Thermodynamic Properties of Sulfur Dioxide

Temperature Pressure Density Volume Int. energy Enthalpy Entropy C, CT Sound speed Joule-Thomson 

The values in these tables were generated from the NIST REFPROP software (Lemmon, E. W., McLinden, M. O., and Huber, M. L., NIST Standard Reference Database 23 Reference Fluid Thermodynamic and Transport Properties—REFPROP, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, Md., 2002, Version 7.1). The primary source for the thermodynamic properties is Lemmon, E. W., and Span, RChem. Eng. Data, 51(3) 785-S50, 2006. Validated equations for the viscosity and thermal conductivity are not currently available for this fluid. 

The uncertainty in density of the equation of state ranges from 0.1% at low temperatures in the liquid and vapor to 0.5% at the highest temperatures. The uncertainty in heat capacities is 2%, and the uncertainty in vapor pressure is 0.4% at temperatures above 270 K. The uncertainty in vapor pressure increases at lower temperatures due to the lack of experimental data. In the critical region, the uncertainties are higher for all properties except vapor pressure. 

Temperature K Pressure MPa Density mol/dm3 Volume dm3/mol Int. energy kj/mol Enthalpy kj/mol Entropy kJ/(mol-K) C kJ/(mol-K) CT kJ/(mol-K) Sound speed m/s Joule-Thomson K/MPa 

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Table 8. Physical and Thermodynamic Properties of Sulfur Dioxide...

Taken from Thermodynamic Properties of Sulfur Dioxide, by D. F. Rynning and C. O. Hurd, Transactions of the American Institute of Chemical Engineers, XLI. 

Nitta, T. Itami, J. Katayama, T. A study of the thermodynamic properties of sulfur dioxide - ethanol and sulfur dioxide - diethyl ether systems from measurements of vapor pressure and UV-specfrum. J. Chem. Eng. Jpn. 1973, 6, 303-309. 

The thermodynamic properties of sulfur trioxide, and of the oxidation reaction of sulfur dioxide are summarized in Tables 3 and 4, respectively. Thermodynamic data from Reference 49 are beheved to be more accurate than those of Reference 48 at temperatures below about 435°C. 

Polt, A. Maurer, G. (1992). The Bender equation of state for describing thermodynamic properties of krypton, neon, fluorine, sulfur dioxide and water over a wide range of state. Fluid Phase Equil, 73,27-38. 

Physical Properties. Sulfur dioxide [7446-09-5] SO2, is a colorless gas with a characteristic pungent, choking odor. Its physical and thermodynamic properties ate Hsted in Table 8. Heat capacity, vapor pressure, heat of vaporization, density, surface tension, viscosity, thermal conductivity, heat of formation, and free energy of formation as functions of temperature ate available (213), as is a detailed discussion of the sulfur dioxide—water system (215). 

A survey was made of more than 100 materials for possible use as condensable substance in the insulation space of a transfer line. Most were readily eliminated from consideration because ofundesirable thermodynamic properties, lack of availability, toxic properties, or high cost. Three materials were deemed potentially suitable for this use carbon dioxide (CO2), sulfur dioxide (SO2), and nitric oxide (NO). Carbon dioxide was chosen because it is more readily available in a rather pure form, it is cheaper than the other two, and it is not a suffocating gas like sulfur dioxide. 

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