Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
231029 | The Journal of Supercritical Fluids | 2012 | 9 Pages |
In this work, three different methods were used to determine the phase behavior of alkyl ketene dimer (AKD) in supercritical carbon dioxide (SC-CO2). Rough values for the total solubility of AKD in SC-CO2 were obtained. The solubility ranges from 1 to 14 mg AKD/g CO2 at temperatures from 40 to 80 °C and pressures from 10 to 30 MPa. A significant increase in solubility was observed in the region above 50 °C and 20 MPa. A region of improved solubility was found, without the presence of a cross-over pressure point.The fact that different solubility methods gave different results was discussed and the importance of data interpretation was highlighted. 1H NMR and MALDI-TOF MS analyses were utilized to chemically characterize the AKD wax. Its special behavior and the influence of data interpretation on the design of a RESS process were discussed.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Solubility values of alkyl ketene dimmer in supercritical carbon dioxide are obtained. ► Three different solubility measurement methods are used and compared. ► Data interpretation has critical implications on the design of further high-pressure processes.