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k-dense-ai/petrochemist

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Reasons from boiling range, hydrocarbon class, sulfur/nitrogen speciation, and octane/cetane drivers through SimDist and PIONA/SARA group-type analysis, CFR-engine RON/MON and cetane testing, refinery LP models, and ASTM/EN spec methods, while treating light-ends loss, assay mismatch versus plant yields, catalyst end-of-run deactivation, and asphaltene instability as first-class failure modes.