the field of resource utilization of harmful gases. Background technique [0002] 1,1,1,2-Tetrafluoroethane, 1,1,1-Trifluoroethane, etc. have a greater impact on global warming due to their high greenhouse effect potential (GWP), so the Kyoto Protocol List such HFCs as species to be phased out within a time limit. In recent years, the international community has formulated regulations and policies to restrict the use of HFCs with a high GWP value and phase them out. Among them, the European Union has banned the use of refrigerants with a GWP value higher than 150 in the air conditioners of all new vehicles since January 1, 2017. ; Split-type household air conditioners, since January 1, 2015, the use of refrigerants with a GWP value higher than 150 is prohibited. The use of R134a is banned in the air conditioners of new cars produced after 2021 in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/278C07C19/10
CPCC07C17/25C07C17/278C07C19/10C07C21/18
Inventor 王伟丁晨王鑫孙森都荣礼韩春华徐强张星全
Owner SHANDONG DONGYUE CHEM
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