Phase equilibrium liquid-vapour in the nitrogen dioxide-nitric acid system. Fazovoe ravnovesie zhidkost'-par v sisteme dioksid azota-azotnaya kislota

Nitrogen dioxide being used as a coolant in some nuclear facilities, its production chemistry and purification techniques are of practical interest. The experimental dependence is obtained of the boiling temperature on the solution composition of nitric acid in nitrogen dioxide and of nitrogen dioxide in nitric acid at the atmospheric pressure by use of Cotrell's ebulliometer. The numerical solution of Gibbs-Duhem's equation in view of solution heats of the components gives the parameters of the phase equilibrium liquid-vapour. The results obtained are tabulated and recommended for designing rectification processes.