Carbon dioxide solubility in reference and vegetable lubricants developed for two stroke engines

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• 作者：Teresa Regueira^a ; Olivia Fandiñ ; o^a ; ^b ; Luis Lugo^a ; ^c ; Enriqueta R. Ló ; pez^a ; Josefa Ferná ; ndez^a ; ^{josefa.fernandez@usc.es}
• 关键词：Carbon dioxide ; Solubility ; Density ; Two stroke engines ; Lubricant ; PC-SAFT
• 刊名：The Journal of Supercritical Fluids
• 出版年：2012
• 期刊代码：60_08968446
• 类别：ce
• 出版时间：August, 2012
• 卷：68
• 期：Complete
• 页码：123-130
• 文件大小：670 K

摘要

The solubilities of carbon dioxide, CO₂, in a reference semi-synthetic oil and in a developed vegetable-sunflower-based oil for two stroke engines have been measured from 283 K to 348 K and pressures up to 9 MPa in a high pressure gas solubility apparatus that works in isochoric conditions. The densities of the developed vegetable oil from 293 K to 353 K and pressures up to 60 MPa were also measured by using a vibrating tube technique. It was found that the solubility of CO₂ in the vegetable oil is higher than in the reference semi-synthetic oil. The solubility of CO₂ in both lubricants decreases when the temperature increases. In addition, we have found that the solubilities of O₂ in these lubricants are between 7 and 10 times lower than those of CO₂. Furthermore, PC-SAFT EoS was employed to model the solubility behavior of CO₂ in both lubricants and the goodness of Carvalho and Coutinho model for prediction of CO₂ solubility in low volatile solvents was checked for these lubricants.