Methanol: association behaviour, third-law entropy analysis and determination of the enthalpy of formation

Chemical equilibrium constants for the methanol from CO/H2 reaction calculated literature thermodynamic parameters are too high as compared to experimental results. Therefore, both entropy value and enthalpy of formation were reviewed. A rigorous analysis association behaviour vapour confirms that dimers cyclic tetramers play an important role, but physical non-ideal gas must also be taken into account. Accurate relationships contribution second virial coefficient derived with use a combined fit multiple data sources including heat capacity, speed sound, thermal conductivity, excess molar nitrogen vaporization. Additionally, temperature coefficients measures consistent dependencies included in parameter optimization support accuracy model. All results supporting or literature. The resulting equation state was used calculate new ideal-gas values methanol, which now turn out chemical data. Furthermore, third-law turns current value. is recommended improved relationship presented.