A flow type of apparatus is built to give equilibrium gas and liquid samples at elevated pressures and temperatures while minimizing thermal decomposition. Saturated vapor and liquid compositions and K values are determined with this apparatus for the binary system hydrogen/tetralin (1,2,3,4-tetrahydronaphthalene) at SCOPEThis work extends experimental investigation of phase equilibrium of hydrogedheavy solvent systems to elevated pressures and temperatures of interest in hydro treating processes, particularly coal liquefaction processes. Information on the amount of dissolved hydrogen in the liquid phase is useful for analysis of reaction mechanism and for engineering design of blowdown and associated separation systems.Previous studies of the phase equilibrium of hydrogen/ solvent systems have been limited to relatively low temperatures. An exception is found in the work by Grayson and Streed (1963) in which a correlation of K values of hydrogen in heavy oils was presented for temperatures and pressures comparable to this work, but no detailed experimental data were given.The system hydrogedtetralin reported here is the first system studied in the new flow type of apparatus we have just built. The study is being continued with other hydrogen mixture systems. The data gathered with various types of solvents will contribute to the development of general quantitative description of the solubility of hydrogen in complex liquid mixtures. CONCLUSIONS AND SIGNIFICANCEVapor-liquid equilibrium in hydrogen/solvent systems has been the subject of a great deal of investigation owing to their industrial importance and scientific interest. The development of hydro treating and coal liquefaction processes generated renewed interest focused on conditions of high temperature and pressure and on heavy solvents. In this work we built a new flow type of apparatus and showed that equilibrium data can be obtained from it with small residence times of the samples in the high temperature zone. Thermal decomposition is minimized as residence time is reduced, making possible determination of equilibrium data at high temperatures that would otherwise lead to excessive decomposition.That equilibrium is attained in the apparatus at the conditions of operation is supported by the positive results obtained from three tests:1. The sample compositions are independent of flow rates within the range of flow rates employed.2. Data on hydrogedbenzene from our apparatus agree with results obtained by Connolly (1962) from a static apparatus.3. The new data on hydrogedtetralin satisfy the GibbsDuhem equation.Equilibrium saturated liquid and gas compositions and K values are determined for the binary system hydrogen/ tetralin at four temperatures (189. 6O, 268.7O, 348.6O, 389.1OC) and seven pressures (20, 30, 50, 100, 150, 200, 250 am). Henry constant of hydrogen is determined from the data. The results are useful for modeling the phase behavior of hydro treating and coal liquefaction processes. Since tetralin is widely used as a hydrogen-donor s...
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