Experimental and thermodynamical studies of the phase equilibria for carbon dioxide in liquified natural gas components at 77-219K
Experimental and thermodynamical studies of the phase equilibria for carbon dioxide in liquified natural gas components at 77-219K
The phase equilibria of carbon dioxide in liquefied natural gas components at cryogenic temperature as binary and ternary mixtures have been experimentally measured using Fourier transform infrared spectroscopy in conjunction with a specially designed variable pressure/temperature cryostat (pathlength 2mm; pressure up to 30 bar). Solid carbon dioxide has been found to be comparatively soluble in liquid nitrogen (3.25x10-6 mole fraction), liquid methane (1.08x10-4 mole fraction), liquid ethane (2.5x10-2 mole fraction) and liquid propane (6.87x10-2 mole fraction) at their normal boiling temperatures. The solubilities of carbon dioxide in various cryogens increased with increasing temperature. The solubilities of carbon dioxide in ternary systems, e.g. liquid nitrogen/liquid methane, liquid nitrogen/liquid ethane and liquid methane/liquid ethane were considerably enhanced compared to those values for binary systems. The vapour-liquid equilibria as a function of temperature for liquid nitrogen/liquid methane, liquid nitrogen/liquid ethane and liquid methane/liquid ethane have been measured. The liquid nitrogen/liquid ethane mixture was found to be partially immiscible. In order to obtain the density values for solvent mixtures, several published equations were reviewed and the COrresponding STAtes Liquid Density (COSTALD) equation was found to be the most appropriate. The thermodynamic equations relating to solid-liquid equilibria at ambient temperatures have been reviewed and found to be inappropriate for predicting molecular solubilities at very low temperatures. Modification of Guggenheim's quasi-chemical statistical model has, however, resulted in general equations for binary and ternary systems which gives satisfactory agreement with the experimental data. eject
University of Southampton
1988
Yun, Sang-Kook
(1988)
Experimental and thermodynamical studies of the phase equilibria for carbon dioxide in liquified natural gas components at 77-219K.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The phase equilibria of carbon dioxide in liquefied natural gas components at cryogenic temperature as binary and ternary mixtures have been experimentally measured using Fourier transform infrared spectroscopy in conjunction with a specially designed variable pressure/temperature cryostat (pathlength 2mm; pressure up to 30 bar). Solid carbon dioxide has been found to be comparatively soluble in liquid nitrogen (3.25x10-6 mole fraction), liquid methane (1.08x10-4 mole fraction), liquid ethane (2.5x10-2 mole fraction) and liquid propane (6.87x10-2 mole fraction) at their normal boiling temperatures. The solubilities of carbon dioxide in various cryogens increased with increasing temperature. The solubilities of carbon dioxide in ternary systems, e.g. liquid nitrogen/liquid methane, liquid nitrogen/liquid ethane and liquid methane/liquid ethane were considerably enhanced compared to those values for binary systems. The vapour-liquid equilibria as a function of temperature for liquid nitrogen/liquid methane, liquid nitrogen/liquid ethane and liquid methane/liquid ethane have been measured. The liquid nitrogen/liquid ethane mixture was found to be partially immiscible. In order to obtain the density values for solvent mixtures, several published equations were reviewed and the COrresponding STAtes Liquid Density (COSTALD) equation was found to be the most appropriate. The thermodynamic equations relating to solid-liquid equilibria at ambient temperatures have been reviewed and found to be inappropriate for predicting molecular solubilities at very low temperatures. Modification of Guggenheim's quasi-chemical statistical model has, however, resulted in general equations for binary and ternary systems which gives satisfactory agreement with the experimental data. eject
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Published date: 1988
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Local EPrints ID: 461197
URI: http://eprints.soton.ac.uk/id/eprint/461197
PURE UUID: d22442e6-a569-411e-83c6-8e6185e79db3
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Date deposited: 04 Jul 2022 18:38
Last modified: 04 Jul 2022 18:38
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Author:
Sang-Kook Yun
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