Vapor - Liquid Equilibrium of Binary Mixtures Containing Supercritical Carbon Dioxide and Glycol Ethers at Elevated Pressures
碩士 === 國立臺灣科技大學 === 化學工程系 === 95 === A semi-flow type apparatus was employed in this study to measure the vapor-liquid equilibrium (VLE) data for four binary systems composed of carbon dioxide with one of following glycol ethers : ethylene glycol monopropyl ether, diethylene glycol methyl ether, die...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/kj8ua8 |
| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 95 === A semi-flow type apparatus was employed in this study to measure the vapor-liquid equilibrium (VLE) data for four binary systems composed of carbon dioxide with one of following glycol ethers : ethylene glycol monopropyl ether, diethylene glycol methyl ether, diethylene glycol dimethyl ether, and diethylene glycol monoethyl ether at temperatures from 333.15 K to 413.15 K and pressures up to 23 MPa or near the critical pressure of the mixtures. At a given condition, solubilities of the glycol ethers in carbon dioxide follow the sequence of ethylene glycol monopropyl ether ＞ diethylene glycol dimethyl ether＞ diethylene glycol methyl ether ＞ diethylene glycol monoethyl ether.
An empirical equation correlated well the saturated vapor composition of the heavy components in terms of the density of carbon dioxide. The VLE data were utilized to determine Henry’s constants with the Krichevsky – Ilinskaya（KI）equation. It was found that the Henry’s constant increased with increasing temperature for each system. The VLE data were also used to test the validity of several cubic equations of state with various mixing rules for VLE calculations of the investigated mixtures. The binary interaction constants were determined from both the bubble point pressure calculation and the flash calculation. It showed that the two-parameter van der Waals one-fluid mixing rule (Q2) generally yielded better results from the bubble point pressure calculation and the Mathias-Klotz-Prausnitz mixing rule (MKP) was preferable from the flash calculation.
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