Solvents Diffusion in the Low-temperature Process of Silica Gel Supercritical Drying

• Autorzy: Wawrzyniak, P. , Rogacki, G.
• Języki publikacji: EN

Abstrakty

EN

Investigation of the diffusion process taking place during removal of ethanol as a primary solvent from silica alcogel structure with near-critical carbon dioxide as a secondary solvent is presented. The investigation was conducted with two methods following this unsteady-state drying process. In the first method advantage was taken of the phenomenon of partial internal sample destruction during the process of secondary solvent removal. The second method was based on the analysis of the history of outlet concentration of the primary solvent. The experimental techniques are briefly described. The obtained values of effective diffusion coefficients of near-critical carbon dioxide and ethanol in the gel structure are listed. The correlation of the effective diffusion coefficient in the porous structure of silica gel is presented.

Słowa kluczowe

EN

supercritical fluids; diffusion; supercritical drying; supercritical CO2; silica gel; aerogel

• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2000
• Tom: Vol. 48, nr 3
• Strony: 455-462
• Opis fizyczny: 2 rys., 3 tab., bibliogr. 14 poz.

Twórcy

autor

Wawrzyniak, P.

autor

Rogacki, G.

• Faculty of Process and Environmental Engineering, Technical University of Łódź, ul. Wólczańska 213/215, 93-005 Łódź, Poland