Enthalpy of dilution of [SO2+salt+H2O] in [salt+H2O] {salt = (NH4)(2)SO4 or Na2SO4}: Experimental results and modeling

Kamps APS; Ermatchkov V; Meyer E; Maurer G

Thermochimica Acta, Vol.429, No.2, 189-203, 2005

DOI10.1016/j.tca.2005.03.005 Export Citation

Enthalpy of dilution of [SO2+salt+H2O] in [salt+H2O] {salt = (NH4)(2)SO4 or Na2SO4}: Experimental results and modeling

Kamps APS, Ermatchkov V, Meyer E, Maurer G

New experimental results are presented for the enthalpy change upon diluting aqueous solutions of sulfur dioxide containing a salt (either ammonium sulfate or sodium sulfate) in aqueous solutions of that salt at about 313 and 352 K. A previously developed thermodynamic model for the vapor-liquid equilibrium of the chemical reacting systems {SO2 + (NH4)(2)SO4 + H2O} and (SO2 + Na2SO4 + H2O) is extended allowing for the formation of pyrosulfite and for the description of the new experimental results for the enthalpy change upon dilution. (c) 2004 Elsevier B.V. All rights reserved.

Keywords:enthalpy of dilution;sulfur dioxide;ammonium sulfate;sodium sulfate;chemical reacting aqueous solutions