In this work sodium salts solubility data were obtained for relevant systems involved in crude glycerol purification processes. Several binary and ternary mixtures of glycerol + water and glycerol + water + alcohol were saturated with sodium chloride (NaCl), sodium sulfate (Na2SO4) and sodium phosphate (Na3PO4) under different conditions and their respective solubility values were determined. The studied variables were the glycerol:water mass ratio (2:1, 4:1, 9:1), temperature (T = 293, 303 and 313 K) and type and alcohol concentration added to the mixture as anti-solvent at p = 0.1 MPa; ethanol, methanol and isopropyl alcohol were added as anti-solvents from 0 to 70 wt% for NaCl, and up to 40 wt% for Na2SO4 and Na3PO4 (in salt-free base glycerol + water + alcohol mixtures). Solubility, measured as the total content of anhydrous inorganic salt dissolved in the mixtures, was determined gravimetrically and using UV spectroscopy. The obtained results show the best anti-solvent effect by isopropyl alcohol followed by ethanol, with major efficiencies observed at higher alcohol concentrations. The water content in the mixture increased sodium salts solubility. Na3PO4 exhibit the lowest solubility values in the studied systems. Temperature effect was almost negligible in the studied range.
Compounds
#
Formula
Name
1
ClNa
sodium chloride
2
Na3O4P
trisodium phosphate
3
Na2O4S
sodium sulfate
4
C3H8O3
glycerol
5
H2O
water
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.