Under the Hood: Chemistry Behind French Creek Programs
Recorded: January 23, 2014
Length: 13:24
Take a look at the calculation engine of French Creek water treatment
modeling programs with French Creek, President, Robert J. Ferguson. Topics
include scale prediction and solubility chemistry.
Additional Resources
The table below compares the solubility of common scales at 25°C and 50°C, and provides a note on the
general solubility trends as temperature increases. Please note that the solubilities are shown as
solubility product and as the compound. The compound values are for reference only. Please
note that solubility trends are more complicated than two points can demonstrate. Gypsum
solubility, for example, increases with temperature to the 20°C to 30°C range and then decreases
with further increase in temperature.
|
Solubility Product Comparison |
| Scale Forming Species |
Formula |
Mineral Name |
Ksp 25°C (mg/L)
|
Ksp 50°C (mg/L) |
Solubility
Change As
Temperature
Increases
|
| Calcium carbonate |
CaCO3 |
Calcite |
4.27e-9 (6.84) |
2.81e-9 (3.81) |
Decreases |
| Calcium sulfate |
CaSO4*2H2O |
Gypsum |
2.62e-5 (881) |
2.42e-5 (778) |
Increases then Decreases |
| Barium sulfate |
BaSO4 |
Barite |
1.07e-10 (2.20) 2 |
2.16e-10 (5.75) |
Increases |
| Strontium sulfate |
SrSO4 |
Celestite |
2.23e-7 (89.6) |
1.85e-7 (63.6) |
Increases then Decreases |
| Silica |
SiO2 |
Amorphous Silica |
1.95e-3 (103) |
3.48e-3 (209) |
Increases |
| Tricalcium phosphate |
Ca3(PO4)2 |
|
2.00e-29 (0.56) |
4.68e-30 (0.42) |
Decreases |
From: "The
Chemistry of Strontium and Barium Scales"
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