PVT measurements of carbon dioxide+methane mixtures and an equation of state development /
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| Other Authors: | , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1988.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | A mixture apparatus has been constructed for preparing mixtures of accurately known composition using a gravimetric method and has been used to prepare mixtures needed in this study. Two experimental techniques have been used to measure accurately the densities of carbon dioxide + methane mixtures over wide ranges of temperature and pressure. A continuously weighed pycnometer which can provide one density measurement about every twenty minutes in an isothermal run has been used to measure densities of four carbon dioxide + methane mixtures from 225 to 350 K up to 35 MPa. The Burnett apparatus can provide the best low density measurements and the best determinations of the virial coefficients; it has been used to obtain the densities and virial coefficients for four carbon dioxide + methane mixtures and pure methane at 300 and 320 K up to 10 MPa. The accuracy of the density measurements using the pycnometer is 0.1 kg/m3 or 0.1%, whichever is greater, and that of the Burnett apparatus is 0.023 %. The second virial coefficients of the four mixtures and pure methane reported have an absolute error of 0.3 cm3/mol and second cross virial coefficients of this mixture at 300 and 320 K have an estimated error of 0.5 cm3 /mol. The third virial coefficients have an estimated error of 50 cm6/mol12. An innovative approach to the reference system of an EOS has been developed. It consists of three parts: 1.) the choice of a proper pair potential and its division into reference and perturbation potentials; 2.) the method used to calculate the effective hard-sphere diameter; and 3.) different forms for the hard-body equations. We have investigated step-ramp and Born (exponential) pair potentials, and Carnahan-Starling and random closest packing basis hard-body equations. The random closest packing basis hard-body equation plus Born pair potential provides the best representation of the experimental saturated liquid densities and vapor pressures of argon. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Chemical Engineering." |
| Physical Description: | x, 111 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |