Irreversible reaction

Reduction of the crude's iodine by sodium thiosulfate in the wash

I2+2Na2O3S22NaI+Na2O6S4

Direction
Irreversible
Processes
1
Stated as
Fixed conversion
Heat of reaction
ΔH = -30,000 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
I2Iodine7553-56-2reactant-1
Na2O3S2Sodium thiosulfate7772-98-7reactant-2
NaISodium iodide7681-82-5product2
Na2O6S4Sodium tetrathionate13721-29-4product1

In the processes

  • Iodomethane from methanol, red phosphorus and iodine, batch reflux reaction and batch distillation (500 t/a)Concept · not reviewed

    THIO · Reduction of the crude's iodine by sodium thiosulfate in the washI2 + 2 Na2O3S2 → 2 INa + Na2O6S4

    Stated as
    Fixed conversion
    Phase
    liquid
    Element balance
    Balances in every element
    Conversion
    100 % of I2 (assumed: ASSUMED (D-008): the thiosulfate is in excess and the patent washes until the crude is decolourised (CN 114195616 B, Examples 1-3))
    Heat of reaction
    ΔH = -30,000 kJ/kmol at 298.15 K, as written (assumed: ASSUMED order (D-008): no open formation enthalpies of the aqueous thiosulfate and tetrathionate ions were read; about -30 kJ per mol iodine; the batch's iodine to the wash is small, so its heat is bounded in scripts/balance.py)

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. CN 114195616 B, Examples 1-3: the crude decolourised with sodium thiosulfate solution, twice

    For the reaction · cited by Iodomethane from methanol, red phosphorus and iodine, batch reflux reaction and batch distillation (500 t/a)

  2. ASSUMED (D-008): the thiosulfate is in excess and the patent washes until the crude is decolourised (CN 114195616 B, Examples 1-3)

    For the conversion · cited by Iodomethane from methanol, red phosphorus and iodine, batch reflux reaction and batch distillation (500 t/a)

  3. ASSUMED order (D-008): no open formation enthalpies of the aqueous thiosulfate and tetrathionate ions were read; about -30 kJ per mol iodine; the batch's iodine to the wash is small, so its heat is bounded in scripts/balance.py

    For the heat of reaction · cited by Iodomethane from methanol, red phosphorus and iodine, batch reflux reaction and batch distillation (500 t/a)