SO2 Solubility in Low Molecular Weight Polyethylene Glycol Dimethyl Ether and Correlation using Cubic Equation of State

• Published in: Journal of solution chemistry Vol. 48; no. 7; pp. 1035 - 1045
• Main Authors: Tsuji, Tomoya, Shinozuka, Ryoichi, Tan, Lian See, Hoshina, Taka-aki, Oba, Shigeo, Otake, Katsuto
• Format: Journal Article
• Language: English
• Published: New York Springer US 31.07.2019; Springer Nature B.V
• Subjects: Bridges; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Cubic equations; Dimethyl ether; Equations of state; Geochemistry; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Liquid-vapor equilibrium; Low molecular weights; Mixing rules; Molecular structure; Molecular weight; Oceanography; Physical Chemistry; Polyethylene glycol; Raoults law; Solubility; Sulfur dioxide; Peng–Robinson equation of state; Excess Gibbs energy type mixing rule; Polyethylene glycol dimethyl ether; Sulfur dioxide; Solubility
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-019-00873-3

The solubility of sulfur dioxide (SO 2 ) was measured in polyethelene glycol dimethyl ether (PEGDME) by use of a static type apparatus in the pressure range from 15.2 to 231.2 kPa at 308.18 K. The stated average molecular weight of PEGDME was M w  = 240 g·mol −1 and the molecular structure of the repeating unit is similar to that of dimethyl ether (DME). The bubble point pressure showed a negative deviation from Raoult law. The behavior was expected from consideration of the vapor–liquid equilibrium data of DME + SO 2 , reported by Noles and Zollweg (Fluid Phase Equilib 66:275–289, 1991). The ‘bridge-like structure’ will be microscopically formed between the DME unit and SO 2 , because the two unshared electron pairs of the oxygen atom in DME unit act as an electron donner for some molecules. The Peng–Robinson equation of state was used to correlate the experimental data. Two types of mixing rules were employed. One was a conventional model, and the other was of the excess Gibbs energy type. The latter, Wong–Sandler model combined with Flory–Huggins equation, showed a good reproducibility for the experimental data.