A model for dynamic extraction using a supercritical fluid

✍ Scribed by Keith D. Bartle; Anthony A. Clifford; Steven B. Hawthorne; John J. Langenfeld; David J. Miller; Robert Robinson

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 699 KB
• Volume: 3
• Category: Article
• ISSN: 0896-8446
• DOI: 10.1016/0896-8446(90)90039-o

✦ Synopsis

An idealized model is suggested for the analysis of the results of extraction in a flow system by a supercritical fluid from a matrix which contains small quantities of extractable materials, such that the extraction is not limited by solubility. The model is that of diffusion out of a homogeneous spherical particle into a medium in which the extracted species is infinitely dilute. The effect of matrix shape and size variation and also solubility limitations on the model, which occur in real systems, are discussed. Predictions of the model are compared with experimental results for systems which are mostly physically unlike the ideal model. However, important features of the behavior of these systems are found to accord with the predictions of the model. The use of the model gives an insight useful for the design of industrial extraction processes and also provides an extrapolation method for obtaining quantitative analytical extraction results relatively quickly.