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

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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

Method used

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  • Method for preparing vinylidene fluoride by resource conversion of trifluoromethane

Examples

Experimental program
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Example Embodiment

[0035] Example 1: Catalyst preparation

[0036] First take 58.8g of barium nitrate and 10.8g of lanthanum nitrate (the molar ratio of barium to lanthanum is Ba:La=9:1), dissolve them in 500ml of distilled water, heat and stir in a water bath at 80℃, and slowly add the diluted Hydrofluoric acid solution, keep the ratio of fluoride ion to metal ion (the sum of barium ion and lanthanum ion) at 22.5, and stir vigorously while adding the hydrofluoric acid solution. When the hydrofluoric acid solution is added dropwise, no white precipitate appears After filtering and washing twice with water, a white precipitate was obtained. The white precipitate obtained was transferred to a 100°C blast drying oven for drying for 12 hours. After the remaining liquid was completely removed, it was placed in a muffle furnace. The temperature was raised to 800°C at a heating rate of 2°C / min and kept for 2 hours, then The composite barium lanthanum fluoride catalyst is obtained after self-cooling.

Example Embodiment

[0037] Example 2: Catalyst preparation

[0038] First take 51g of barium nitrate and 21.5g of lanthanum nitrate (the molar ratio of barium to lanthanum is Ba:La=4:1) and dissolve them in 500ml of distilled water, heat and stir in a water bath at 80℃, while slowly adding diluted hydrogen to the barium and lanthanum mixture The hydrofluoric acid solution maintains the ratio of fluoride ion to metal ion (the sum of barium ion and lanthanum ion) at 22.5. While adding the hydrofluoric acid solution, stir vigorously. When the hydrofluoric acid solution is dripped and no white precipitate appears, After it was filtered and washed twice with water, a white precipitate was obtained. The white precipitate obtained was transferred to a 100°C blast drying oven for drying for 12 hours. After the remaining liquid was completely removed, it was placed in a muffle furnace. The temperature was raised to 800°C at a heating rate of 2°C / min and kept for 2 hours, then The composite barium lanthanum ...

Example Embodiment

[0039] Example 3: Catalyst preparation

[0040] First take 39g of barium nitrate and 43.3g of lanthanum nitrate (the molar ratio of barium to lanthanum is Ba:La=3:2) and dissolve them in 500ml of distilled water. Heat and stir in a water bath at 80°C. At the same time, slowly add the diluted solution 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. Stir vigorously while adding it. When the hydrofluoric acid solution is added dropwise and no more colored precipitate appears, filter it After washing twice with water, transfer it to a 100℃ blast drying oven for 12h. After the remaining liquid is completely removed, place it in a muffle furnace, heat it up to 800℃ at a heating rate of 2℃ / min and keep it for 2h, and then self The composite barium lanthanum fluoride catalyst can be obtained by cooling, and finally it is pressed into a 20MPa tablet and then crushed to 10-20...

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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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