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A kind of preparation method of gas phase fluorination catalyst

A fluorination catalyst and gas-phase fluorination technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low activity of fluorination catalysts, reduced specific surface area, frequent regeneration and activation, etc.

Active Publication Date: 2020-07-07
RUYUAN DONGYANG LIGHT FLUORIDE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that the specific surface area of ​​the gas-phase fluorination catalyst precursor undergoes fluorination and activation treatment is greatly reduced, resulting in low activity, poor stability, frequent regeneration and activation of the fluorination catalyst, etc., the present invention provides A new preparation method of gas-phase fluorination catalyst, the obtained gas-phase fluorination catalyst still has a high specific surface area after fluorination, exhibits high activity and high stability, and is especially suitable for the preparation of R134a products

Method used

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  • A kind of preparation method of gas phase fluorination catalyst
  • A kind of preparation method of gas phase fluorination catalyst

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Effect test

Embodiment 1-1

[0071] The preparation of embodiment 1-1 nanocrystalline γ-alumina powder

[0072] 25.03g Al(NO 3 ) 3 9H 2 O, 1.35g MgCl 2 , 0.21gLaCl 3 1. 1g of organic matter I (0.26g of isopropanol + 0.56g of tartaric acid + 0.18g of glucose) was dissolved in 500mL of ethanol solvent, refluxed at 80°C for 2h, then added dropwise with ammonium carbonate aqueous solution for 10min, and then maintained the reaction Crystallize at high temperature for 12 hours to obtain a liquid sol, then vacuum dry the liquid sol at 110°C for 12 hours to obtain a solid gel, and finally roast at 550°C for 3 hours to obtain nanocrystalline γ-alumina powder, which is used as a carrier for future use.

Embodiment 1-2

[0073] The preparation of embodiment 1-2 nanocrystalline gamma-alumina powder

[0074] 25.03g Al(NO 3 ) 3 9H 2 O was dissolved in 500mL ethanol solvent, refluxed at 80°C for 2h, then ammonium carbonate aqueous solution was added dropwise for 10min, and then crystallized at the reaction temperature for 12h to obtain a liquid sol, and then the liquid sol was vacuum-dried at 110°C After 12 hours, a solid gel was obtained, and finally the nanocrystalline γ-alumina powder was obtained by roasting at 550°C for 3 hours.

Embodiment 2

[0075] The preparation of embodiment 2 amorphous chromium oxide powder

[0076] Weigh 50.02g CrCl 3 ·6H 2 O, 1.85gMgCl 2 , 2.81g AlCl 3 , 1.53gZnCl 3 , 0.21g LaCl 3 , 2.49g organic matter I (0.68g ethanol+1.42g citric acid+0.39g sucrose) was dissolved in 900mL deionized water to obtain a mixed salt solution, the mixed salt solution was mixed with ammonia water until the solution pH=10, filtered and washed with water to obtain a sample, The sample was dried in an oven at 110°C for 6 hours, and then transferred to a roasting furnace. 2 Roast at a high temperature of 350°C for 3 hours in the atmosphere, crush and sieve the calcined sample to obtain amorphous chromium oxide powder for future use.

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Abstract

The invention relates to a method for preparing a gas-phase fluorination catalyst, which includes: uniformly mixing nanocrystalline γ-alumina powder, amorphous chromium oxide powder, organic matter II and graphite, and pressing into tablets to obtain a gas-phase fluorination catalyst precursor; The gas phase fluorination catalyst precursor is fluorinated to obtain the gas phase fluorination catalyst. Among them, nanocrystalline γ-alumina powder is prepared by a hydrogel-sol method, and organic matter I is added. The organic matter I and organic matter II can be thermally decomposed and volatilized to form pores, so that the resulting gas-phase fluorination catalyst still has a high specific surface area after fluorination, exhibits high activity and high stability, and is particularly suitable for R134a products. preparation.

Description

technical field [0001] The invention relates to a preparation method of a fluorination catalyst, in particular to a preparation method of a catalyst used for the gas-phase fluorination reaction of halogenated hydrocarbons and hydrogen fluoride, especially a preparation method of a gas-phase fluorination catalyst used to catalyze the preparation of R134a. Background technique [0002] In recent years, studies have found that hydrofluorocarbons ((HFCs) have an ozone depletion potential (ODP) of 0 and a low global warming potential (GWP), and are widely used in large commercial refrigerants, blowing agents, fire extinguishing agents, etc. At present, the key production process of mainstream environmentally friendly refrigerants (R125, R134a, R1234yf) products in the market is the gas-phase fluorination catalytic reaction process. The fluorination catalyst mainly adopts chromium-based solid catalyst or aluminum-based solid catalyst; a large number of studies have found that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J35/10B01J37/00B01J37/03B01J37/26C07C17/20C07C19/08
CPCC07C17/206B01J23/26B01J37/0018B01J37/038B01J37/26B01J35/60B01J35/615C07C19/08
Inventor 李义涛黄永锋胡聿明余航梁任龙
Owner RUYUAN DONGYANG LIGHT FLUORIDE CO LTD
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