Irreversible reaction

Lime mud calcination (biogenic carbonate carbon)

CaCO3CaO+CO2

Direction
Irreversible
Processes
2
Stated as
Fixed conversion, Stoichiometry only
Heat of reaction
ΔH = 178,320 kJ/kmol (one process)
Heat of reaction
ΔH = 178,300 kJ/kmol (one process)
Element balance
Checked: balances in all 2 processes
As the processes state itStoichiometry, conversions, heats of reaction and catalyst windows are taken from each process's files with their provenance. The build checks only that each process's equation balances in every element, from the process's own component formulas; it does not check the numbers. A process's design maturity applies to them.

Species

SpeciesNameCASRoleCoefficient
CaCO3Calcium carbonate471-34-1reactant-1
CaOCalcium oxide1305-78-8product1
CO2Carbon dioxide124-38-9product1

In the processes

  • Bleached softwood kraft pulp with chemical recovery (1000 ADt/d market pulp, concept)Concept · not reviewed

    CALC · Lime mud calcination (biogenic carbonate carbon)CaCO3 → CaO + CO2B

    Element balance
    Balances in every element
    Heat of reaction
    ΔH = 178,320 kJ/kmol at 298.15 K, as written (given: CaCO3(calcite) -> CaO(s) + CO2(g) at 298.15 K, 178.32 kJ/mol: NASA Glenn polynomials (McBride, Gordon and Reno 1993, NASA TM-4513) in Cantera 3.2.0, as reported by cheme process furnace (process/furnaces.yaml, core 7bed468); replaces the recalled NBS values (review 2026-10-28-pfd-lci-review#6))
  • Soda ash by the Solvay ammonia-soda process (1000 t/d light ash, concept)Concept · not reviewed

    CALC · Limestone calcination (lime kiln)CaCO3(s) → CaO(s) + CO2(g)

    Stated as
    Fixed conversion
    Element balance
    Balances in every element
    Conversion
    95 % of CaCO3 (assumed: D-004, process/furnaces.yaml)
    Heat of reaction
    ΔH = 178,300 kJ/kmol at 298.15 K, as written (assumed: formation enthalpies CaCO3(s) -1207.6, CaO(s) -635.1, CO2(g) -393.5 kJ/mol (NBS tables, D-007))

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

  1. CaCO3(calcite) -> CaO(s) + CO2(g) at 298.15 K, 178.32 kJ/mol: NASA Glenn polynomials (McBride, Gordon and Reno 1993, NASA TM-4513) in Cantera 3.2.0, as reported by cheme process furnace (process/furnaces.yaml, core 7bed468); replaces the recalled NBS values (review 2026-10-28-pfd-lci-review#6)

    For the heat of reaction · cited by Bleached softwood kraft pulp with chemical recovery (1000 ADt/d market pulp, concept)

  2. D-004, process/furnaces.yaml

    For the conversion · cited by Soda ash by the Solvay ammonia-soda process (1000 t/d light ash, concept)

  3. formation enthalpies CaCO3(s) -1207.6, CaO(s) -635.1, CO2(g) -393.5 kJ/mol (NBS tables, D-007)

    For the heat of reaction · cited by Soda ash by the Solvay ammonia-soda process (1000 t/d light ash, concept)