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Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method

A fluorination catalyst and gas phase fluorination technology, applied in the direction of halogen substitution preparation, etc., can solve the problems of crystal shape transformation, catalyst deactivation, catalyst service life limitation, etc., and achieve the effects of fast price, high activity, and simple operation method.

Active Publication Date: 2010-05-26
ZHEJIANG NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of catalyst has the following disadvantages in production and use: this type of catalyst is prone to produce unwanted by-products that are difficult to separate in production, and at a certain temperature Al 2 o 3 or AlF 3 Unavoidable crystal transformation will occur, leading to deactivation of the catalyst and limiting the service life of the catalyst

Method used

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  • Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method
  • Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method
  • Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method

Examples

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Effect test

Embodiment 1

[0019] First, weigh CrCl according to the loading amount of Cr as 30wt%. 3 ·6H 2 O and Y (NO 3 ) 3 ·6H 2 O, dissolve with an appropriate amount of water, mix evenly, add a certain amount of ammonia water, adjust the pH value of the solution to 8, make the two precipitate completely, then centrifuge, wash until the filtrate is neutral, and then dry at 120°C overnight. After that, it is pressed into a tablet and then calcined at 400° C. for 4 hours to obtain a fluorination catalyst precursor. The fluorination catalyst precursor was dried with nitrogen gas at 300° C. for 10 h under normal pressure, and then treated with anhydrous HF at 400° C. for 10 h to obtain a fluorination catalyst. Its reactivity and selectivity are listed in Table 1.

Embodiment 2

[0021] First, weigh Cr(NO 3 ) 3 9H 2 O and YCl 3 ·7H 2 O, dissolve with an appropriate amount of water, mix evenly, add a certain amount of ammonia water, adjust the pH value of the solution to 8, make the two precipitate completely, then centrifuge, wash until the filtrate is neutral, and then dry at 120°C overnight. After that, it is pressed into a tablet and then calcined at 400° C. for 4 hours to obtain a fluorination catalyst precursor. The fluorination catalyst precursor was dried with nitrogen gas at 300° C. for 10 h under normal pressure, and then treated with anhydrous HF at 400° C. for 10 h to obtain a fluorination catalyst. Its reactivity and selectivity are listed in Table 1.

Embodiment 3

[0023] First, weigh Cr(NO 3 ) 3 9H 2 O and Y (NO 3 ) 3 ·6H 2 O, dissolve with an appropriate amount of water, mix evenly, add a certain amount of ammonia water, adjust the pH value of the solution to 8, make the two precipitate completely, then centrifuge, wash until the filtrate is neutral, and then dry at 120°C overnight Press into a tablet, and then calcined at 400° C. for 4 hours to obtain a fluorination catalyst precursor. The fluorination catalyst precursor was dried with nitrogen gas at 300° C. for 10 h under normal pressure, and then treated with anhydrous HF at 400° C. for 10 h to obtain a fluorination catalyst. Its reactivity and selectivity are listed in Table 1.

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Abstract

The invention relates to a catalyst for fluorination, especially a catalyst for producing HFC-134a in gas phase fluorination and the manufacturing method. Aiming at the lack of prior technology, the invention provides a catalyst for producing HFC-134a in gas phase fluorination with high activity and high stability and the manufacturing method. The catalyst comprises carrier and active component. The carrier adopts Y compound and the active component adopts Cr compound. The preparing process for the catalyst for producing HFC-134a in gas phase fluorination is that soluble Cr and Y salts are taken to be dissolved by water according to the proportion; it is mixed in uniformity; precipitant is added to make them precipitate; then the filter solution is neural after centrifugal separation and washing; it is dried; the dried precipitate is formed by tablet mould; the precursor of fluorination catalyst is obtained by baking; after it is treated dry by nitrogen, it is treated by HF without water; finally the catalyst is obtained.

Description

technical field [0001] The invention relates to a catalyst for fluorination reaction, in particular to a catalyst suitable for producing 1,1,1,2-tetrafluoroethane (HFC-134a) by a gas-phase fluorination method and a preparation method thereof. Background technique [0002] At present, the catalyst used for the reaction of 1,1,1-trifluoro-2-chloroethane (HCFC-133a) and anhydrous HF to produce 1,1,1,2-tetrafluoroethane (HFC-134a) is Cr catalyst , the existing fluorination catalysts are basically based on Al 2 o 3 or AlF 3 or MgF 2 Catalysts such as Al source and Mg source as the carrier, loaded with active components such as Cr. At 320°C, the conversion rate of this type of catalyst to HCFC-133a and the selectivity to HFC-134a are about 20% and 95% respectively. At present, there are a large number of fluorination catalysts disclosed by Chinese patent documents, such as: [0003] CN 1145275A discloses a catalyst for synthesizing HFC-134a by reacting trichlorethylene and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J23/10C07C19/08C07C17/20
Inventor 罗孟飞黄华章钟依均许生来何军谢冠群谢云龙张彦钱林
Owner ZHEJIANG NORMAL UNIVERSITY
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