The solubility data of sodium 4-nitrotoluene-2-sulfonate (NTSNa) and 4-nitrotoluene-2-sulfonic acid (NTS) in (sulfuric acid + water) mixture solvents were measured at temperatures ranging from 285 K to 340 K using a dynamic method. The solute-free mass fraction of sulfuric acid (w0,3) in solvent mixtures ranged from 0 to 0.70. NTS showed the lowest solubility when w0,3 is 0.60. After the sulfonation reaction, the reaction solution should be diluted to the concentration 0.60 mass fraction of sulfuric acid to make NTS precipitate as much as possible. Solubility of NTS is much larger than that of NTSNa when w0,3 is smaller than 0.20, but no obvious solubility difference can be detected when w0,3 is larger than 0.50. This result shows that only when w0,3 is smaller than 0.20, the recycle process which was designed by our previous study can be carried out. The solubility data were correlated by the modified Apelblat model, the calculated (solid + liquid) equilibrium curves are in good agreement with the experimental data.
Compounds
#
Formula
Name
1
C7H7NO5S
2-methyl-5-nitrobenzenesulfonic acid
2
C7H6NNaO5S
sodium 2-methyl-5-nitrobenzenesulfonate
3
H2O4S
sulfuric acid
4
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.