Reversible reaction

2SO2+O22SO3

Direction
Reversible (an equilibrium)
Processes
1
Stated as
Fixed conversion
Heat of reaction
ΔH = -197,800 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
SO2Sulfur dioxide7446-09-5reactant-2
O2Oxygen7782-44-7reactant-1
SO3Sulfur trioxide7446-11-9product2

In the processes

  • Sulfuric acid from sulfur burning, double contact / double absorption (1000 t/d, 98.5 wt%)Concept · not reviewed

    SO2_OXSO2 + 1/2 O2 ⇌ SO3

    Scale
    Written at 0.5 times the scale
    Stated as
    Fixed conversion
    Element balance
    Balances in every element
    Conversion
    63 % of SO2 (assumed: bed 1 (D-005); each bed step gives its own fraction of the bed inlet SO2)
    Heat of reaction
    ΔH = -98,900 kJ/kmol at 298.15 K, as written (given: ideal-gas formation enthalpies of materials.yaml (CRC), 298.15 K)
    Catalyst
    Vanadium pentoxide on silica (alkali-promoted) · active phase V2O5 · promoters K2SO4
    Operating window
    663.15–903.15 K (390–630 °C), 100–250 kPa (1–2.5 bar) (assumed: cheme chemistry library sulfuric_acid (Ullmann's, Sulfuric Acid and Sulfur Trioxide); confirm with the catalyst vendor (D-005))

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. cheme chemistry library sulfuric_acid (Ullmann's, Sulfuric Acid and Sulfur Trioxide, doi:10.1002/14356007.a25_635)

    For the reaction · cited by Sulfuric acid from sulfur burning, double contact / double absorption (1000 t/d, 98.5 wt%)

  2. bed 1 (D-005); each bed step gives its own fraction of the bed inlet SO2

    For the conversion · cited by Sulfuric acid from sulfur burning, double contact / double absorption (1000 t/d, 98.5 wt%)

  3. ideal-gas formation enthalpies of materials.yaml (CRC), 298.15 K

    For the heat of reaction · cited by Sulfuric acid from sulfur burning, double contact / double absorption (1000 t/d, 98.5 wt%)

  4. Ullmann's Encyclopedia of Industrial Chemistry, Sulfuric Acid and Sulfur Trioxide, doi:10.1002/14356007.a25_635

    For the catalyst · cited by Sulfuric acid from sulfur burning, double contact / double absorption (1000 t/d, 98.5 wt%)

Starter template

A starting template is in the ChemE-as-Code toolkit (Sulfuric acid (contact process, SO2 oxidation)): cheme chemistry library sulfuric_acid --add

Templates bring the stoichiometry, the components and typical catalysts; most give no conversion or kinetics, and their sources are general references, not this reaction's processes.