Shahriar Osfouri

Errors in experimental data and measurements cause data that is unreliable, so this data needs to be examined for use. The purpose of this research is to design a test for the thermodynamic consistency of experimental data of phase equilibrium at constant temperature, based on the Gibbs-Duhem equation.In this study, 6 samples of lean gas condensate fluid have been investigated .For this purpose, consistency test has been done using MATLAB software, and compressibility factor and fugacity coefficient have been obtained using PR equation of state. By replacing these values in Gibbs-Duhem equation , the thermodynamic consistency test has been performed.The results show that fluid sample 1 is thermodynamically inconsistency with a very large deviation. Fluid sample number 2 with 17 components has 1 thermodynamically consistency component and 16 thermodynamically inconsistency components, fluid sample number 3 with 17 components has 3 thermodynamically consistency components and 14 thermodynamically inconsistency components, fluid sample number 4 has one thermodynamically consistency component and 16 thermodynamically inconsistency components. Fluid sample number 5 with 17 components has 2 thermodynamically consistency components and 15 thermodynamically inconsistency components, and fluid sample number 6 out of 17 components has 2 consistency components and 15 thermodynamically inconsistency components.