Irreversible reaction

Oxidation of MnO2 to potassium manganate in KOH with air (roaster)

2MnO2+4KOH+O22K2MnO4+2H2O

Direction
Irreversible
Processes
1
Stated as
Fixed conversion
Heat of reaction
ΔH = -112,740 kJ/kmol (one process)
Element balance
Checked: balances
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
MnO2Manganese dioxide1313-13-9reactant-2
KOHPotassium hydroxide1310-58-3reactant-4
O2Oxygen7782-44-7reactant-1
K2MnO4Potassium manganate10294-64-1product2
H2OWater7732-18-5product2

In the processes

  • Potassium permanganate from MnO2 ore by KOH roasting and electrolysis (1250 kg/h, concept)Concept · not reviewed

    OX · Oxidation of MnO2 to potassium manganate in KOH with air (roaster)2 MnO2(s) + 4 KOH + O2 → 2 K2MnO4 + 2 H2O(g)

    Stated as
    Fixed conversion
    Phase
    mixed
    Element balance
    Balances in every element
    Conversion
    90 % of MnO2 (assumed: D-004: ASSUMED below the > 95 % US 5011672 reports for its atomiser-plate reactor (Description); roasting with air at about 225 degC and KOH melts of 65-90 wt% are the routes US 5660712 names (Background))
    Heat of reaction
    ΔH = -112,740 kJ/kmol at 298.15 K, as written (assumed: formation enthalpies K2MnO4(s) -1184.1, H2O(g) -241.8, MnO2(s) -520.0, KOH(s) -424.8 kJ/mol (NBS tables, D-009))

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. D-004: ASSUMED below the > 95 % US 5011672 reports for its atomiser-plate reactor (Description); roasting with air at about 225 degC and KOH melts of 65-90 wt% are the routes US 5660712 names (Background)

    For the conversion · cited by Potassium permanganate from MnO2 ore by KOH roasting and electrolysis (1250 kg/h, concept)

  2. formation enthalpies K2MnO4(s) -1184.1, H2O(g) -241.8, MnO2(s) -520.0, KOH(s) -424.8 kJ/mol (NBS tables, D-009)

    For the heat of reaction · cited by Potassium permanganate from MnO2 ore by KOH roasting and electrolysis (1250 kg/h, concept)