Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Solid liquid equilibrium (SLE) measurements for disodium 4,4'-dinitrostilbene-2,2'-disulfonate (DNSNa) and sodium 4-nitrotoluene-2-sulfonate (NTSNa) in aqueous ethylene glycol monoethyl ether solution and aqueous ethylene glycol monobutyl ether solution were conducted using a dynamic method over the temperature range from (280 to 335) K. A synergistic effect on DNSNa solubility was observed with the maximum solubility at solute-free mass fraction of ethylene glycol monoethyl ether w0 3 = 0.4000 and solute-free mass fraction of ethylene glycol monobutyl ether w0 4 = 0.5999, respectively. The solubility data were correlated using the thermodynamic electrolyte non-random two-liquid (E-NRTL) model and model parameters were determined simultaneously. Aqueous ethylene glycol monobutyl ether solution at solute-free mass fraction of ethylene glycol monobutyl ether w0 4 = 0.2000 was found to be suitable solvent medium for the oxidation of 4-nitrotoluene-2-sulfonic acid (NTS) to 4,4'-dinitrostilbene-2,2'-disulfonic acid (DNS) and the conclusion was confirmed using the static analytical method combined with UV VIS spectrophotometer.