Antichlor and preparation method thereof

Abstract

The invention discloses an antichlor and a preparation method thereof. The antichlor uses a composite oxide as a carrier to be loaded with oxides of alkali metal and / or alkaline earth; the composite oxide carrier contains theta aluminum oxide and calcium oxide. The composite oxide carrier is prepared by a coprecipitation method; calcium oxide is introduced into a carrier framework structure; the breakthrough chlorine content can reach 17.6 percent at the normal temperature. Through high-temperature roasting, the prepared aluminum oxide with the theta material phase structure reduces the surface hydroxyl quantity; the physical adsorption of HCl on the antichlor is reduced to the maximum degree; the phenomenon of antichlor surface acidity enhancement due to HCl physical adsorption concentration is reduced, so that the phenomenon of green oil generation through olefin polymerization due to acid catalysis is reduced; the phenomenon of organic chloride generation through reaction of olefin and HCl due to acid catalysis can be avoided. In addition, through the prepared composite oxide carrier, the intensity of the antichlor is obviously improved; the agglomeration or pulverization phenomenon under the water-containing steam work condition can be eliminated.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a dechlorination agent and a preparation method thereof. Background technique [0002] In recent years, the process of preparing propylene from propane dehydrogenation has developed rapidly in China, and the vast majority of manufacturers use the Oleflex process of UOP Company. Chlorides need to be introduced during the catalyst regeneration process of this process, and this part of chlorides eventually enters the reaction product in the form of HCl, thereby adversely affecting various aspects of the process flow. [0003] HCl is a harmful gas with high corrosiveness and high reactivity. Even a trace amount of HCl will adversely affect the subsequent production process. Its main industrial hazards are reflected in the following aspects: (1) Catalyst poisoning: Chlorine has strong acidity, which is easy to increase the acid catalytic function of the catalyst and increase...

AI Technical Summary

Problems solved by technology

[0005] The currently disclosed dechlorination agents pay less attention to the dechlorination process in a high-olefin environment. The product gas of propane dehydrogenation contains a large amount of olefins and some dienes, which are prone to polymerization under HCl catalyzed conditions to form green oil, which blocks dechlorination. In addition, olefins or diolefins will react with HCl to form organic chlorides, which cannot be effectively removed by dechlorination agents, and then enter downstream products, resulting in excessive chlorides

At the same time, the product gas of propane dehydrogenation contains a large amount of water, which may cause problems such as pulverization and hardening of the dechlorination agent

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