PHASE-EQUILIBRIA FOR CARBON-DIOXIDE ETHANOL-WATER SYSTEM AT ELEVATED PRESSURES
PHASE-EQUILIBRIA FOR CARBON-DIOXIDE ETHANOL-WATER SYSTEM AT ELEVATED PRESSURES
复制标题
DOI：
10.1016/0896-8446(94)90009-4
复制
发表时间：
1994-12-01
影响因子：
3.9
通讯作者：
CHUN, HS
中科院分区：
文献类型：
--
作者：
LIM, JS;LEE, YY;CHUN, HS
对于与使用超临界CO2从发酵液中浓缩乙醇溶液相关的应用，在313.2、323.2、333.2和343.2 K下在高达18.5 MPa的压力下在宽范围的乙醇浓度下测量CO2-C2 H5 OH和CO2-C2 H5 OH-H2O系统的汽液平衡。采用汽液两相连续循环的循环式平衡装置进行测定。当三元体系CO2-C2 H5 OH-H2O中的压力低于二元体系CO2-C2 H5 OH的临界压力时，使用CO2，可以将含水乙醇浓缩到高于常压共沸组成（89.4mol%）。将相平衡的实验测量结果与使用四种类型的混合规则中的每一种的Patel-Teja状态方程预测的结果进行比较：常规，Wilson，Yu等人，还有阿达奇和苏吉除了传统的混合规则外，对二元体系的相平衡也得到了很好的估计。同时发现，虽然Patel-Teja状态方程对三元体系的浓度估算结果不理想，但采用阿达奇和Sugie混合规则能更好地预测三元体系的相行为。
For applications related to the use of supercritical CO2 to concentrate ethanol solutions from a fermentation broth, vapor-liquid equilibria for the CO2-C2H5OH and the CO2-C2H5OH-H2O system were measured at 313.2, 323.2, 333.2, and 343.2 K at pressures up to 18.5 MPa over a wide range of ethanol concentration. A circulation type of equilibrium apparatus in which both vapor and liquid phases were continuously recirculated was adopted for measurements. Using CO2, aqueous ethanol can be concentrated above atmospheric azeotropic composition (89.4 mol %) when the pressure in the ternary system CO2-C2H5OH-H2O is below the critical pressure of the binary system CO2-C2H5OH. The experimental measurements for the phase equilibria were compared with the results predicted by Patel-Teja equation of state using each one of the four types of mixing rules: conventional, Wilson, Yu et al., and Adachi and Sugie. Good estimation was obtained for the phase equilibria of the binary systems except for the conventional mixing rule. It was also found that the phase behavior of the ternary system can be better predicted by the Patel-Teja equation of state with the Adachi and Sugie mixing rule than with the three other mixing rules, though the concentration is not estimated satisfactorily.