The phase equilibria for the system KOH K2CrO4 Al2O3 H2O and its subsystems at 150 deg C in a high alkali concentrated region were investigated. In the concentrated alkali region of the system and its subsystem KOH Al2O3 H2O, the equilibrium solid-phase K2O*Al2O3*2H2O was found. This is different from the system KOH Al2O3 H2O at low temperature from which the equilibrium solid-phase K2O*Al2O3*3H2O was discovered. The salting-out effect of KOH and potassium aluminate to K2CrO4 is strong. These findings can provide a significant and precious database for the production of K2CrO4 and the removal of alumina from the concentrated alkali solution that is produced in the chromate cleaner production process.
Compounds
#
Formula
Name
1
HKO
potassium hydroxide
2
CrK2O4
potassium chromate(VI)
3
Al2O3
aluminum oxide (Al2O3)
4
H2O
water
5
K2O
dipotassium oxide
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.