مسعود مفرحی

Hydrogen is known as the oldest molecule and is widely used in many industries for a variety of applications. Hydrogen solubility in various hydrocarbon solutions is one of the factors needed to design and optimize the operation of processes such as hydrogenation, hydrocracking and hydrotreatment. Refineries and petrochemical complexes are one of the industries where hydrogen is used extensively in them. Therefore, the solubility of hydrogen in the hydrocarbons used in these industries is important and effective. Alkenes are among the hydrocarbons that exist in the olefin units of the petrochemical industry. For this reason, the hydrogen solubility in alkenes is important and applicable to the petrochemical industry. In this work, the solubility of hydrogen in ethylene, propylene, 1-butene, 1-hexene, 1-heptene and 1-octene is investigated. the PR78 equation is used to calculate and predict the hydrogen solubility in alkenes. binary interaction parameter is obtained by fitting the equation of state on experimental data, group contribution method, Moysan and Gray correlation. The results show this model had lowest error when using the binary interaction parameter is obtained by fitting, Moysan, group contribution model, and gray method, respectively. Also, Henry's constant is calculated for all systems and a correlation is proposed for obtaining hydrogen Henry's constant. In addition, using PR78 equation of state, the thermodynamic consistency test was performed on the equilibrium data of the liquid and vapor phases of these systems it can be seen that of the 23 equilibrium data reported for liquid phase, 8 of which, about 34% of the data, do not have thermodynamic consistency and more than 50% of the vapor phase data was not thermodynamically consistent.