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초임계유체와 염을 이용한 에탄올농축에 관한 연구(II)-CO2-C2H5OH-H2O계의 고압기액평형-
A Study on Concentration of Ethanol by Supercritical Fluids and Salts(II)-High Presure Vapor-Liquid Equilibria for CO2-C2H5OH-H2O System-
HWAHAK KONGHAK, August 1991, 29(4), 487-493(7), NONE
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Abstract
기상과 액상 모두를 계속해서 순환시키는 circulation type의 고압상평형장치를 이용하여, CO2-C2H5OH-H2O계에 대한 고압기액상평형실험을 313.2K와 333.2K에서 압력(7.9MPa에서 18.5MPa까지)과 feed 에탄올농도(20wt%에서 70wt%까지; CO2 free basis)를 변화시키면서 수행하였다. CO2-C2H5OH-H2O계의 고압상평형자료를 Adachi와 Sugie의 혼합규칙을 사용한 Patel-Teja식에 적용하여 상관시켜 본 결과 Wilson type의 혼합규칙, 그리고 Group Contribution Equation of State를 사용할 때보다 기액상평형을 잘 예측할 수 있었고, 본 실험자료와 만족할 만한 상관결과를 얻을 수 있었지만, 분리계수나 분배계수의 거동에 대한 예측은 정확하게 표한하지 못하였다.
High pressure vapor-liquid equilibria for CO2-C2H5OH-H2O system were measured at two temper-atures of 313.2K and 333.2K using a circulation type of apparatus in which both bapor and liquid phase were continuously recirculated over a pressure range from 7.9MPa to 18.5MPa. The ethanol concentration in feed varied from 20wt% to 70wt%(CO2 free basis). The Patel-Teja Equation of State with Adachi-Sugie mixing rule predicted the experimental data better than the same equation of state with Wilson type mixing rule and group contribution Equation of State, but could not accurately represent the behavior of the separa-tion factor and distribution coefficient.
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