Kraft process black liquor is highly caustic and sulfide-bearing — evaporator tube sheets need corrosion resistance tuned specifically to that chemistry, not general chemical-processing defaults.
| Dominant Failure Mode | Caustic and sulfide-driven corrosion in kraft process black liquor |
| Governing Standard | General ASME/TEMA, material chosen per black liquor chemistry |
| Typical Material Default | Stainless Steel, Duplex, or Incoloy 825 for evaporator service |
| Typical Structural Type | Fixed or Floating, depending on the specific evaporator design |
Black liquor evaporator service often pushes beyond standard stainless.
Kraft process black liquor combines high causticity with sulfide compounds, creating a corrosion environment distinct from general chemical processing — material selection needs to account for that specific combination rather than general guidance.
Often, but severe or high-solids black liquor streams may warrant Incoloy or other nickel alloys — this is a case where sharing your specific liquor composition with our engineering team makes a real difference.
Yes, evaporator service is a recognized application within our materials range, and our engineering team can advise on the appropriate grade for your specific process chemistry.
Every enquiry is checked against governing code, material compatibility and manufacturing feasibility before a quote is issued. Use our product, material, grade and standards guides to freeze the RFQ — then confirm with engineering.
Send your fluid service, pressure class and governing standard — we'll confirm the right product and material.