Phase-behavior of alkyl ketene dimmer (AKD) in supercritical carbon dioxide: The implications of using different solubility measurement methods
2012 (English)In: Journal of Supercritical Fluids, ISSN 0896-8446, Vol. 61, 25-33 p.Article in journal (Refereed) Published
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 degrees C and pressures from 10 to 30 MPa. A significant increase in solubility was observed in the region above 50 degrees 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. H-1 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.
Place, publisher, year, edition, pages
2012. Vol. 61, 25-33 p.
Solubility, Supercritical carbon dioxide, Wax, Alkyl ketene dimer
IdentifiersURN: urn:nbn:se:uu:diva-172165DOI: 10.1016/j.supflu.2011.09.010ISI: 000301015200004OAI: oai:DiVA.org:uu-172165DiVA: diva2:513710