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A kind of preparation method of hfc-365mfc and hfc-245fa

A technology of hfc-245fa, cf3ch2-ccl2-ch3, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, preparation of halogen substitution, etc., can solve problems such as unpublished methods

Active Publication Date: 2022-08-02
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

[0015] At present, the method for preparing HFC-365mfc or HFC-245fa from trifluoromethane has not been disclosed in the prior art

Method used

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  • A kind of preparation method of hfc-365mfc and hfc-245fa

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0063] Preparation of catalyst used in step (2) of the present invention.

[0064] The Ni (NO 3 ) 2 ·6H 2 O, Rh (NO 3 ) 3 ·2H 2 O and Mn (NO 3 ) 2 ·6H 2 O, dissolved in 500ml of water, add 25% aqueous ammonia solution dropwise to the above solution, control the pH value to 9, and turn on magnetic stirring at the same time, centrifuge dry, remove the lower layer of precipitate, dry at 120 °C and bake at 450 °C for 6h in nitrogen atmosphere A nickel-rhodium-manganese composite catalyst is obtained, wherein the molar ratio of nickel, rhodium and manganese is 1:0.5:0.15.

preparation example 2

[0066] The catalyst used in step (2) was prepared according to the method of Preparation Example 1, except that Zn(NO 3 ) 2 ·6H 2 O replaces Mn (NO 3 ) 2 ·6H 2 O, prepare a nickel-rhodium-zinc composite catalyst, wherein the molar ratio of nickel, rhodium and zinc is 1:0.5:0.15.

preparation example 3

[0068] The catalyst used in step (2) was prepared according to the method of Preparation Example 1, except that the molar ratio of the prepared nickel, rhodium and manganese was 1:1:0.8.

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Abstract

The invention provides a preparation method of HFC-365mfc and HFC-245fa, which adopts CF obtained by reacting trifluoromethane and chlorine gas 3 Preparation of CF by Cl and 2-chloropropene under the action of catalyst 3 CH 2 ‑CCl 2 ‑CH 3 , CF 3 CH 2 ‑CCl 2 ‑CH 3 Obtain HFC-365mfc through fluorination reaction again; CF 3 Cl reacts with vinyl chloride or vinyl fluoride to produce CF 3 CH 2 CHCl 2 or CF 3 CH 2 CHFCl, and then through fluorination reaction to obtain HFC-245fa. The catalyst of the invention has high activity, long service life, high conversion rate of raw materials, high product selectivity of HFC-365mfc and HFC-245fa, and at the same time, the raw material trifluoromethane is a by-product in the industrial production of R22, and the trifluoromethane is well realized. Resource utilization of methane.

Description

technical field [0001] The invention belongs to the field of fluorine chemical industry, and relates to a preparation method of hydrofluorocarbon, in particular to a preparation method of HFC-365mfc and HFC-245fa. Background technique [0002] HFC-23 (CHF3, trifluoromethane, R23), is HCFC-22 (CHClF 2 , difluoromonochloromethane, R22) is an inevitable by-product in the industrial production process, with a strong greenhouse effect, its GWP value is as high as 14800, the emission has been controlled internationally, and it is used as a carbon trading object. Generally, incineration is used in industry to treat trifluoromethane, and it is completely decomposed into hydrogen fluoride, carbon dioxide and other substances. However, incineration treatment needs to be equipped with special incineration equipment, the investment is large, and the decomposition product hydrogen fluoride is easy to corrode the equipment. If the trifluoromethane can be used as a resource to convert it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/08C07C17/20B01J23/89B01J23/656B01J23/60B01J23/889B01J27/13
CPCC07C17/206C07C17/278C07C17/10B01J23/8986B01J23/8953B01J23/6562B01J23/60B01J23/8892B01J23/002B01J27/13B01J2523/00C07C2523/89C07C2523/656C07C2523/60C07C2523/889C07C2527/13C07C19/08C07C19/10B01J2523/72B01J2523/822B01J2523/847B01J2523/27B01J2523/824
Inventor 周飞翔王术成刘武灿张建君韩文锋
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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