Preparation tank and preparation system for sodium sulfite solution used for chlor-alkali industry

Abstract

The invention discloses a preparation tank and a preparation system for a sodium sulfite solution used for the chlor-alkali industry, and belongs to the technical field of preparing sodium sulfite solutions used for the chlor-alkali industry. The main body of the preparation tank is provided with a protective gas connection port, and protective gas can be fed into the main body of the preparationtank after the connection port is connected to a protective gas supply device, thereby reducing the oxidation situation during a sodium sulfite solution preparation process. In addition, since the sodium sulfite solution is not oxidized during the preparation process, the prepared sodium sulfite solution can be directly stored in the main body of the preparation tank, a special storage tank structure separately arranged is not needed and long-time storage can be achieved, and therefore, the frequency of preparation can be reduced by increasing the volume of the main body of the preparation tank. The main body part of the preparation tank can be installed underground to avoid the need of manual transportation to a high place and reduce the labor intensity.

Description

technical field [0001] The invention relates to the technical field of preparing sodium sulfite solution for chlor-alkali, in particular to a preparation tank and a preparation system for sodium sulfite solution for chlor-alkali. Background technique [0002] The brine system in the chlor-alkali industry generally uses 10% sodium sulfite solution to remove free chlorine in brine, and its use points are: [0003] A. For dechlorination: chemical dechlorination after vacuum dechlorination of brine from the electrolysis tank; [0004] B. One-time refined brine: the refined brine before entering the resin tower after the primary brine is refined; [0005] C. Membrane denitrification: pretreatment of brine for membrane denitrification. [0006] At present, most enterprises in the chlor-alkali industry use bagged industrial sodium sulfite with a content of 97%, and add pure water to prepare a 10% sodium sulfite solution; the preparation tank used for the configuration adopts the ...

AI Technical Summary

Problems solved by technology

[0009] 3. The adding flow is easy to fluctuate: the chlor-alkali industry generally sets the sodium sulfite preparation tank in the light brine dechlorination process. During each process of brine refining and membrane denitrification and transferring sodium sulfite solution, it is easy to cause fluctuations in the adding flow of light brine dechlorination, thus Causes chain switching of dechlorinated light brine containing free chlorine and membrane denitrification devices, which is not conducive to system stability

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