Preparation method of catalyst for oxidization of hydrogen chloride for chlorine production

Abstract

The invention discloses a preparation method of a catalyst for oxidization of hydrogen chloride for chlorine production. A catalyst precursor is prepared from the following components in percentage by mass: 50 to 60 percent of a component A, 35 to 50 percent of a component B, 1 to 2 percent of a component C and 3 to 5 percent of a component D, wherein the component A is chromic oxide; the component B is copper oxide; the component C is one or more of K<+>, Na<+> and Cs<+>; the component D is silicon oxide. The preparation method is characterized by comprising the following hydrogen chloride oxidization catalyst preparation steps: firstly, grinding the component A and the component B to obtain mixed metal oxide powder; secondly, immersing and modifying the metal oxide powder through the component C; finally, adding the component D, granulating and pressing the components, roasting, and carrying out fluorinated pore-forming activation through HF, thus obtaining the efficient hydrogen chloride oxidization catalyst.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a catalyst used to oxidize hydrogen chloride to produce chlorine. Background technique [0002] Chlorine is an important basic chemical raw material, widely used in polyurethane, silicone, chlorinated hydrocarbons, epoxy resin, chlorinated rubber, chlorinated high polymer and other new material industries, and in new energy industries such as polysilicon manufacturing. Used in household fine chemical industries such as disinfectants, detergents, food additives, cosmetic additives, etc., used in the synthesis of glycerin, chlorobenzene series, chloroacetic acid, benzyl chloride, PCl 3 Pesticide / pharmaceutical industries, as well as paper, textile, metallurgy and petrochemical industries. [0003] Almost all chlorine gas in industry is produced by electrolysis of sodium chloride aqueous solution. This method has two big problems: firstly, its power cons...

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Problems solved by technology

[0003] Almost all chlorine gas in industry is produced by electrolysis of sodium chloride aqueous solution. This method has two big problems: first, its power consumption reaches 2760kWh / ton, and the power consumption of the entire chlor-alkali industry accounts for about 100% of the total industrial consumption in the country. About 5% of electricity; followed by the co-production of sodium hydroxide while producing chlorine gas. Due to the rapid development of the chlorine-consuming industry in recent years, a large amount of excess capacity of sodium hydroxide has been caused

This preparation method improves the catalyst preparation process of Tsinghua University, but it is still only applicable to fluidized beds, which is not conducive to large-scale industrial promotion

[0012] Although the catalytic oxidation process of hydrogen chloride in the fluidized bed reaction system has been studied in detail internationally for many years, the conditions for large-scale industrialization have still not been achieved.

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