Solid CO2-philes as potential phase-change physical solvents for CO2
The binary phase behavior of mixtures of CO{sub 2} and highly CO{sub 2}-philic solids has been determined at 298 K. The solids include sugar acetates (β-d-galactose pentaacetate, β-d-ribofuranose tetraacetate, α-d(+)-glucose pentaacetate, d-(+)-sucrose octaacetate), tert-butylated aromatics (2,4-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 3,5-di-tert-butylphenol, 1,2,4-triacetoxybenzene), and a highly oxygenated cyclic compound (1,3,5-trioxane). The results are presented in the form of phase behavior (Px) diagrams at 298 K that exhibit either one (vapor–liquid–solid, VLS) or two (vapor–liquid–liquid, VL{sub 1}L{sub 2} and vapor–liquid–solid, VL{sub 2}S) three-phase equilibrium lines. Ternary phase behavior at 298 K has also been determined and presented in the form of a pseudo-binary Px diagram for mixtures of an equimolar gas blend of CO{sub 2} and H{sub 2} and each of these CO{sub 2}-philic solids and several other previously identified highly CO{sub 2}-philic compounds. Only four compounds, sucrose octaacetate, 1,3,5-tri-tert-butylbenzene, 2,4-di-tert-butylbenzene, and 1,3,5-trioxane, melted at 298 K in the presence of the CO{sub 2}/H{sub 2} mixture at three-phase vapor–liquid–solid pressures ranging between 6 MPa and 10 MPa. These four compounds are candidates for the selective absorption of CO{sub 2} from a CO{sub 2}/H{sub 2} mixture using solid compounds that can melt and selectively absorb CO{sub 2}.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- FE0004000
- OSTI ID:
- 1052710
- Report Number(s):
- TPR-3580; UNIV 128
- Journal Information:
- Journal of Supercritical Fluids, Vol. 61, Issue C; ISSN 0896-8446
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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