A method and system for recovering elemental sulfur and regenerating catalysts loaded with sulfur

Abstract

The invention discloses a method and system for recovering elemental sulfur and regenerating a sulfur-loaded catalyst. The sulfur-loaded catalyst is soaked in an ammonia sulfide solution. time; after the two leaching solutions of the steps are combined, high-temperature nitrogen gas is used to strip elemental sulfur, and the gas stripping tail gas is condensed and discharged after purification treatment. The elemental sulfur is obtained by drying; the catalyst after twice soaking and extraction is washed and dried to become a regenerated catalyst; the invention can avoid the high temperature and high pressure conditions of the traditional desulfurization method, and the sulfur on the catalyst is thoroughly leached with high efficiency, and the reaction device is simple and convenient. It is safe and reliable, and the low temperature and low pressure reaction conditions are conducive to energy saving. Using this method to recover elemental sulfur, the sulfur extraction rate of ammonia polysulfide solution can reach more than 98%.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration and sulfur recovery, and in particular relates to a method and system for recovering and regenerating elemental sulfur from a catalyst loaded with sulfur. Background technique [0002] Catalytic reduction of SO by CO 2 The generated elemental sulfur will be deposited on the catalyst, and harsh conditions are required to extract the generated elemental sulfur from the catalyst. Usually, the external conditions required for elemental sulfur recovery and catalyst regeneration are very high. For example, the temperature required for hot soaking and charcoal burning process is as high as 450-500 °C, which requires high energy consumption, and it is necessary to prevent carbon deposition and accelerated aging of the catalyst; the hot soaking process catalyst Sulfur condensation may occur on the surface, although these problems can be avoided after special operation, but the sulfur recover...

AI Technical Summary

Problems solved by technology

Usually, the external conditions required for elemental sulfur recovery and catalyst regeneration are very high. For example, the temperature required for hot soaking and charcoal burning process is as high as 450-500 °C, which requires high energy consumption, and it is necessary to prevent carbon deposition and accelerated aging of the catalyst; the hot soaking process catalyst Sulfur condensation may occur on the surface. Although these problems can be avoided after special operation, the sulfur recovery rate of the device at this time is lower than that achieved by normal operation.

The sulfur recovery process has been widely studied at home and abroad, but there are still many technical problems in the process including the direct oxidation reactor. The formation process of liquid sulfur in the catalyst is affected by the operating temperature, or the formed by-product H 2 The generation of S is difficult to control

At present, the methods for recovering elemental sulfur and regenerating catalysts after loading sulfur are all dry methods, and there is no mention of wet methods using solution leaching.

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