Irreversible reaction

Seeded gibbsite precipitation

NaAlO2+2H2OAl(OH)3+NaOH

Direction
Irreversible
Processes
1
Stated as
Fixed conversion
Heat of reaction
ΔH = -20,590 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
NaAlO2Sodium aluminate (dissolved; NaAl(OH)4 less 2 H2O)1302-42-7reactant-1
H2OWater7732-18-5reactant-2
Al(OH)3Gibbsite14762-49-3product1
NaOHSodium hydroxide1310-73-2product1

Also stated as Al(OH)3 + NaOH → NaAlO2 + 2 H2O.

In the processes

  • Alumina by the Bayer process (3000 t/d smelter-grade alumina, concept)Concept · not reviewed

    PREC · Seeded gibbsite precipitationNaAlO2(aq) + 2 H2O(l) → Al(OH)3(s) + NaOH(aq)

    Stated as
    Fixed conversion
    Phase
    mixed
    Element balance
    Balances in every element
    Conversion
    41.03 % of NaAlO2 (assumed: D-006: from the A/C of the precipitator feed (pregnant liquor + seed liquor) to the spent A/C 0.38; scripts/bayer_balance.py)
    Heat of reaction
    ΔH = -20,590 kJ/kmol at 298.15 K, as written (assumed: reverse of DIG)

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-006: from the A/C of the precipitator feed (pregnant liquor + seed liquor) to the spent A/C 0.38; scripts/bayer_balance.py

    For the conversion · cited by Alumina by the Bayer process (3000 t/d smelter-grade alumina, concept)

  2. reverse of DIG

    For the heat of reaction · cited by Alumina by the Bayer process (3000 t/d smelter-grade alumina, concept)