The regenerated solvent becomes of poor quality
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There are various reasons for the deterioration of the sulfur regeneration solvent. Could a high level of sulfur dioxide in the sulfur quenching exhaust gases be responsible for this deterioration? Please share your opinions; points will be given for helpful responses
The presence of sulfur dioxide in the exhaust gas from the quench tower indicates that the hydrogenation process was not properly controlled, allowing sulfur dioxide to penetrate. On one hand, this leads to a sharp drop in the pH of the quench water, thereby increasing corrosion; on the other hand, it results in the formation of thiosulfates in the solvent, which reduces the efficiency of desulfurization in that solvent.