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微分層回分反應器에서 高分子樹脂에 依한 클로로페놀類의 吸着擧動에 關한 硏究 : Ⅱ. 吸着速度論 Ⅱ. Adsorption Kinetics
黃尙勉,鄭在灌 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1
In this study, p-chlorophenol and 2,4-dichlorophenol adsorption kinetics in a differential column batch reactor was investigated using a nonionic polymeric resin, XAD-4, which has macroreticular structure and was manufactured by Rohm and Haas Co.. The results obtained from the tests were as follows: Adsorption kinetic tests employing XAD-4 resin in a diffenential column batch reactor were carried out at the flow rate greater than 841.1 ml/min for p-chlorophenol and 1021.5 ml/min for 2,4-dichlorophenol where the film diffusion resistance was minimized and homogeneous surface diffusion model was applied to the resulting experimental data in order to predict adsorbate behavior. Adsorption behavior for p-chlorophenol and 2,4-dichlorophenol was successfully predicted with the deviation less than 2% and 4% for the respective overall experimental data.
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微分層反應器에서 高分子樹脂에 依한 클로로페놀類의 吸着擧動에 關한 硏究 : Ⅰ. 吸着平衡 Ⅰ. Adsorption Equilibrium
黃尙勉,鄭在灌 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1
In this study, p-chlorophenol and 2,4-dichlorophenol adsorption equilibrium behavior from aqueous solutions was investigated using nonionic polymeric resins, XAD-4, XAD--7, and XAD-1180, which have macroreticular structure and were manufactured by Rohm and Haas Co.. The batch equilibrium tests for p-chlorophenol and 2,4-dichlorophenol using the polymeric resins were performed at 22 ℃ and pH 6.5. The results obtained from the tests were as follows : 1. As the best fit of experimental data for p-chlorophenol, Redlich-Petersen adsorption isotherm for XAD-4 resin, Freundlich isotherm and Redlich-Petersen isotherm for XAD-7, and Freundlich isotherm for XAD-1180 were determined with the deviation of 2.86%, 2.06%, and 3.10% for the respective experimental values. 2. For 2,4-dichlorophenol, as the best fit of experimental values Freundlich adsorption isotherm for XAD-4 resin, Redlich-Petersen isotherm for XAD-7, and Freundlich isotherm for XAD-1180 were determined with the deviation of 3.31%, 3.03%, and 4.14% for the given experimental data, respectively.
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安旼燁,黃尙勉,鄭在灌 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1
In this study in order to remove 3,5-dimethylphenol from aqueous solutions the granular activated carbon, SLS-100, manufactured by Sam-Chul-Li Company, was used as an adsorbent. The adsorption time to reach equilibrium and the effects of activated carbon size, temperature, and pH were analyzed. Finally adsorption isotherms for various sizes of activated carbon were examined at optimum pH. 1. The adsorption capacity of activated carbon in the size range (-20∼50/60 mesh) of this study was highest at 50/60 mesh size and the equilibriium time for the adsorption of 3,5-dimethylphenol was found 10 days. 2. The maximum adsorption took place at the lowest temperature of 5℃ in the temperature range (5∼50℃) of this investigation. 3. The activated carbon (35/40 mesh) showed its maximum adsorption capacity at pH 7. 4. The Langmuir isotherm as well as the Freundlich isotherm agreed well with the experimental data in the concentration range (1∼80 mg/l) of this experiment, although the Langmuir isotherm showed a little better agreement than Freundlich isotherm.
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황상면,정재관 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.6
공정설계에 필요한 증기압에 관한 자료를 정확하게 예측하는 것은 중요한 일이다. 따라서 본 연구에서는 증기압과 온도와의 관계를 정확도와 이용의 편리성의 측면에서 고려하였으며, 결과는 다음과 같다. 문헌에 발표된 monoolefin의 증기압 실험적 측정치를 이용하여 다음과 같은 환산된 형태의 증기압식에서 상수 A, B, C, D와 지수를 결정하기 위한 실험치를 분석하였다. ln P_r=A+B/T_r+C ln T_r+DT_r^n 위 식의 오차분석 결과 27개의 monoolefin 각 물질에 대한 지수 n, 상수 A, B, C, D 그리고 평균편차를 구하였으며, 모든 monoolefin에 대한 평균편차는 0.41%로 나타났다. 모든 monoolefin에 대하여 최소의 평균편차를 나타내는 지수 n이 4.00일 때 각 물질에 대한 상수들이 결정되었다. 또한 상수 A, B 그리고 C에 대하여 상수 D의 상호관계를 구한 후 단지 상수 D만으로 표현된 다음과 같은 증기압식을 얻었다. ln P_r = (0.90008 in T_r) D³-(4.95122 ln T_r)D²+[T_r⁴-9.5596 ln T_r-(16/T_r)+15]D + 2.26464 ln T_r 여기서 상수 D는 위 식을 정상 끓는 점에 적용하여 구하였다. 다만 정상 끓는 점과 임게압력 그리고 임계온도를 위 식에 적용하여 27개의 monoolefin에 있어서 1110개의 증기압 실험치에 대한 전체평균편차를 구한 결과 삼중점과 임계점 사이의 범위에서 1.23%로 나타났다. 그러나 위 식의 적용범위를 100㎜Hg<P<P_c로 제한할 때 전체평균편차는 0.84%이었다. It is important to predict vapor pressures correctly for process design. In this study the relationships between vapor pressure and temperature have been considered in terms of accuracy and convenience, resulting in the followings. Experimental vapor pressure data reported in the literature for monoolefin have been rigorously analyzed and used to determine the constants A,B,C,D and exponent of the following equation in the reduced form: ln P_r=A+B/T_r+C ln T_r+D T_r^n The error analysis for the above equation has provided us with exponent n, average deviation, four constants for each material and an overall average deviation of 0.41% for twenty-seven materials. When exponent n becomes 4 for the best fit, four constants for each material have been determined. The constants A,B and C are correlated with the constant D and the following vapor pressure equation has been obtained, containing only a single constant D: ln P_r = (0.90008 in T_r) D³-(4.95122 ln T_r)D² +[T_r⁴-9.5596 ln T_r-(16/T_r)+15]D + 2.26464 ln T_r where the constant D is found by applying this latter equation at normal boiling point. When only the normal boiling point and the critical temperature and pressure are required, by employing the latter equation, an overall average deviation of 1.23% is obtained for 1110 vapor pressure data points comprising 27 materials for monoolefin, between the triple point and critical point. But for 100 ㎜Hg< P<P_c this latter equation was found to reproduce experimental vapor pressures with an overall average deviation of 0.84%.
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