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HWAHAK KONGHAK,
Vol.35, No.2, 192-198, 1997
Vol.35, No.2, 192-198, 1997
초임계 CO2-C2H5OH-H2O계의 상평형 연구
Phase Equilibrium Study of Supercritical CO2-C2H5OH-H2O System
초임계 유체상과 액상이 순환되는 상평형 실험장치를 사용하여 50℃, 101-178bar 사이의 초임계 CO2-C2H5OH-H2O계의 평형조성을 측정하고 이 결과를 Peng-Robinson의 상태방정식을 이용하여 해석하였다. PR-EOS를 본 3성분계에 적용함에 있어 adjustable parameter ε(εⅠ, εⅡ, εⅢ)을 사용하는 새로운 혼합규칙을 제안하고 이때의 계산결과를 binary interaction parameter kij를 사용하는 전통적 방법과 비교하였다. Parameter ε을 사용하여 추정된 평형 조성은 실측치와 4% 이내의 오차로 부합되었으며 특히 초임계 유체상의 조성은 실측치와 1.5% 이내로 잘 일치하였다. 실험적 사실에 기초하여 온도 범위 40-60℃, 압력 범위 101-185bar 사이에 적용될 수 있는 ε과 온도 사이의 정량적인 관계식을 제시하였다.
Using a circulation-type apparatus, equilibrium compositions of a supercritical CO2-C2H5OH-H2O System under the conditions of 50℃ and 101-178 bar were measured experimentally and were compared with the values predicted by the Peng-Robinson equation-of-state. In applying PR-EOS, a new mixing rule including a new adjustable parameter ε(εⅠ, εⅡ, εⅢ) was proposed and the equilibrium compositions predicted using the ε were compared with the results based on the conventional mixing rule. Equilibrium, compositions computed by using the parameter ε agreed with the experimental data within 4% AAD. It was found that the prediction by the newly developed procedure was quite satisfactory for the supercritical fluid phase, resulting in 1.5% AAD. From the experimental observations, an empirical correlation of ε with temperature was proposed which may be applicable for the operating conditions between 40-60℃ and 101-185 bar.
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