Method for regenerating fluorination catalyst

Abstract

The invention relates to a method for regenerating a fluorination catalyst. The method comprises the following steps: pickling an inactivated fluorination catalyst in an acid solution; calcining the pickled inactivated fluorination catalyst in an oxidizing gas; impregnating the calcined inactivated fluorination catalyst in an active supplementing solution; and regenerating the impregnated fluorination catalyst in a hydrogen fluoride-containing atmosphere, or regenerating the impregnated fluorination catalyst in a hydrogen-containing atmosphere and regenerating the impregnated fluorination catalyst in the hydrogen fluoride-containing atmosphere. The regeneration method has the following advantages: pickling can effectively remove metal impurities on the surface of the fluorination catalystand easily removes carbon deposited on the surface of the fluorination catalyst, so the fluorination catalyst is fully activated; and the calcined fluorination catalyst is impregnated in the active supplementing solution to make the fluorination catalyst fully obtain full new active sites in the regeneration process, so the catalytic activity of the regenerated fluorination catalyst is greatly improved. The regenerated fluorination catalyst has a good control effect on a byproduct R115 when applied to catalytic preparation of R125.

Description

technical field [0001] The invention relates to a regeneration treatment method of a catalyst, in particular to a regeneration method of a fluorination catalyst used in the gas-phase fluorination reaction of halogenated hydrocarbons and hydrogen fluoride. Background technique [0002] Hydrofluorocarbons are considered to be the best compounds to replace chlorofluorocarbons (freons). The main method of synthesizing fluorocarbons is gas-phase fluorination reaction. The key technology of this reaction is the development of solid catalysts. Catalysts are the core of this fluorocarbon production process. Due to the high reaction temperature in the production process, the reaction raw materials and products are easily Dehydrohalogenation occurs to produce olefin by-products, which causes carbon on the surface of the catalyst and accelerates the coking and deactivation of the catalyst. The carbon-containing residues or organic pollutants formed by the cracking or oligomerization o...

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Problems solved by technology

[0005] For the current fluorination catalysts during the operation of industrial devices, the surface of the fluorination catalysts is prone to carbon deposition, causing some of the pores on the surface to be blocked and the active sites to be covered, thereby greatly reducing its catalytic activity; at the same time, the surface of the fluorination catalysts is Contaminated harmful impurities also reduce its activity and significantly increase by-products; and the traditional regeneration method is not enough to regenerate the fluorination catalyst during the regeneration process, the active metal chromium is easily lost during the regeneration process, and the activity of the regenerated fluorination catalyst decreases The technical problems such as faster, the present invention provides a kind of regeneration method of new fluorination catalyst, described regeneration method first removes the harmful impurity (metal oxide such as potassium oxide, sodium oxide) accumulated on the surface of fluorination catalyst by pickling, then Calcined in an oxidizing gas to remove carbon deposits, then soaked in the active replenishing liquid to reload the fluorinated catalyst with active substances, and finally activated

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