polistirene da stirene

flowchart LR benzeneAlkylationToEB["alchilazione benzene + etilene → EB"] ebDehydrogenationToStyrene["deidrogenazione catalitica etilbenzene"] styrenePolymerizationToPS["polimerizzazione stirene → PS"] s_benzene(["benzene"]):::role_rawMaterial s_benzene --> benzeneAlkylationToEB s_ethylene(["C2H4"]):::role_rawMaterial s_ethylene --> benzeneAlkylationToEB s_zeoliteAcid(["zeolite acida (ZSM-5)"]):::role_catalyst s_zeoliteAcid -.-> benzeneAlkylationToEB s_ethylbenzene(["etilbenzene"]):::role_intermediate benzeneAlkylationToEB --> s_ethylbenzene s_ethylbenzene --> ebDehydrogenationToStyrene s_ironOxideCatalyst(["catalizzatore Fe2O3-K2O"]):::role_catalyst s_ironOxideCatalyst -.-> ebDehydrogenationToStyrene s_styrene(["stirene"]):::role_intermediate ebDehydrogenationToStyrene --> s_styrene s_hydrogen(["idrogeno"]):::role_byproduct ebDehydrogenationToStyrene -.-> s_hydrogen s_styrene --> styrenePolymerizationToPS s_polystyrene(["polistirene"]):::role_finalProduct styrenePolymerizationToPS --> s_polystyrene classDef role_rawMaterial fill:#e8f4ff,stroke:#06c,color:#003 classDef role_finalProduct fill:#e8ffe8,stroke:#0a7,color:#030 classDef role_intermediate fill:#f0f0f0,stroke:#666,color:#333 classDef role_byproduct fill:#fff4e0,stroke:#cc7a00,color:#642 classDef role_waste fill:#fae8e8,stroke:#888,stroke-dasharray:3 3,color:#444 classDef role_utility fill:#e0f7f7,stroke:#06c8c8,color:#033 classDef role_catalyst fill:#fde0f0,stroke:#cc3399,color:#506 classDef role_mine fill:#f5e6d3,stroke:#8b5a2b,color:#3d2e15,stroke-width:2px

PREFIX chem: <https://ontology.siletto.it/chem-pipeline#>
SELECT ?role ?substance WHERE {
  ?substance chem:playsRole ?ra .
  ?ra chem:role ?role ; chem:inPipeline chem:polystyrenePipeline .
} ORDER BY ?role