Regeneration method of copper base hydrodearsenic catalyst

Abstract

The invention proposes a regeneration method of copper-based arsenic casting agent, which belongs to the regeneration method of impurity casting catalyst in the petrochemical industry field, and solves the problems of the industrial device in domestic and abroad at present that the arsenic casting agent can be regenerated and is scrapped after being used for one time to result in the environmental pollution. Firstly, nitrogen gas is used to purge a bed layer at a low temperature, and then the temperature is heated up and the bed layer is purged again with nitrogen gas or water vapor, and the temperature of the bed layer is lowered to 200 to 220 DEG C, oxygen gas or air is gradually added into the nitrogen gas or water vapor for residual burning, when the temperature of the bed layer is steady, the temperature of the bed is gradually increased, and the content of oxygen gas is gradually increased, the regeneration is finished when the temperature of the bed is basically identical, and then the temperature is decreased to dry. The arsenic casting effect of the arsenic casting agent regenerated by the regeneration method of the invention is basically restored, and the invention has industrial application and realizes significant economic benefit.

Description

Regeneration method of copper-based arsenic removal agent technical field The present invention relates to a regeneration method for impurity-removing catalysts used in petrochemical industry, more specifically, the present invention relates to a regeneration method for de-arsenic agents used for cracking raw oil. Background technique Naphtha is the main raw material for ethylene cracking and steam reforming to produce hydrogen, and the arsenic in naphtha will poison subsequent catalysts. Therefore, arsenic-containing naphtha needs to be de-arsenic before cracking. Existing methods for removing arsenic include: (1) hydrogen peroxide-cumene method, which easily produces waste liquid containing arsenic, which pollutes internal components and the environment; low, low arsenic capacity, short operation cycle, large consumption, a large amount of spent catalysts are difficult to deal with in time, and are likely to cause environmental pollution; (3) nickel molybdate-cobalt mol...

AI Technical Summary

Problems solved by technology

However, the arsenic removal agents used in industry at home and abroad are all disposable, and are discarded directly after one use. The use cycle of the arsenic removal agent is short, the operating cost is high, and it causes environmental pollution.

And there is no report on the regeneration of the arsenic removal agent