Solve the problem of high sulfate content in the alkaline absorption output of Claus plant exhaust gases
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Dear experts: I am a production manager involved in the process of producing sodium sulfite through alkaline absorption of exhaust gases from sulfur recovery (Claus) units. After years of tuning, the operation of these units has been very stable. The sodium sulfite produced by our company features an excellent crystal form and high brightness. However, the content of sodium sulfite is between 90% and 93%; analysis shows that the remaining component is mainly sodium sulfate. Does any expert have a good method to increase the content of sodium sulfite? I appreciate your kind guidance. Thank you.
This post was last edited by qugd on 2021-3-29 at 14:27. This requirement is very difficult. Except for sulfates, other low-valent thiosulfates are not very stable and have a tendency to absorb oxygen from the air and turn into sulfates. To prevent it from oxidizing, the only option is to isolate air from all operations that come into contact with it during the production process, which can be very costly. Also, use deoxygenated water as much as possible.
Are there experts in the alkali absorption process for carbon disulfide Claus off-gases? Please pay attention to this issue.