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A catalyst for the gas phase removal of HF from 1,1-difluoroethane to prepare vinyl fluoride, its preparation method and application

A technology of difluoroethane and catalyst, which is applied in the field of preparation of organic fluorine compounds, can solve the problems of catalytic selectivity to be improved, catalyst anti-carbon deposition ability, and service life without record, so as to improve anti-carbon deposition ability and application effect, Improved service life and application performance, easy to control effects

Active Publication Date: 2022-03-29
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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  • A catalyst for the gas phase removal of HF from 1,1-difluoroethane to prepare vinyl fluoride, its preparation method and application
  • A catalyst for the gas phase removal of HF from 1,1-difluoroethane to prepare vinyl fluoride, its preparation method and application
  • A catalyst for the gas phase removal of HF from 1,1-difluoroethane to prepare vinyl fluoride, its preparation method and application

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Embodiment 1

[0037] A preparation method of 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 box, 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 prepare an impregnation solution; put the dried activated carbon into the impregnation solution, soak it for 20 minutes, take it out, put it in a drying box and dry it at 100 ℃ for 3 hours to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass 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 6 L / min, and turn off nitrogen after 2 h; pass trifluoromethane alone...

Embodiment 2

[0045] A preparation method of 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 box, 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 and configure it into an impregnation solution; put the dried activated carbon into the impregnation solution, after dipping for 20min, put it in a drying box and dry it at 100℃ for 3h to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then, trifluoromethane gas was introduced for fluorination at 300°C at a flow rate of 6L / min. After 2 hours, nitrogen was turned off, and trifluorometha...

Embodiment 3

[0053] A preparation method of 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 box, 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, configure it into an impregnation solution, put the dried activated carbon into the impregnation solution, after dipping for 20 minutes, put it in a drying box and dry it at 100 ° C for 3 hours to obtain the precursor; take it out, put it in a roasting furnace, It was calcined at 400 °C for 6 h in a nitrogen atmosphere. Take out the calcined precursor and put it in In the reaction tube, pass N 2 , N 2 The flow rate is 300ml / min, and it is dried at a temperature of 300°C for 24h. Then, trifluoromethane gas was introduced for fluorination at 300°C at a flow rate of 6L / min. After 2 hours, nitrogen was turned off, and tri...

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Abstract

The invention provides a catalyst for preparing vinyl fluoride by removing HF from 1,1-difluoroethane in gas phase, and a preparation method and application thereof. The catalyst is prepared from a carrier and an active component through an impregnation method to prepare a precursor, followed by calcination and fluorination of trifluoromethane; the carrier is activated carbon; the active component is metal chloride or metal nitrate. The catalyst prepared by the invention is applied to 1,1-difluoroethane to prepare vinyl fluoride, which significantly increases the carbon deposition resistance of the catalyst and prolongs the service life. The selectivity and the conversion of 1,1-difluoroethane (R152a) are high.

Description

technical field [0001] The invention relates to a catalyst for preparing vinyl fluoride by removing HF from 1,1-difluoroethane in a gas phase, a preparation method and application thereof, and belongs to the technical field of organic fluorine compound preparation. Background technique [0002] Hydrofluoroalkanes (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 their 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 certain bottlenecks. Therefore, it is of great significance for the development of fluorine chemical industry to seek suitable downstream products of fluorine-containing alkanes. The HFO is an intermediate of great economi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/10B01J27/25C07C17/25C07C21/18
CPCC07C17/25B01J27/10B01J27/25C07C21/18
Inventor 丁晨王鑫都荣礼王伟徐强
Owner SHANDONG DONGYUE CHEM
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