Clathrate phase equilibria for the water phenol carbon dioxide system

Clathrate phase equilibria for the ternary water-phenol-carbon dioxide system containing one-guest and two-host components were studied Three four-phase equilibrium loci for this ternary system were determined over wide temperature and pressure ranges. A quintuple point, thermodynamically unique, and invariant condition appeared in this type of ternary system, was carefully measured, and were 293. 7 K and 57.2 bar. At this quintuple point, five individual phases of water-rich liquid, phenol-rich liquid, carbon dioxide-rich liquid phenol clathrate, and vapor could coexist in equilibrium. A new experimental technique was used to determine the liquid-phase compositions coexisting with phenol clathrates at the isobaric conditions of 30.0 bar and six temperatures ranging from 278.2 and 303.2 K. A potential applicability of the clathration process to phenol separation from aqueous solutions was demonstrated in terms of phenol concentrations based on carbon dioxide-free concentration. In particular, phenol separation by using high-pressure carbon dioxide as a clathrate-inducing agent could be applied even to multiphase aqueous solutions over an entire range of phenol concentrations.
Publisher
AMER INST CHEMICAL ENGINEERS
Issue Date
1997-07
Language
ENG
Keywords

HYDRATE FORMATION; AQUEOUS-SOLUTIONS; SUPERCRITICAL EXTRACTION; HYDROGEN-SULFIDE; METHANE; PROPANE; ETHANE; GLYCOL

Citation

AICHE JOURNAL, v.43, no.7, pp.1884 - 1893

ISSN
0001-1541
URI
http://hdl.handle.net/10203/8983
Appears in Collection
CBE-Journal Papers(저널논문)
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