Catalyst for preparing tetrafluoroethylene and hexafluoropropylene through catalytic cracking of trifluoromethane and preparation method thereof

A trifluoromethane, catalytic cracking technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low catalyst conversion rate, easy coking and loss of catalyst It can improve the conversion rate and target product selectivity, improve the low temperature reaction activity, and improve the anti-carbon deposition ability.

Active Publication Date: 2019-01-25
SHANDONG DONGYUE CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The process of preparing tetrafluoroethylene / hexafluoropropylene by pyrolysis of trifluoromethane is simple in process, high in added value of the product, and has great industrialization prospects. However, in the case of no catalyst, the cracking of empty tubes alone, the reaction temperature is 1000°C, and the conversion rate is 10%- About 20%; the conversion rate is low, and there are many by-products, and the separation is difficult
The catalyst of this invention can effectively reduce the reaction temperature of trifluoromethane catalytic cracking reaction, but the catalyst used is prone to coking and deactivation, the service life of the catalyst is short, the conversion rate of the catalyst is not high under low temperature conditions, and the low temperature reaction effect is not good

Method used

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  • Catalyst for preparing tetrafluoroethylene and hexafluoropropylene through catalytic cracking of trifluoromethane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A preparation method for a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:

[0033] Take Al 2 o 3 Carrier 100g, put into drying box, dry at 100°C for 3h; put 13.5g La(NO 3 ) 3 Dissolve in 100ml of pure water to make an impregnation solution; put the dried carrier into the impregnation solution, take it out after immersion 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 at a flow rate of 6L / min, and fluorinate at 350°C for 60h to finally ...

Embodiment 2

[0035] A preparation method for a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:

[0036] Take AlF 3 Carrier 100g, put into drying box, dry at 100°C for 3h; put 13.5g La(NO 3 ) 3 Dissolve in 100ml of pure water to make an impregnation solution; put the dried carrier into the impregnation solution, take it out after immersion 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 at a flow rate of 6L / min, and fluorinate at 350°C for 60h to finally ob...

Embodiment 3

[0038] A preparation method for a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane, comprising the steps of:

[0039] Take Al 2 o 3 Carrier 100g, placed in a drying oven, dried at 100°C for 3 hours; 13.5g of CsNO 3 Dissolve in 100ml of pure water to make an impregnation solution; put the dried carrier into the impregnation solution, take it out after immersion 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 at a flow rate of 6L / min, and fluorinate at 350°C for 60h to fi...

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Abstract

The invention provides a catalyst for preparing tetrafluoroethylene and hexafluoropropylene through catalytic cracking of trifluoromethane and a preparation method thereof. The catalyst is prepared through the steps of preparing a precursor from a carrier and an active component through an impregnation method and then carrying out roasting and trifluoromethane fluorination; the carrier is Al2O3 orAlF3; the active component is one or a combination of two of nitride and nitrate of Cs, La, Sm, Pd, Pt, K or Na. The preparation method provided by the invention is simple, is capable of catalytically cracking the trifluoromethane under lower temperature and mild conditions, and is low in equipment requirements, low in energy consumption and low in cost; the prepared catalyst is capable of effectively reducing the reaction temperature of the catalytic cracking of the trifluoromethane, the conversion rate of raw materials and selective increment of a target product can be realized under milderconditions, the problem of coking of the catalyst can be effectively solved, and the service life of the catalyst can be prolonged.

Description

technical field [0001] The invention relates to a catalyst for preparing tetrafluoroethylene and hexafluoropropylene by catalytic cracking of trifluoromethane and a preparation method thereof, belonging to the field of fluorine chemical catalyst preparation. Background technique [0002] Trifluoromethane (CHF 3 , HFC-23) is a by-product produced during the catalytic reaction of chloroform and HF to prepare difluorochloromethane (HCFC-22), and its generation amount is about 1.5-3.5wt% of the content of HCFC-22; but due to HCFC -22 itself is used as the main raw material for the manufacture of perfluoroolefins such as tetrafluoroethylene (TFE), so difluorochloromethane is excluded from the emission reduction items stipulated in the "Kyoto Protocol"; therefore trifluoromethane (CHF 3 ) emissions will continue for a long time, and the annual CHF 3 As many as tens of thousands of tons. Trifluoromethane is a greenhouse gas (GWP value is about 14800, equivalent to CO 2 14800 ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/04B01J23/10B01J23/42B01J23/44B01J27/12C07C17/269C07C21/185C07C21/18
CPCC07C17/269B01J23/002B01J23/04B01J23/10B01J23/42B01J23/44B01J27/12C07C21/185C07C21/18Y02P20/584
Inventor 丁晨王鑫都荣礼王伟徐强
Owner SHANDONG DONGYUE CHEM
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