Experimental vapor-liquid equilibria in the CO/sub 2/-diethylene glycol-H/sub 2/O and CO/sub 2/-triethylene glycol-H/sub 2/O systems at feasible absorption temperatures and pressures

Journal Article · Sun Jan 01 00:00:00 EST 1984 · J. Chem. Eng. Data; (United States)

DOI:https://doi.org/10.1021/je00035a010· OSTI ID:6548245

Takahashi, S; Kobayashi, R; Song, K Y

The water contents of compressed carbon dioxide gas in equilibrium with diethylene glycol (DEG) solutions of 3.5 and 7.0 wt % water, and with triethylene glycol (TEG) solutions of the same concentrations, have been measured at temperatures of 23.89, 37.78, and 48.89 /sup 0/C, and pressures of 2.5166, 2.8955, and 5.2745 MPa. A comparison of the dehydration capabilities of the same glycol-water solution for CO/sub 2/ with that for natural gas (or methane) indicates that the dehydration qualities for the former (CO/sub 2/) exceed those for the latter on an absolute water content basis until a reversal occurs when the CO/sub 2/-rich phase begins to assume dense-fluid characteristics. The solubilities of carbon dioxide in the aqueous glycol solutions of the same concentrations and conditions as the water content measurements, and in the pure glycols, are also reported. The CO/sub 2/ solubility in TEG and DEG solutions has been analyzed thermodynamically by applying the Krichevsky-Kasarnovsky (KK) equation to both the glycol solutions and the pure glycols. The thermodynamically predicted data agreed with the experimental or smoothed experimental data to better than 2% for both the pure and aqueous solvents at temperatures ranging from 23.89 to 48.89 /sup 0/C. In the prediction, the experimental data and thermodynamically consistent low-pressure solubility data were used. Data were extrapolated to essentially zero pressure to deduce the isothermal Henry's law constants.

• Research Organization: Department of Chemical Engineering, Rice University, Houston, Texas
• OSTI ID: 6548245
• Journal Information: J. Chem. Eng. Data; (United States), Vol. 29:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
EQUILIBRIUM
MOISTURE
POLYETHYLENE GLYCOLS
WATER
ABSORPTION
AQUEOUS SOLUTIONS
CALCULATION METHODS
DEHYDRATION
EQUATIONS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
SOLUBILITY
THERMODYNAMICS
ALCOHOLS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
POLYMERS
SOLUTIONS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)