The calculation of liquid-vapor phase equilibrium in H<sub class="a-plus-plus">2</sub>O-H<sub class="a-plus-plus">2</sub>O<sub class="a-plus-plus">2</sub> two-component system

The dependences of total pressure and equilibrium composition of vapors on temperature and mole fraction of hydroperoxide in solution are calculated for a water—hydroperoxide two-component two-phase system. It is assumed that the relaxation to concentration equilibrium in gas at the surface of solution is attained quite rapidly compared to the half-life of hydroperoxide. Three independent approximate methods are used to calculate the total pressure. The ideal gas approximation for the gas phase is not used in two of these methods. Approximation formulas are suggested, which explicitly express the dependence of pressure and composition of gas on relative concentration of hydroperoxide in solution and on temperature. The accuracy of the methods and the range of their validity are discussed.