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A kind of preparation method of trifluoroethylene and tetrafluoromethane

A technology of tetrafluoromethane and trifluoroethylene, which is applied in the field of preparation of trifluoroethylene and tetrafluoromethane, can solve the problems of high equipment requirements and achieve the effect of improving the conversion rate

Inactive Publication Date: 2011-12-07
ZHEJIANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the corrosiveness of HF, the requirements for equipment are higher

Method used

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  • A kind of preparation method of trifluoroethylene and tetrafluoromethane
  • A kind of preparation method of trifluoroethylene and tetrafluoromethane
  • A kind of preparation method of trifluoroethylene and tetrafluoromethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, weigh Cr(NO 3 ) 3 and Al(NO 3 ) 3 , mix well with an appropriate amount of water, add a certain amount of ammonium carbonate to Cr 3+ and Al 3+ After the precipitation is complete, it is separated and washed until the solution is neutral, and then dried at 120°C for 12 hours. The dried precipitate was calcined at 400°C in an air atmosphere for 6 hours, and pressed into tablets to obtain the catalyst precursor (Cr 2 o 3 -Al 2 o 3 ), then use N 2 The gas was dried at 300°C for 5 hours, and then treated with anhydrous HF at 350°C for 5 hours to obtain a fluorination catalyst (Cr 2 o 3 -AlF 3 ).

[0031] refer to figure 1 : A certain amount of above-mentioned fluorination catalyst is added in the reactor I, press CFC-12 and HFC-134a molar ratio 1: 4, at temperature 450 ℃, normal pressure, space velocity 800h -1 The reaction is carried out under the following conditions; the gas after the reaction is separated by separation tower I, and the separated HFC...

Embodiment 2

[0034] First, weigh Cr(NO 3 ) 3 and Mg(NO 3 ) 2 , mix evenly with an appropriate amount of water, add a certain amount of ammonia water to make Cr 3+ and Mg 2+ After the precipitation is complete, it is separated and washed until the solution is neutral, and then dried at 150°C for 10 hours. The dried precipitate was calcined at 400°C in an air atmosphere for 6 hours, and pressed into tablets to obtain the catalyst precursor (Cr 2 o 3-MgO), then use N 2 The gas was dried at 300°C for 10 hours, and then treated with anhydrous HF at 400°C for 5 hours to obtain a fluorination catalyst (Cr 2 o 3 -MgF 2 )

[0035] refer to figure 1 : A certain amount of above-mentioned fluorination catalyst is added in the reactor I, press CFC-12 and HFC-134a molar ratio 1: 2, at temperature 450 ℃, normal pressure, space velocity 700h -1 The reaction is carried out under the following conditions; the gas after the reaction is separated by separation tower I, and the separated HFC-134a, ...

Embodiment 3

[0038] First, weigh Cr(NO 3 ) 3 and Y(NO 3 ) 3 , mix well with an appropriate amount of water, add a certain amount of ammonium carbonate to Cr 3+ and Y 3+ After the precipitation is complete, it is separated and washed until the solution is neutral, and then dried at 120°C for 10 hours. After the dried precipitate was shaped, it was baked at 600 ° C for 5 hours in a nitrogen atmosphere, and pressed into tablets, that is, to the catalyst precursor (Cr 2 o 3 -Y 2 o 3 ), then use N 2 The gas was dried at 400°C for 3 hours, and then treated with anhydrous HF at 450°C for 8 hours to obtain a fluorination catalyst (Cr 2 o 3 -YF 3 ).

[0039] refer to figure 1 : A certain amount of above-mentioned fluorination catalyst is added in the reactor I, press CFC-12 and HFC-134a molar ratio 1: 9, at temperature 500 ℃, normal pressure, space velocity 1500h -1 The reaction is carried out under the following conditions; the gas after the reaction is separated by separation tower ...

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Abstract

The invention relates to a preparation method for trifluoroethylene and tetrafluoromethane. The method is characterized in that: dichlorodifluoromethane and 1,1,1,2-tetrafluoroethane are mixed according to a mole ratio of the dichlorodifluoromethane to the 1,1,1,2-tetrafluoroethane of 1:2-9, and are subjected to a reaction at a temperature of 350-500 DEG C and space velocity of 700-1500 hour<-1> under normal pressure through a catalytic action of a fluorination catalyst; the resulting end gas is separated through a partition column I; the separated dichlorodifluoromethane, the separated fluoride hydrogen and the separated 1,1,1,2-tetrafluoroethane are separated through a partition column II, wherein the resulting dichlorodifluoromethane and the resulting 1,1,1,2-tetrafluoroethane are recycled, the resulting fluoride hydrogen is adopted as the by-product to be collected; the separated trifluoroethylene and the separated tetrafluoroethane are subjected to separation through a partition column III, and purification to obtain the pure trifluoroethylene and the pure tetrafluoroethane. The preparation method provided by the present invention has characteristics of low reaction temperature, low energy consumption and less damage to the equipment.

Description

technical field [0001] The invention relates to a chemical preparation method, in particular to a preparation method of trifluoroethylene and tetrafluoromethane. Background technique [0002] Trifluoroethylene (TrFE) is an important polymer monomer, and fluorine-containing resins with excellent properties can be obtained through homopolymerization or copolymerization. This type of fluorine-containing resin not only has the heat resistance stability, chemical resistance stability and ultraviolet resistance stability of fluorine-containing polymers, but also has the solubility and melt processability of conventional polymers, and also has ferroelectricity, Unique electrical properties such as piezoelectricity, pyroelectricity, and high dielectricity, so it has a wide range of application values ​​in electronics, military, medical and other industries. At the same time, it is also an important intermediate for the synthesis of many other compounds, such as trifluoroethylene and...

Claims

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Application Information

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IPC IPC(8): C07C19/08C07C21/18C07C17/20C07C17/25
CPCY02P20/584
Inventor 罗孟飞蔚辰刚贾文志谢冠群王月娟王树华周强鲁继青
Owner ZHEJIANG NORMAL UNIVERSITY
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