Anolyte clarifying tank waste chlorine gas recovery technology in ionic membrane caustic soda production

Abstract

The invention belongs to the field of waste recycling, and particularly relates to an anolyte clarifying tank waste chlorine gas recovery technology in the ionic membrane caustic soda production. The waste acid water generated by a chelate resin tower of a twice brine purification process is added into an anolyte clarifying tank, and a chlorine gas collection pipeline is added to the original chlorine gas pipeline of the anolyte clarifying tank and joins a chlorine gas manifold to enter the production system. The technology provided by the invention can recycle the waste chlorine gas of the anolyte clarifying tank in the ionic membrane caustic soda production, the chlorine gas purity meets the requirement of greater than or equal to 96% of the production system, and the caustic soda consumption of a waste chlorine gas absorption tower is effectively reduced; and meanwhile, the resin regeneration acid water can be recycled, and the economic and social benefits are relatively great.

Description

technical field [0001] The invention belongs to the field of waste recovery and utilization, and in particular relates to a process for recovering waste chlorine gas from an anolyte cleaning tank in the production of ionic membrane caustic soda. Background technique [0002] At present, the production of caustic soda in China is mainly based on the ionic membrane process. The anolyte discharge tank in the electrolysis process of ionic membrane soda production is one of the continuous operation equipment. . After the saturated chlorine water enters the anolyte discharge tank, the pressure of the chlorine water changes accordingly, and a large amount of waste chlorine gas escapes. The common practice in the industry is to discharge the waste chlorine gas to the waste chlorine gas absorption tower, and neutralize it with caustic soda for harmless disposal. Produce a large amount of waste sodium hypochlorite solution, also consume a large amount of caustic soda simultaneously, ...

AI Technical Summary

Problems solved by technology

After the saturated chlorine water enters the anolyte discharge tank, the pressure of the chlorine water changes accordingly, and a large amount of waste chlorine gas escapes. The common practice in the industry is to discharge the waste chlorine gas to the waste chlorine gas absorption tower, and neutralize it with caustic soda for harmless disposal. A large amount of waste sodium hypochlorite solution is produced, and a large amount of caustic soda is also consumed at the same time, so there is a big waste problem

In addition, the daily regeneration of the chelating resin tower in the secondary brine refining process will produce waste acid water, which is directly discharged after neutralization treatment, and the utilization of waste acid water has also not been realized

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