Liquid-Vapor Phase Equilibrium Curves for Individual Components

2 LIQUID-VAPOR PHASE EQUILIBRIUM CURVES FOR INDIVIDUAL COMPONENTS 

For individual components, a two-parameter approximation [7-9] of pressure vs. temperature dependence along the phase equilibrium curve is used  

For water, HP, and n-tetradecane (to simulate JPF), the liquid-vapor phase equilibrium curves have the following explicit formulae  

Parameters a and A for water and n-tetradecane were determined by using tables of thermodynamic data [11. 10] for HP they were calculated by using nonlinear regression and eight points on a four-parameter P(7 )-curve approximation [11]  

Considering HP as an individual substance and a component of solution, the authors digress from considering the kinetic issues of its stability in terms of decomposition and other chemical transformation. This is acceptable if the local characteristic time of attaining the conditional thermodynamic equilibrium (at frozen chemical composition of the solution) is less than the characteristic times of chemical relaxation. The probability of violation of this condition increases with temperature. Here, quantitative criteria for the existence of this type of conditional equilibrium are not formulated. 

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