A note on the temperature dependence of Henry's Law coefficients for methanol and ethanol

Measurements reported in the literature of gas–liquid partition coefficients for methanol and ethanol dissolved in water are compiled and critically evaluated to establish the temperature dependence. The data are linearly correlated in the ln(KH[mol dm−3 atm−1]) versus reciprocal absolute temperature coordinate frame and, when treated by a linear regression analysis, yield: ln(KH)=−(12.46±0.25)+(5312.4±76.0)/T in the case of methanol (0–80 °C) and ln(KH)=−(15.87±0.82)+(6274.0±241.6)/T in the case of ethanol (0–60 °C). The measurements at 25 °C average to KH(298.15)=(2.16±0.14)×102 mol dm−3 atm−1 (n=8) and KH(298.15)=(1.94±0.13)×102 mol dm−3 atm−1 (n=8), respectively. Enthalpies of solution derived from the temperature dependence are 44.17±0.63 kJ mol−1 for methanol and 52.16±2.01 kJ mol−1 for ethanol.