Solubility of small-chain carboxylic acids in supercritical carbon dioxide

Journal Article · 08 July 2010 · Journal of Chemical and Engineering Data

DOI: https://doi.org/10.1021/je100504h · OSTI ID:1079590

Sparks, Darrell L. ^[1]; Estevez, L. Antonio ^[2]; Hernandez, Rafael ^[1]; McEwen, Jason ^[1]; French, Todd ^[1]

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1. Mississippi State Univ., Mississippi State, MS (United States)
2. Univ. of Puerto Rico, Mayaguez (Puerto Rico)

The solubility of heptanoic acid and octanoic acid in supercritical carbon dioxide has been determined at temperatures of (313.15, 323.15, and 333.15) K over a pressure range of (8.5 to 30.0) MPa, depending upon the solute. The solubility of heptanoic acid ranged from a solute concentration of (0.08 ± 0.03) kg • m^-3 (T = 323.15 K, p = 8.5 MPa) to (147 ± 0.2) kg • m^-3 (T = 323.15 K, p = 20.0 MPa). The lowest octanoic acid solubility obtained was a solute concentration of (0.40 ± 0.1) kg • m^-3 (T = 333.15 K, p = 10.0 MPa), while the highest solute concentration was (151 ± 2) kg • m^-3 (T = 333.15 K, p = 26.7 MPa). In addition, solubility experiments were performed for nonanoic acid in supercritical carbon dioxide at 323.15 K and pressures of (10.0 to 30.0) MPa to add to the solubility data previously published by the authors. In general, carboxylic acid solubility increased with increasing solvent density. The results also showed that the solubility of the solutes decreased with increasing molar mass at constant supercritical-fluid density. Additionally, the efficacy of Chrastil's equation and other density-based models was evaluated for each fatty acid.

• Research Organization: Mississippi State Univ., Mississippi State, MS (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: FG36-06GO86025
• OSTI ID: 1079590
• Report Number(s): DOE/GO-8602531
• Journal Information: Journal of Chemical and Engineering Data, Vol. 55, Issue 11; ISSN 0021-9568
• Publisher: American Chemical SocietyCopyright Statement
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
HEPTANOIC ACID
NONANOIC ACID
OCTANOIC ACID
PRESSURE RANGE
density-based model
fluid densities
heptanoic acid
nonanoic acid
octanoic acids
pressure ranges
solubility data
solute concentrations
solvent density
super-critical
supercritical carbon dioxides