H.M. Lin

Cubic chain-of-rotators equation of state and vle calculations

Abstract A cubic equation of state is developed based on the concept of perturbation theory to include the rotational contribution of molecular motion in addition to the repulsive and attractive contributions. Carnahan-Starlings repulsive contribution and Chiens rotational contribution are simplified to give the final equation a cubic form. The new equation represents the vapor pressure and saturated liquid density for diverse substances over the entire liquid range. Application is made to mixtures with emphasis on fluid phase equilibria.

Gas—liquid equilibrium in mixtures of methane + m-xylene, and methane + m-cresol

Abstract Simnick, J.J., Sebastian, H.M., Lin, H.M. and Chao, K.C., 1979. Gas—liquid equilibrium in mixtures of methane + m-xylene, and methane + m-cresol. Fluid Phase Equilibria, 3: 145–151. Compositions of saturated equilibrium liquid and vapor phases are determined in a flow apparatus for methane + m-xylene mixtures at 190, 230, 270, and 310° C and up to 200 atm 1 ; and for methane + m-cresol at 190, 270, 350, and 390° C and up to 250 atm.

Gas-liquid equilibrium in mixtures of hydrogen + m-xylene and + m-cresol

Abstract Gas-liquid equilibrium has been determined for two binary mixtures of hydrogen: with m -xylene and with m -cresol. A flow apparatus was used to reduce residence time of the fluids in the apparatus, thus making possible measurement at elevated temperatures without causing significant thermal decomposition of the organic compounds. Experimentally observed compositions of the gas and liquid mixtures are reported at four temperatures from 462 to 582 K for hydrogen + m -xylene, and at six temperatures from 462 to 662 K for hydrogen + m -cresol. At each temperature observations were made at seven pressures from 2 to 25 MPa. Vapor pressures of the solvents at the reported temperatures were also measured.

Gas—liquid equilibria in mixtures of carbon dioxide and tetralin at elevated temperatures

Abstract Gas—liquid equilibrium in carbon dioxide and tetralin mixtures was experimentally determined at four temperatures: 190, 270, 350, and 390°C. At the three lower temperatures observations were made at pressures from 20 to 50 atm. At the highest temperature, pressures were from 30 to 50 atm.

Cubic chain-of-rotators equation of state for polar fluids

Abstract Like the van der Waals and Redlich-Kwong equations, the Cubic Chain-of-Rotators (CCOR) equation of state is a perturbation type of equation expressing pressure as a difference between repulsive and attractive pressures. Unlike the previous cubic equations the repulsive pressure of the CCOR equation expresses the molecular dynamics results of hard spheres and the rotational contribution of polyatomic molecules. For non-polar fluids the equation is generalized in the form of corresponding states. For polar fluids specific values of the equation constants are determined for 45 substances. The equation accurately represents the vapor pressure of non-polar and polar fluids and the saturated liquid density of non-polar fluids. Vapor-liquid equilibrium of non-polar and polar fluid mixtures is described at pressures from the ambient up to elevated pressures. The cross interaction parameters change significantly with temperature for some high pressure polar mixtures.

Vapor-liquid equilibrium in nitrogen + 1-methylnaphthalene mixtures at elevated temperatures and pressures

Abstract Lin, H.M., Kim, H. and Chao, K.C., 1983. Vapour-liquid equilibrium in nitrogen + 1-methylnaphthalene mixtures at elevated temperatures and pressures. Fluid Phase Equilibria, 10: 73–76. Compositions of saturated vapor and liquid phases at equilibrium were experimentally determined for nitrogen + 1-methylnaphthalene mixtures at four temperatures from 462 to 703 K over a pressure range of 2–25 MPa.

Calculation of excess enthalpies with the CCOR equation of state

Abstract The cubic chain-of-rotators (CCOR) equation of state was applied to calculate excess enthalpies for a variety of binary mixtures. The systems of interest include non-polar and polar compounds with emphasis on asymmetric mixtures under diverse conditions in both gaseous and liquid states. The calculations were, in general, satisfactory to within acceptable accuracy for a majority of mixtures, although significant deviations from experimental data were found for some systems. Possible reasons for the errors were discussed.

Experimental investigation of synthesis gas solubility in fischer-tropsch reactor slurry

A semi-flow apparatus has been designed and constructed for investigation of the phase equilibrium behavior of synthesis gas and products in a Fischer-Tropsch slurry reactor. The apparatus provides contact for a flowing gas stream with a stationary liquid and is suited for the determination of gas solubility in a molten wax of high melting point. To verify attainment of equilibrium, the new apparatus has been tested with a mixture of carbon dioxide and toluene. The test data agree well with the experimental results of Ng and Robinson from a static apparatus. Measurement has been completed for the solubility of hydrogen and of carbon monoxide in n-eicosane, n-octacosane, and in n-hexatriacontane at three temperatures (100, 200, and 300° C) and five pressures (10, 20, 30, 40, and 50 atm). Solubility of synthesis gas mixtures of H2 and CO in n-octacosane was also determined at three gas compositions (40.01, 50.01, and 66.64 mol % of hydrogen), and two temperatures (200 and 300° C) for each gas mixture.

Gas—liquid equilibria in ternary mixtures of hydrogen + methane + 1-methylnaphthalene at elevated temperatures and pressures

Abstract Gas—liquid equilibria in ternary mixtures of hydrogen + methane + 1-methylnaphthalene were investigated at two temperatures 542 and 704 K and at pressures from 50 to 250 atm. Relative concentration of hydrogen to methane was varied, and three observations made at each condition of temperature and pressure. The response of the K -values to changing compositions was determined.