Solvent diffusion from spheres in theoretical and real continuous-flow systems is examined. A general model of a continuous-flow solvent removal process is developed. Solvent diffusion from spheres at constant mass-transfer Fourier number Fo$\sb{\rm M}$ in a single continuous-flow stirred tank (CFST) and in a series of CFST is simulated. The degree of solvent removal from the spheres is characterized by a transfer efficiency $\xi$. A series of transfer efficiency curves demonstrate the effect of Fo$\sb{\rm M}$, convective conditions in the system and the spheres residence time distribution on $\xi$. / A pilot-plant process designed to remove ethyl acetate from nitrocellulose spheres in a series of continuous-flow stirred evaporators (CFSE) is studied. Experimental values of $\xi$ are defined from pilot-plant data. The relationship between experimental $\xi$ and Fo$\sb{\rm M}$ is compared to that predicted from transfer efficiency curves. A model of the pilot-plant process is developed. The model incorporates the solution of the mass transport equation with a concentration-dependent diffusivity describing diffusion from a shrinking sphere into the material balance and thermodynamic equations describing the steady-state behavior of a CFSE. The model demonstrates that the transfer efficiency curves can be useful in the design of continuous processes for solvent removal from spheres. / Source: Dissertation Abstracts International, Volume: 51-12, Section: B, page: 6003. / Major Professor: Thomas R. Hanley. / Thesis (Ph.D.)--The Florida State University, 1990.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_78401 |
| Contributors | Liekhus, Kevin James., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 222 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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