High pressure adsorption and supercritical desorption of aqueous fructose-glucose mixtures
The Journal of Supercritical Fluids, cilt.4, sa.1, ss.60-68, 1991 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 4 Sayı: 1
- Basım Tarihi: 1991
- Doi Numarası: 10.1016/0896-8446(91)90032-2
- Dergi Adı: The Journal of Supercritical Fluids
- Derginin Tarandığı İndeksler: Scopus
- Sayfa Sayıları: ss.60-68
- Anahtar Kelimeler: glucose/fructose fractionation, high pressure adsorption, supercritical desorption
- Boğaziçi Üniversitesi Adresli: Evet
Özet
An adsorption system with the capability of processing a liquid, gas, or supercritical fluid stream was constructed and used to investigate the phase equilibrium and mass transfer behavior of the monosaccharides, fructose, and glucose. The compounds were first adsorbed onto activated carbon from an aqueous solution and then desorbed into a stream of supercritical carbon dioxide containing a small amount of ethanol to enhance solubility. Experiments were conducted at pressures 82.7 and 151.6 bar and temperatures 35, 50, and 65 °C. A mathematical model incorporating local mass transfer resistance and linear equilibrium isotherms was used to describe the movement of solute in the column. This model represents the experimental data well especially for the liquid phase. The ultimate capacity of activated carbon for both fructose and glucose is low. However, the two components are not adsorbed to the same extent. The relative selectivity of fructose over glucose ranges from 2-75 when adsorbing from aqueous solution, and from 2-300 when desorbing into supercritical carbon dioxide. © 1991.