I have a question: Why does the pre-sulfidization of hydrogenation catalysts cause the pH value of the quench water in the quench tower to drop to around 2?
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I have a question: Why does the pre-sulfiding of the exhaust gas hydrogenation catalyst cause the pH value of the quench water in the quench tower to drop to around 2? I’ve always been puzzled: based on the reaction mechanism, sulfur dioxide shouldn’t be produced in such large quantities, so the pH of the quenching water shouldn’t be that low!
During the presulfurization of exhaust gas hydrogenation catalysts, the sulfurizing agents used (such as sulfur, H2S, etc.) react with hydrogen on the catalyst surface to produce small amounts of SO2 and other sulfides. These sulfur dioxide or other sulfur-containing gases may enter the quench tower along with the exhaust gases, where they dissolve in water to form sulfuric acid and sulfurous acid, thereby causing a significant decrease in the pH value of the quench water. Therefore, even if no significant amount of sulfur dioxide is produced directly in the reaction equation, side reactions and the decomposition of the sulfidizing agent during the process can still lead to the acidification of the quench water. .
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