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[Truncated] Heat capacities and enthalpies are the basic thermodynamic quantities available through calorimetry. Accurate isobaric heat capacity,cp, enthalpy of fusion ?fusH, and enthalpy of vaporisation ?vapH data for hydrocarbon mixtures at low temperatures and high pressures are important to the design and operation of liquefied natural gas (LNG) plants. However relatively few experimental measurements of mixture heat capacities have been made at high pressure and low temperature due to the expensive and complicated equipment and procedures involved for determining accurate and reproducible data. The equations of state used to calculate the calorimetric properties of these mixtures are usually regressed only to pressure-volume-temperature (PVT) and vapour liquid equilibria (VLE) data, and their ability to provide accurate heat capacity data has been rarely tested. To illustrate this problem and highlight the need for such experimental data, substantial inconsistencies in the prediction of cp by two EOS of industrial importance: the GERG 2008 EOS1 as implemented in the software REFPROP 9.12 (GERG 2008) and the Peng Robinson EOS3 as implemented in the process simulation software Aspen HYSYS,4 (PR-HYSYS) for binary mixture of methane (1) + butane (4) with x1 = 0.60 have been demonstrated in this work. To help address this problem, a commercial differential scanning calorimeter (DSC) Setaram BT2.15 was converted to a specialized high-pressure cryogenic calorimeter for isobaric heat capacity measurements of mixtures of light hydrocarbons. The optimised DSC was adapted to enable measurements of the cp of pure liquids, binary and multi-component mixtures of light hydrocarbons, such as those representatives of mixtures in an LNG plant. Three key modifications to the commercial DSC were required to enable these accurate cryogenic, high-pressure liquid cp measurements: (1) improved methods of transferring liquid from the DSC calorimeter to stabilise the instrument's baseline; (2) incorporation of a ballast volume so that the liquid sample's thermal expansion did not cause significant pressure changes; and (3) active heating of the tubing connecting the sample cell to the ballast volume to prevent convective heat transfer at low temperatures. These modifications were validated by measurements of cp for liquid methane, ethane and propane over the ranges (108 to 258) K, (1.1 to 6.4) MPa, with relative standard deviations of the measurements from the reference EOS values for these pure fluids of 0.5 %, 1.0 % and 1.5 %, respectively.
Thermodynamic Diagrams for High Temperature Plasmas of Air, Air-Carbon, Carbon-Hydrogen Mixtures, and Argon provides information relating to the properties of equilibrium gas plasmas formed from hydrocarbons, from air without argon, from pure argon, and from mixtures of air and carbon at various compositions, temperatures and pressures. The data are presented in graphical rather than tabular form to provide a clearer picture of the plasma processes investigated. This book is composed of four chapters, and begins with the introduction to the characteristics of plasmas, with emphasis on their thermodynamic properties. The succeeding chapter deals with the theoretical basis of the computations of thermodynamic properties using a system of equations derived from quantized Boltzmann statistics. These topics are followed by discussions on the calculation of equilibrium compositions and the thermodynamic values for thermal plasmas. The final chapter describes proposed models on which the calculations are based. This book will prove useful to chemical technologists and researchers.