SOLUBILITY OF LIQUID TETRAHYDROTHIOPHENE IN THE MAIN COMPONENTS OF NATURAL-GAS (CH4, CO2 AND N-2) BY MEANS OF A STATICAL DEVICE COUPLED WITH AN ONLINE GAS-CHROMATOGRAPHIC ANALYSIS

Some odorous products as tetrahydrothiophene (THT) whose odour is perc eived at low concentration, are injected in natural gas in order to od orize it. This artificial odorization allows to detect immediately any gas leak in atmosphere.The authors have measured the equilibrium comp ositions of gaseous phases for binaires THT-CH4, THT-N-2 and THT-CO2 i n the tranport and distribution conditions of natural gas [ 1 < P (bar < 60 et -30 < t(degrees C) < 50]. For this purpose an experimental de vice based on a principle of dynamic saturation coupled with an on-lin e gas chromatographic analysis was assembled and adjusted. Additional thermodynamic properties are required to know the molar composition of vapour phase. The authors have measured the THT vapour pressure and e stimated the second virial coefficients. For the estimations it was ne cessary to know the critical values and the acentric factor that have been calculated with various correlations.