화학공학소재연구정보센터
Journal of Supercritical Fluids, Vol.10, No.2, 95-103, 1997
Partitioning of carbohydrates in the vapor-liquid-liquid region of the 2-propanol plus water plus carbon dioxide system
Partitioning of five carbohydrates in the vapor-liquid-liquid region of the 2-propanol+water+carbon dioxide system has been investigated experimentally. Phase compositions of all three coexisting phases have been determined at temperatures between 325 and 343 K and pressures between 9 and 13 MPa. The experimental method was checked by measuring vapor-liquid-liquid equilibria (VLLE) in the ternary subsystem 2-propanol+water+carbon dioxide and by comparing the results with the literature. In contrast to recently published experimental data of VLLE in the glucose+acetone+water+carbon dioxide system, adding carbohydrates to the 2-propanol+water+carbon dioxide system causes a significant extension of the VLLE region to lower pressures. With increasing pressure at constant temperature and decreasing temperature at constant pressure, the composition of the middle phase becomes more similar to the composition of the gas phase. Simultaneously, the capacity of the middle phase for carbohydrates decreases and the selectivity for different carbohydrates increases.