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Received: 11 September 1974; Revised: 12 November 1974; Accepted: 13 November 1974 |
| A thermodynamic framework has been established to calculate equilibrium vapor-liquid compositions for dilute aqueous solutions of one or more volatile weak electrolytes: ammonia, carbon dioxide, hydrogen sulfide, sulfur dioxide, and hydrogen cyanide, in the temperature range 0° to 100°C and for liquid-phase concentrations from 10-4 to 1 or 2 molal. |
| Binary electrolyte-water parameters are obtained from reduction of experimental data for single-solute solutions. Additional parameters required for multi-solute systems are estimated from correlations. These parameters, coupled with chemical equilibria, are used to predict multicomponent vapor-liquid equilibria. At a fixed temperature, either liquid-phase or vapor-phase compositions may be calculated if the composition of the other phase is known. Although the framework has no adjustable parameters for multisolute systems, predicted and observed equilibria are in good agreement for two ternary systems: ammonia-hydrogen sulfide-water and ammonia-carbon dioxide-water. |
http://www.uregina.ca/engg/co2/calorimetry.htm
"Natural gas or flue gases purification require the removal of acidic impurities, carbon dioxide and hydrogen sulphide. The removal process of these acid gases requires the knowledge the solubility of the gases in the solvent and the enthalpy of absorption and desorption of the gases in the solvent. "
The calorimeter used in this study is the C 80, a high-performance Calvet type calorimeter manufactured by Setaram (Lyon, France). The instrument allows a very large amount of applications in various fields to be performed. The instrument can be operated from ambient temperature to 300 °C and up to a pressure of 100 bars. It is equipped with a reversing mechanism and mixing vessels with membranes, liquid heat capacity cells. The calorimeter is equipped a with state of the art software for data collection and processing.
The calorimeter is used to measure the heat of solution of carbon dioxide in physical solvents (TTEGDME), the heat capacity of aqueous solutions of alkanolamines and mixed solvents. Enthalpic data for mixing of water and other solvents are important to the understanding of the variation in molecular interaction between molecules. It will also be used to measure the heat of reaction of carbon dioxide with various alkanolamines and amine blends. There is a great need for new calorimetric data for a variety of systems of interest.
