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Method for preparing vinylidene fluoride by resource conversion of trifluoromethane

A technology of trifluoromethane and vinylidene fluoride, which is applied in the field of resource conversion of trifluoromethane to prepare vinylidene fluoride, which can solve the problems of low yield, low selectivity of the target product vinylidene fluoride, poor thermal stability of the catalyst, etc. Low temperature, good high temperature resistance, high selectivity effect

Pending Publication Date: 2020-06-02
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can react trifluoromethane with methane and oxygen at a temperature of 700°C, the selectivity of the target product vinylidene fluoride is low and the yield is low, and the catalyst must be pretreated with trifluoromethane at high temperature before use.
In order to improve the activity of the catalyst, the reaction temperature is increased to 800°C in this method. When the reaction temperature is 800°C, although the catalyst activity is improved to a certain extent, the thermal stability of the catalyst is very poor.

Method used

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  • Method for preparing vinylidene fluoride by resource conversion of trifluoromethane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: catalyst preparation

[0036] Dissolve 58.8g of barium nitrate and 10.8g of lanthanum nitrate (the molar ratio of barium to lanthanum is Ba:La=9:1) in 500ml of distilled water, heat and stir in a water bath at 80°C, and slowly add diluted Hydrofluoric acid solution, keep the ratio of fluoride ion to metal ion (the sum of barium ion and lanthanum ion) at 22.5, stir vigorously while adding hydrofluoric acid solution, when the hydrofluoric acid solution is added dropwise, no white precipitate will appear , after it was filtered and washed twice with water, a white precipitate was obtained. Transfer the obtained white precipitate to a blast drying oven at 100°C for 12 hours. After the residual liquid is completely removed, place it in a muffle furnace, raise the temperature to 800°C at a rate of 2°C / min and keep it for 2 hours, then The composite barium lanthanum fluoride catalyst is obtained after self-cooling.

Embodiment 2

[0037] Embodiment 2: catalyst preparation

[0038] Dissolve 51g of barium nitrate and 21.5g of lanthanum nitrate (the molar ratio of barium to lanthanum is Ba:La=4:1) in 500ml of distilled water, heat and stir in a water bath at 80°C, and slowly add diluted hydrogen to the barium and lanthanum mixture The hydrofluoric acid solution keeps the ratio of fluoride ion to metal ion (the sum of barium ion and lanthanum ion) at 22.5, and stirs vigorously while adding the hydrofluoric acid solution. After it was filtered and washed twice with water, a white precipitate was obtained. Transfer the obtained white precipitate to a blast drying oven at 100°C for 12 hours. After the residual liquid is completely removed, place it in a muffle furnace, raise the temperature to 800°C at a rate of 2°C / min and keep it for 2 hours, then The composite barium lanthanum fluoride catalyst can be obtained by lowering the temperature by itself.

Embodiment 3

[0039] Embodiment 3: catalyst preparation

[0040] First take 39g of barium nitrate and 43.3g of lanthanum nitrate and dissolve them (the molar ratio of barium to lanthanum is Ba:La=3:2) in 500ml of distilled water, heat and stir in a water bath at 80°C, and at the same time slowly add diluted Keep the ratio of fluoride ion to metal ion (the sum of barium ion and lanthanum ion) of hydrofluoric acid solution at 22.5, stir vigorously while adding it, and filter it when the hydrofluoric acid solution is added dropwise and there is no more colored precipitation After washing twice with water, it was transferred to a 100°C blast drying oven to dry for 12 hours. After the residual liquid was completely removed, it was placed in a muffle furnace, and the temperature was raised to 800°C at a heating rate of 2°C / min and kept for 2 hours, and then The composite barium lanthanum fluoride catalyst can be obtained by lowering the temperature. Finally, it is pressed into a tablet at 20 MPa ...

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Abstract

The invention discloses a method for preparing vinylidene fluoride by a reaction of trifluoromethane and methane under the action of a composite catalyst, wherein the composite catalyst comprises a component 1 and a component 2, the component 1 comprises a lanthanum-based metal, and the component 2 comprises an IIA group metal. The method provided by the invention has the characteristics of high vinylidene fluoride selectivity, high methane conversion rate, low reaction temperature and the like.

Description

technical field [0001] The invention relates to a method for resource conversion of trifluoromethane, in particular to a method for resource conversion of trifluoromethane to prepare vinylidene fluoride. Background technique [0002] Trifluoromethane, because its greenhouse effect potential (GWP) is 14,800 times that of carbon dioxide, is a super greenhouse gas and has been banned as a refrigerant. Trifluoromethane is also a by-product of industrial production of chlorodifluoromethane (HCFC-22, R22), which cannot be directly discharged into the atmosphere due to its high greenhouse effect potential, but needs to be treated. [0003] In general industry, trifluoromethane is treated by incineration, and it is completely decomposed into hydrogen fluoride, carbon dioxide and other substances by calcining. However, incineration treatment needs to be equipped with special incineration equipment, which requires a large investment, and the decomposition product hydrogen fluoride is...

Claims

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Application Information

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IPC IPC(8): C07C17/26C07C21/18B01J27/138
CPCC07C17/26B01J27/138C07C21/18
Inventor 韩文锋王金超王术成刘武灿张建君
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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