Gas−Liquid Equilibrium Data for Sulfur Dioxide + Nitrogen in Diethylene Glycol + Water at 298.15 K and 123.15 kPa

Abstract

Isothermal gas-liquid equilibrium (GLE) data have been measured for the system diethylene glycol (DEG) (1) + water (2) + SO 2 (3) + N 2 (4) at 298.15 K and 123.15 kPa and SO 2 partial pressures in the range of (0.7 to 100) Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE compositions were obtained with relative uncertainties within ( 0.6 % for SO 2 concentration in the liquid phase and ( 3.5 % for SO 2 mole fraction in the gas phase. The measurement showed that the system DEG (1) + water (2) in the mass fraction range of w 1 ) (0.60 to 1.00) decreased the solubility of SO 2 and the system DEG (1) + water (2) in the mass fraction range of w 1 ) (0.00 to 0.60) increased the solubility of SO 2 . Compared with our previous work (Zhang,

Solubility Properties and Absorption Mechanism Investigation of Dilute SO2 in Propylene Glycol Monomethyl Ether + Dimethyl Sulfoxide System

“…However, the density and viscosity of PGME was lower than the other four alcohols, and the absorption capacity was stronger by comparing the values of Henry's constants. According to the literatures, 32,35 the dissolving of SO 2 in alcohol was due to the hydrogen bond and charge-transfer, which demonstrated that the charge-transfer may be easily between the alcohol-containing methoxy group and SO 2 . That is to say, there may be more free of alcohol hydroxyl than other alcohol and derivatives in PGME due to the weekly intermolecular hydrogen bond, which indicated the hydrogen bond is easily between free alcohol hydroxyls in PGME and SO 2 .…”

“…Henry’s constant and density and viscosity of five pure alcohol and alcohol derivatives including EG, DEG, TEG, PEG 300, and PGME are listed in Table . − …”

“…As shown Figure 8a, two absorption bands were observed at nearly 278 and 212 nm, which was due to the n→π* electronic transition of SO 2 at longer wavelength and n→σ* for O atom in PGME or π→π* for SO 2 at shorter wavelength. 31 The 17.7 33 27.5 34 37.1 31 69.0 30 1.56 HLC (10 3 × Pa kg mol −1 ) 24.53 18 19.17 35 11.91 31 8.44 30 8.29 T/K H′ (10 3 ) 32 The position of shorter band moved to longer wavelength when the SO 2 concentrations increase, which result from the decreasing effects of O atoms in PGME or DMSO on S atom in SO 2 make the π→π* electron transition of S atom in SO 2 change easier; 42 also, the increasing conjugated degree in SO 2 and DMSO molecules from intermolecular interaction among PGME, DMSO and SO 2 lead to electronic transition change easier. The bands at nearly 278 nm was due to the n→π* electronic transition of O atom in SO 2 , 32 and the absorption intensity increased with the increasing SO 2 concentrations.…”

Simultaneous Absorption of NOx and SO2 into Water and Acids under High Pressures

“…According to the equilibrium calculation, the S(IV) mainly exists in the forms of HSO 3 − and SO 2 in this pH range, and as the pH value decreases, the proportion of SO 2 increases. 26,34 An increase in the concen-tration of SO 2 in liquid phase reduces the rate of absorption of SO 2 . The absorption of NO x gases into the liquid phase is more complex than the absorption of SO 2 .…”

Solubility Properties and Spectral Investigation of Dilute SO2in a Triethylene Glycol + Water + La3+ System

“…Especially, organic solvents used as absorbents had been identified as an option among the regenerative processes − because regeneration can be carried out by pressure reduction, temperature increase, and use of a carrier gas. Considering all of these, the aqueous ethylene glycol and its similar compound solutions were paid great attention for several years − because of its favorable properties, such as low vapor pressure, high chemical stability, and low melting point. On the other hand, ethylene glycol and its similar compounds present native hydrogen bonding sites for solubility of dilute SO 2 so that the potential desorption characters are presented in regenerative processes of desulfurizing solutions dissolving SO 2 .…”