Method for producing acid through desulfuration, decyanation and concentration of coke oven gas

Abstract

A method for producing acid through desulfuration, decyanation and concentration of coke oven gas. The method for producing the acid through desulfuration, decyanation and concentration of the coke oven gas comprises the following steps of (1) sending the coke oven gas which needs to be treated into the lower portion of a desulfuration device, and making the coke oven gas in contact with absorption barren liquor which is sprayed from the top of the desulfuration device; (2) adding an organic compound catalyst into absorption rich liquor which runs out of the desulfuration device, cooling a mixture after pressing the mixture, and then sending the mixture and compressed air into the bottom of an oxidation device; (3) sending the absorption barren liquor which runs out of the upper portion ofthe oxidation device to a subsequent acid production working procedure after concentrating the absorption barren liquor in a concentration device; and (4) sending concentrate into an acid productiondevice, and producing the concentrated sulfuric acid through an incineration acid production technology. According to the method for producing the acid through desulfuration, decyanation and concentration of the coke oven gas, the self-developed organic compound catalyst is used as a wet oxidation catalyst, generated desulfuration waste liquid does not contain sulfur, after evaporation concentration or membrane concentration is adopted, the traditional incineration acid production technology is used for producing the concentrated sulfuric acid, and regenerated tail gas and concentrated exhaustgas are all purified and recovered, so that the defects of the prior art are overcome, and the requirements of relative industries are met.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification, and specifically relates to a process method for desulfurization, decyanation, concentration and acid production of coke oven gas. Background technique [0002] In the 1950s and 1960s, my country had the arsenic-alkali method, the ammonia water catalytic method, and the domestic Nanhua Institute, Sichuan Chemical Plant and Wusong Gas Plant jointly developed the improved ADA method in the early 1960s. However, these methods always have one or another disadvantage. For example, the arsenic-alkali method has been eliminated because the arsenic-containing lye is too toxic and harmful to humans. Ammonia catalysis method, the main catalyst is hydroquinone, which has poor activity, and the sulfur is too fine, which is easy to block the tower, so this method is not ideal. Later, other catalysts were added, such as the PDS developed by Northeast Normal University, and then gradually de...

AI Technical Summary

Problems solved by technology

However, these methods still have deficiencies. For example, high-pressure wet oxidation is used for the treatment of waste liquid in Tahis method. After high-temperature and high-pressure wet oxidation, the waste heat steam is not fully utilized, resulting in high power consumption, and the manufacture of the reaction tower is difficult, so it is difficult to popularize; AS method desulfurization and desulfurization Cyanide efficiency is not very high, desulfurization and decyanation, deamination, ammonia steaming and sulfur recovery must be connected together, local problems will affect the entire desulfurization and decyanation production, and the economic benefits are not good

[0009] 3. Large investment, poor operation stability and high energy consumption