produzione polpa kraft (processo al solfato)

flowchart LR kraftCausticizing["causticizzazione + make-up Na2SO4 (prep white liquor)"] kraftDigestion["cottura digestore kraft (170 C, 1 MPa)"] kraftBleaching["sbiancamento ECF (ClO2 + O2 + H2O2)"] s_sodiumHydroxide(["sodium hydroxide"]):::role_rawMaterial s_sodiumHydroxide --> kraftCausticizing s_sodiumSulfate(["solfato di sodio"]):::role_rawMaterial s_sodiumSulfate --> kraftCausticizing s_whiteLiquor(["white liquor kraft (NaOH + Na2S)"]):::role_intermediate kraftCausticizing --> s_whiteLiquor s_sodiumSulfide(["solfuro di sodio"]):::role_byproduct kraftCausticizing -.-> s_sodiumSulfide s_woodChipsKraft(["chips legno tenero (feed kraft)"]):::role_rawMaterial s_woodChipsKraft --> kraftDigestion s_whiteLiquor --> kraftDigestion s_brownPulp(["polpa kraft bruna non sbiancata"]):::role_intermediate kraftDigestion --> s_brownPulp s_blackLiquor(["black liquor kraft"]):::role_byproduct kraftDigestion -.-> s_blackLiquor s_brownPulp --> kraftBleaching s_kraftPulp(["polpa kraft sbiancata"]):::role_finalProduct kraftBleaching --> s_kraftPulp 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:kraftPulpPipeline .
} ORDER BY ?role