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Catalyst for synthesizing 2,3,3,3-tetrafluoropropene and preparation method and application thereof

A technology of tetrafluoropropene and catalyst, which is applied in the direction of dehydrohalogenation preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of less publicity, and achieve the goals of improving stability, delaying carbonization speed, and prolonging life Effect

Active Publication Date: 2015-06-24
ZHEJIANG QUHUA FLUOR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing technologies focus on using 1,1,1,2,3-pentafluoropropane (CF 3 CHFCH 2 F, CFC-245eb) as raw material for the preparation of HFO-1234yf technology, with 1,1,1,2,2-pentafluoropropane (CF 3 CHF 2 CH 3 , HFC-245cb) as a raw material for the preparation of HFO-1234yf technical disclosure less

Method used

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  • Catalyst for synthesizing 2,3,3,3-tetrafluoropropene and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh CrCl 3 ·6H 2 0200g, Zn(NO 3 ) 2 ·6H 2 O 4.5 grams, be dissolved in 1500 milliliters of pure waters, mix homogeneously, add the ammoniacal liquor that mass percent concentration is 20% to carry out precipitation reaction in this solution, the pH value of adjusting solution is 7, then filter, wash, filter cake Crushed and dissolved in water to form a slurry, continue to add ammonia water with a mass percentage concentration of 20% to the slurry to react, adjust the pH value of the slurry to 9, filter, wash, granulate into 15-20 mesh particles, and dry at 120°C ; Then in the nitrogen and air atmosphere with a molar ratio of 10:1, after calcining at 350° C. for 4 hours, add glass water, and press tablet molding to obtain a cylindrical catalyst precursor of φ 3 × 3 mm, wherein the molar ratio of Cr and Zn is 1:0.02.

[0023] The catalyst precursor prepared above was loaded into an Inconel 600 reactor, and activated with anhydrous hydrogen fluoride, the activation ...

Embodiment 2

[0025] Weigh CrCl 3 ·6H 2 0200g, Zn(NO 3 ) 2 ·6H 2 O 17.8 grams, the preparation process of catalyst, activation and reaction conditions are the same as embodiment 1, and difference is: the mol ratio of Cr and Zn is 1:0.08 in the catalyst precursor that makes; The conversion of -245cb was 38%, and the selectivity of HFO-1234yf was 99.3%.

Embodiment 3

[0027] Weigh CrCl 3 ·6H 2 0200g, Zn(NO 3 ) 2 ·6H 2 O 22.2 grams, the preparation process of catalyst, activation and reaction conditions are the same as embodiment 1, and difference is: the mol ratio of Cr and Zn is 1:0.1 in the catalyst precursor that makes; The conversion of -245cb was 45.2%, and the selectivity of HFO-1234yf was 99.6%.

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Abstract

The invention discloses a catalyst for synthesizing 2,3,3,3-tetrafluoropropene by using 1,1,1,2,2-perfluoropropane and a preparation method and application thereof. The catalyst takes chromium as a main component and takes one selected from cobalt, magnesium, nickel, zinc and aluminum as an auxiliary component, wherein the molar ratio of chromium to the auxiliary component is 1:(0.02-0.3). When being used for synthesizing the 2,3,3,3-tetrafluoropropene in a 1,1,1,2,2-perfluoropropane gas phase, the catalyst has the advantages of simplicity in operation, less reaction by-products, high catalyst activity and the like.

Description

technical field [0001] The invention relates to the field of HFO-1234yf preparation, in particular to a method for preparing a catalyst for gas phase synthesis of 2,3,3,3-tetrafluoropropene from 1,1,1,2,2-pentafluoropropane. Background technique [0002] As a global hot topic, the replacement of fluorinated refrigerants requires its ozone depletion potential (ODP) to be zero, its greenhouse effect potential (GWP) to be low, and its atmospheric life to be as short as possible. The first generation of refrigerants, HCFCs, dichlorodifluoromethane (CCl 2 f 2 , CFC-12), etc. have been eliminated due to ODP around 1. As a first-generation and second-generation transitional refrigerant substitute hydrochlorofluorocarbon monochlorodifluoromethane (CHClF 2 , HCFC-22), etc., are gradually being phased out due to their ODP>0. The second generation refrigerant hydrofluorocarbon 1,1,1,2-tetrafluoroethane (CF 3 CH 2 F, HFC-134a), is widely used in automotive air conditioners, hom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J23/86C07C21/18C07C17/25
Inventor 张彦雷俊谭显文龚海涛周华东吴天勇
Owner ZHEJIANG QUHUA FLUOR CHEM