The solubilities of carbon dioxide, hydrogen sulphide and propane in some normal alkane solvents—II: Correlation of Data at 25°C in Terms of Solubility Parameters and Regular Solution Theory

✍ Scribed by M.B. King; K. Kassim; H. Al-Najjar

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 577 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)80060-2

✦ Synopsis

Solublhty data at 25°C for CO+, H,S and C,Ha and also for C,H, m the n-alkanes C,H,, to C&I, were consldered These were correlated usmg two actlvrty coefficient equations of the "regular solution" type, the first being the one including a "Flory-Huggins" entropy term (evaluated from molar volumes) which 1s normally used The second equation was slmllar except that the "Flory-Huggms" term was evaluated from molecular geometry instead of from molar volumes and, also a higher order approximation was used for this term This equation, m its composltlon-dependent form IS a variant on existing ones It was used m conlunctlon with an analytic expression for the number of segments r in a n-alkane chain as a function of the number of carbon atoms The correlation procedures were based on attrlbutmg a constant value to the mteractlon parameter, I,,, for a given solute dissolved m the entue range of alkane solvents In this way It was found possible to collate the data for CO, virtually wthm the experlmental error usmg either of the above equations together with experimentally determmed solute and solvent solublllty parameters The fit obtamed for the remauung solutes was not so close though the modltied regular solution equation then gave noticeably better results Finally, by adjusting the solute solubdlty parameters, it was found possible to collate the data for all the solutes within the experimental error m this way lTWRODUCTlON