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초임계 상태의 이산화탄소에 의한 페놀과 그 염화물의 용해도 측정
배효광,전정호 ( Hyo Kwang Bae,Jeong Ho Jeon ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
The solubilities of phenol, p-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol in carbon dioxide were measured under the supercritical conditions of pressure range between 8 and 20 ㎫, and 309.2 K, 318.2 K and 333.2 K, using the flow-type apparatus that was newly manufactured. The solubilities were good agreement with the equilibrium data predicted by using Peng-Robinson equation of state, although temperature of system is close to/or a little higher than the melting point of solid. The parameters of a and b in the equation of state were obtained by regression method utilizing the experimental solubilities and they are little affected by the temperature for a binary system. The enhancement factor obtained from the solubility data was linearly related in semi-log plot, and the relations were affected by the temperature of a binary system.
초임계 유체에 의한 페윤활유의 재활용에 관한 기초 연구
배효광,서정태 ( Hyo Kwang Bae,Jeong Tae So ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1
The regeneration of waste lubricating oil was carried out under the conditions of temperatures 383 K, 423 K and 473 K, and 8.0-16 ㎫ pressure range by using propane solvent at supercritical condition. The contents of impurities and heavy metals contaminated in the refined oils that were regenerated at all the experimental conditions were fully satisfied the environmental criteria when used as fuel. The extraction yield was up to about 85%, according to the increase of pressure, but the optimum condition was likely to be that of 423 K and 10 ㎫, considering the physical properties such as color and impurity contents in the refined oil.
배효광,허병기 ( Hyo Kwang Bae,Beung Ki Her ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
The solubilities of disperse dyes in carbon dioxide were measured under the supercritical conditions of pressure range between 15 and 29 ㎫ and 333.2 K, 363.2 K, 393.2 K and 423.2 K using a supercritical extraction apparatus. The mole fractions of dyestuffs in carbon dioxide were 10^6-10^9. The solubility effect on temperature and pressure was discussed. The solubilities increased with rising temperature at constant density, because the sublimation pressure of dyestuff increased with temperature. The enhancement factors assuming the sublimation pressures of dyes were fixed to he 1Pa were correlated linearly with the density of carbon dioxide.
배효광,이준용 ( Hyo Kwang Bae,Jun Yong Lee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.4
The experimental study for reuse of waste lubricating oil was carried out, by using flow-type apparatus newly manufactured for supercritical propane extraction. The weight ratio of solvent and waste lube nil was changed between 1.5 and 19. The recovered lube oil extracted under the supercritical condition of 150℃ and 10㎫ was ca. 85%, of the waste oil, that was good agreement with the results of our previous work. The physical properties and contents of impurities in the recover lube oil were measured according to ASTM and the relation between weight ratio of solvent and removal of impurities was discussed.
단신 / Riedel 의 증기압식에 의한 편심계수의 상관
배효광(Hyo Kwang Bae) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
The vapor pressure equation proposed by Riedel is used for the estimation of acentric factor, which is widely used in the correlation of thermodynamic and transport properties and in the equation of state. A correlation of the fourth parameter D in Riedel vapor pressure equation to Riedel parameter at critical temperature α_c is empirically developed. The new method requires only the vapor pressure at normal boiling temperature and critical temperature and pressure of each component. The average absolute deviation between the calculated and the observed acentric factor in literature is 2.1% for 409 compounds, This results compare with those of another methods, Edmister(3.6%), Lee-Kesler method(3.6%), and Chen et al. method(2.3%).
배효광 ( Hyo Kwang Bae ) 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.6
Much effort has recently been put on the study of measurement technique and prediction for the vapor-liquid equilibrium at high pressure because of their increasing importance in the enhanced oil recovery (EOR) by CO₂ gas, liquefaction of solid fuels, and extraction of less volitile substance with supercritical gases. This review presents the recent trend of vapor-liquid equilibrium studies at high pressure, discussion on the difficulties associated with these studies, and a survey of progress in the development of new or modified equation of state and prediction methods appicable to phase equilibria of EOR and supercritical gas extraction.
배효광(Hyo Kwang Bae),서정태(Jung Tae Seo) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
The mutual solubility of carbon dioxide and lubricating oil was measured at the temperatures 298.15 K, 308.15 K, 328.15 K, 343.15 K and the pressure range between 2 ㎫ and 20 ㎫, by using the flow-type apparatus for high pressure gas-liquid equilibrium. Supposing the lube oil fraction as a pure psudocomponent, the average molecular weight, critical properties and acentric factor were estimated by Kesler-Lee correlation. The solubilities of carbon dioxide in liquid phase and lube oil in gas phase were predicted by using an equation of state. The average absolute deviations between observed and calculated concentration of each phase were not great.