Reactions of keten. Part II. The thermodynamics of the gas-phase equilibrium: acetic acid + keten ? acetic anhydride

Abstract

The gas-phase equilibrium CH₃·CO₂H + CH₂·CO (CH₃·CO)₂O has been studied over the temperature range 171–289°C, starting from both sides. The value of K is given by the equation log (K atm^–1)= 4579/T– 6·738, ΔH°=–87·5 kJ mol^–1, and ΔS°=–128·8 JK^–1 mol^–1. The results are compared with values calculated from the kinetic parameters of the forward and backward reactions.