Process for producing refined ammonium hydroxide through deacidification of residual ammonium hydroxide

Abstract

The invention relates to a process for producing refined ammonium hydroxide through deacidification of residual ammonium hydroxide. The residual ammonium hydroxide exchanges heat with ammonia distilling wastewater at the bottom of an ammonia distilling tower and is then mixed with acid solution into the top of a deacidification tower, then free ammonia in the residual ammonium hydroxide can be converted into fixed ammonia so that escape of ammonia can be inhibited, and then acid gas escapes via the top of the deacidification tower; the ammonium hydroxide with the acid gas removed is mixed withalkali liquor and then fed in via the top of the ammonia distilling tower for ammonia distillation; under the action of the alkali liquor, the fixed ammonia in the ammonium hydroxide can be convertedinto free ammonia, which then escapes via the top of the ammonia distillation tower and is then condensed by a condenser into ammonia products. According to the process for producing the refined ammonium hydroxide through deacidification of the residual ammonium hydroxide, by reasonably and orderly adding in the acid solution and the alkali liquor, acid components and alkali components in the residual ammonium hydroxide can be desorbed step by step, so that ammonium hydroxide distillation can be completed and meanwhile the ammonia products can be effectively recovered, the product applicationrange can be expanded, and the economic benefits can be increased for enterprises.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to a process for producing refined ammonia water by removing acidic components in the residual ammonia water from coking by using residual ammonia water from coking as a raw material. Background technique [0002] After the raw gas is sprayed and cooled by circulating ammonia water, the condensate in the raw gas is mixed with the circulating ammonia water, most of which are reused as circulating ammonia water, and the remaining part is sent to the ammonia distillation section as residual ammonia water to be filtered and degreased for ammonia water distillation . [0003] The remaining ammonia water contains a certain amount of free ammonia and fixed ammonia, as well as a small amount of hydrogen cyanide, hydrogen sulfide and carbon dioxide. The existing residual ammonia water treatment process distills acidic components and ammonia together by adding alkali at a ...

AI Technical Summary

Problems solved by technology

[0004] As the country's environmental protection requirements become increasingly strict, flue gas desulfurization and denitrification has become a common process, and the demand for ammonia products has gradually increased. Greatly limit the application of this part of ammonia products

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