The deuterium-protium separation factor, a, between molecular hydrogen and liquid methylamine in the presence of potassium methylamide catalyst has been measured at low deuterium concentrations over the temperature range-50 to+ 5 “C. The separation factor is about 10% larger than that for liquid ammonia, and its dependence upon absolute temperature, T, is given by In a= 0.1135+(240.05/T)+(43989/p). The equilibrium constant, ...