The catalytic gasoline contains black powdery impurities
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The raw material for our company’s catalytic units is hydrogenated residue oil, which has been processed by a residue oil hydrogenation unit; the resulting gasoline is then fed into a gasoline selective hydrogenation desulfurization unit (with an inlet temperature of around 60 degrees). Currently, the filter before the feed to the gasoline hydrogenation unit is being flushed frequently, and there is a large amount of black powdery impurities in the filter screen; this situation has persisted for many days. What causes this? I hope the teachers can help answer this. Thank you!
Is it present in the catalyzed feed oil, crude vapor, and stabilized gasoline? Can it be determined what the black powder is?
Could it be gum-like substances formed in gasoline? You can perform compositional analysis on these impurities!