Abstract
An experimental set-up is presented with which the diffusion coefficients of naphthalene and caffeine in supercritical carbon dioxide may be determined. The experimental conditions range from 118 to 226 bar and from 35 to 60 °C. The method consists in evaporating the component to be analyzed out of capillaries into supercritical carbon dioxide. The diffusion coefficient can be calculated from the amount of evaporated material during an experimental run. The method is of the pseudo-steady-state type, whereas diffusion coefficients of naphthalene in carbon dioxide given in the literature were obtained with an unsteady-state method. Depending on experimental conditions, the unsteady method yields slightly lower values than the pseudo-steady method. It can be shown that the strongly non-ideal behavior of the gaseous phase restricts the range of application of the unsteady method.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Chemical Engineering and Processing: Process Intensification
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
