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Catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as preparation method and application of catalyst

The technology of difluoroethane and catalyst is applied in the field of preparation of organic fluorine compounds, which can solve the problems that the catalyst selectivity needs to be improved, the carbon deposition resistance of the catalyst and the unrecorded service life, etc., so as to improve the carbon deposition resistance and application effect, Improve service life and application performance, easy to control effect

Active Publication Date: 2019-01-11
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this invention has low requirements on the purity of raw materials, but it does not involve the impact of different particle diameter carriers and subsequent fluorination on the performance of the catalyst. The catalytic selectivity needs to be improved, and there is no record in the anti-carbon deposition ability and service life of the catalyst.

Method used

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  • Catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as preparation method and application of catalyst
  • Catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as preparation method and application of catalyst
  • Catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as preparation method and application of catalyst

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Effect test

Embodiment 1

[0037] A method for preparing a catalyst for 1,1-difluoroethane gas phase removal of HF to prepare vinyl fluoride, comprising the steps of:

[0038] Take 100 g of activated carbon with a particle diameter of 0.5 mm, put it in a drying oven, and dry it at 100° C. for 3 hours to obtain dried activated carbon. 13.35g Mg(NO 3 ) 2Dissolve in 100ml of pure water to make an impregnation solution; put the dried activated carbon into the impregnation solution, take it out after impregnation for 20 minutes, put it in a drying oven and dry it at 100°C for 3 hours to obtain a precursor; take it out, put it in a roasting furnace, Calcined at 400°C for 6h in a nitrogen atmosphere. Take out the roasted precursor and put it into In the reaction tube, N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas at 300°C for fluorination at a flow rate of 6L / min, and turn off the nitrogen gas after 2h; pass trifluoromethane alone...

Embodiment 2

[0045] A method for preparing a catalyst for 1,1-difluoroethane gas phase removal of HF to prepare vinyl fluoride, comprising the steps of:

[0046] Take 100 g of activated carbon with a particle diameter of 1 mm, put it in a drying oven, and dry it at 100° C. for 3 hours to obtain dried activated carbon. 13.35g Mg(NO 3 ) 3 Dissolve in 100ml of pure water to make an impregnation solution; put the dried activated carbon into the impregnation solution, impregnate for 20 minutes, put it in a drying oven and dry it for 3 hours at 100°C to obtain a precursor; take it out, put it in a roasting furnace, and Calcined at 400°C for 6h in a nitrogen atmosphere. Take out the roasted precursor and put it into In the reaction tube, N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas for fluorination at 300°C at a flow rate of 6L / min, turn off the nitrogen gas after 2h, pass trifluoromethane alone at a flow rate of 6L...

Embodiment 3

[0053] A method for preparing a catalyst for 1,1-difluoroethane gas phase removal of HF to prepare vinyl fluoride, comprising the steps of:

[0054] Take 100 g of activated carbon with a particle diameter of 1 mm, put it in a drying oven, and dry it at 100° C. for 3 hours to obtain dried activated carbon. 13.35g La(NO 3 ) 3 Dissolve in 100ml of pure water to prepare an impregnating solution. Put the dried activated carbon into the impregnating solution. After impregnating for 20 minutes, put it in a drying oven and dry it at 100°C for 3 hours to obtain a precursor; take it out, put it in a roasting furnace, and Calcined at 400°C for 6h in a nitrogen atmosphere. Take out the roasted precursor and put it into In the reaction tube, N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then pass trifluoromethane gas for fluorination at 300°C at a flow rate of 6L / min, turn off the nitrogen gas after 2h, pass trifluoromethane alone at a flow...

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Abstract

The invention provides a catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as a preparation method and application of the catalyst. The catalyst is prepared by the steps of preparing a precursor from a carrier and an active component, and carrying out roasting and trifluoromethane fluorination, wherein the carrier is activated carbon, andthe active component is metal chloride or metal nitrate. The prepared catalyst is applied to the preparation of vinyl fluoride by virtue of 1,1-difluoroethane, the anti-carbon performance of the catalyst is remarkably improved, and the service life of the catalyst is prolonged; and meanwhile, the selectivity of reaction for preparing vinyl fluoride from 1,1-difluoroethane at low temperature and the conversion rate of 1,1-difluoroethane(R152a) are relatively high.

Description

technical field [0001] The invention relates to a catalyst for preparing vinyl fluoride by gas-phase removal of HF from 1,1-difluoroethane, a preparation method and application thereof, and belongs to the technical field of organic fluorine compound preparation. Background technique [0002] Hydrofluorocarbons (HFCs) have excellent performance and zero ODP, and are widely used in refrigerants, cleaning agents and other industries. However, some HFCs have high greenhouse effect potential (GWP), and large-scale use will cause global warming. Therefore, some HFCs have also entered the restricted range in recent years in order to slow down the environmental damage caused by greenhouse gases, and the development of fluorinated alkanes has encountered a certain bottleneck. Therefore, seeking suitable downstream products of fluorine-containing alkanes is of great significance to the development of fluorine chemical industry. Hydrofluoroolefins are intermediates of great economic v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10B01J27/25C07C17/25C07C21/18
CPCB01J27/10B01J27/25C07C17/25C07C21/18
Inventor 丁晨王鑫都荣礼王伟徐强
Owner SHANDONG DONGYUE CHEM
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