Regeneration method of fluorination catalyst

Abstract

The invention relates to a fluorination catalyst regeneration method which comprises a high-temperature purging process, a high-temperature regenerating process, a ratio of transformation generating process and a high-pressure generating process, wherein the high-temperature purging process is that a high-temperature catalyst is purged through high-temperature nitrogen; the high-temperature regenerating process is that the catalyst is regenerated through a mixed gas containing less gas capable of reacting with carbon; the ratio of transformation generating process is that the content of reaction gas in the mixed gas is constantly increased to regenerate the catalyst; the high-pressure generating process is that the mixed gas regenerates the catalyst under the condition that the environment stress of a regeneration system is constantly increased. The method can enable the activity of the catalyst to recover to initial activity.

Description

technical field [0001] The invention relates to a regeneration method of a fluorination catalyst used in the preparation process of fluoroalkane. Background technique [0002] 1,1,1,2-tetrafluoroethane (HFC-134a) and pentafluoroethane (HFC-125) are ODS (ozone-depleting substances) substitutes and are new green refrigerants. 1,1,1,2-Tetrafluoroethane (HFC-134a) and pentafluoroethane (HFC-125) can be catalyzed by HF and halogenated olefins under the catalysis of a solid catalyst at a certain temperature, pressure and contact time prepared by reacting under conditions. Chinese invention patent ZL01141970.9 discloses a fluorination catalyst that can be used for the preparation of 1,1,1,2-tetrafluoroethane. The structure formula of the fluorination catalyst is CrX 0.005-0.5 Y 0.005-0.3 o 0.1-1.0 f 1.0-3.0 , where X is Mn, Co or Zn, and Y is Mg or Ni. The catalyst has the advantages of high activity, good stability and long service life. However, due to high-temperature car...

AI Technical Summary

Problems solved by technology

This regeneration method has a better regeneration effect for most metal catalysts, but for the fluorination catalyst with the above structure, the regeneration effect is not ideal, and the activity of the regenerated catalyst can only reach 50% to 60% of the fresh catalyst

In addition, there are also problems such as the low specific surface area of ​​the fluorination catalyst, which leads to rapid decay of the catalytic activity of the catalyst and low selectivity of the target product.

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