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HWAHAK KONGHAK,
Vol.28, No.6, 617-623, 1990
Vol.28, No.6, 617-623, 1990
냉동 증류 공정을 이용한 벤젠-시크로헥산계의 고순도 분리
Application of Distillative Freezing Process to Separate Benzene-Cyclohexane System
최소 공비 혼합물을 형성하는 벤젠-시크로헥산계에 냉동 증류 공정을 적용하여 고순도의 벤젠 혹은 시크로헥산을 얻기 위한 조사를 행하였다. 분리 목적물을 벤젠으로 하였을 때 초기농도가 50% 이상이면 고순도 벤젠을 얻을 수 있었고, 분리 목적물을 시크로헥산으로 하였을 때는 초기농도가 90% 이상으로 높아야만 고순도 시크로헥산을 얻을 수 있었다. 불순물의 농도가 증가할수록 결정이 처음 생성될 때의 온도 및 압력은 감소하고, 결정이 처음 생성되는 시간과 dry-out 시간은 증가한다. 또한 결정이 생성될 때까지의 온도 profile을 살펴보면, 액체 표면의 온도와 액체표면 위의 기체 온도는 sample holding tray에 있는 액체 온도보다 더 낮음을 알 수 있다.
A distillative freezing method was applied to get high-pure benzene or cyclohexane from benzene-cy-clohexane mixture, which forms a minimum azeotrope. Over 50% of the initial concentration of benzene in the mix-ture, very high-pure benzene could be separated by this distillative freezing technique. However, when the object pro-duct is cyclohexane, the concentration of cyclohexane in the mixture should be over 90%. The temperature and pres-sure condition for the initial crystal formation are reversely related on the initial concentration of the impure material in feed. The time needed for the crystal formation and dry-out was found to be longer as the concentration of impurity in feed increased. Just before the freezing occurs, temperature profiles revealed that the temperature of the liquid sur-face as well as of the vapor just above the liquid surface were lower than that of the liquid itself on the sample holding tray.
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