미분층 회분반응기에 있어서 고분자수지에 의한 파라클로로페놀의 흡착특성

황상면,정재관 ( Sang Myun Hwang,Jay Gwan G . Chung ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

Monoolefin 의 증기압 예측

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%.

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.

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.

α-Amylase 高生産 菌株에 의한 液化型 α-Amylase의 精製

黃尙勉,金廣 東亞大學校 1991 東亞論叢 Vol.28 No.1

Bacterial α-Amylase of Bacillus natto which is liquefying type from the specificity is one of the in-dustrially important enzymes and utilized in various fields. Bacillus natto IAM 1212 produced about 4,500-5,000 units/ml of liquefying α-amylase in oatmeal culture medium. The α-amylase was purified from cell-free medium by ammonium sulfate precipitation, dialysis of the crude enzyme in Tris-Hcl-Ca buffer of pH 7.5,gel filtration on Bio Gel P-100 and CM-cel-lulose columns, DEAE-Sephadex A-50 column chromatography and the pooled elutes were lyophili-zed. The final purification was accomplished by electrophoresis on the preparative polyacrylamide gels. The α-amylase was purified into nearly a pure state(98.7%). The optimum pH for the enzyme reac-tion was 6.8 at 37˚C. The α-amylase was stable within the range from pH 4.5 to 9.0 ad kept it activity at 37℃. The molecular weight of the purified α-amylase was 34,000. With soluble starch as substrate, the Km value of B.natto α-amylase was 0.83mg/ml. It was known that B.natto α-amylase hydrolyzed maltooligosaccharides to produce more maltose and maltotriose than glucose.

活性炭에 衣한 3,5-디메틸페놀의 吸着平衡

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.

回分式 反應器에서 活性炭에 依한 低濃度有機物의 多成分系 液相吸着平衡

金昺圭,李鏞喆,黃尙勉 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.2

Multicomponent liquid ,phase adsorption of dilute organics(aniline, phenol, p-chlorophenol and p-nitro-phenol) on activated carbon was carried out in a batch reactor. In this study, multicomponent adsorption equilibria were predicted from single and bi-solute data using the ideal adsorbed solution(I.A.S.) theory developed by Myers and Prausnitz while the single-solute equilibria were represented by Freundlich isotherm. The affinity for activated carbon was in the order of para-nitrophenol>para-cholrophenol>phenol> aniline. The Freundlich isotherm was suitable. for single-solute system. But for multicomponent systems, tine isotherms calculated from single-solute data by using I.A.S. theory gave good prediction for the amount adsorbed. For single component systems, the piecewise Freundlich isotherms obtained in several divided equilibrium ranges were used. These isotherms could reduce the deviation appearing in the low concentration ranges.

합성수지 흡착제에 의한 p-Chlorophenol 및 2,4-Dichlorophenol의 액상흡착평형특성에 관한 연구

류정 ( Lyu Jeong ),김현규 ( Kim Hyeon Gyu ),원성호 ( Won Seong Ho ),황상면 ( Hwang Sang Myeon ),김상민 ( Kim Sang Min ),김남기 ( Kim Nam Gi ),이용철 ( Lee Yong Cheol ) 한국공업화학회 2003 공업화학 Vol.14 No.5

Rohm & Haas사에 의해 제조된 합성수지 흡착제, Amberlite XAD-4, XAD-7 및 XAD-1180을 사용하여 수용액상의 파라클로로페놀(p-chlorophenol) 및 2,4-디클로로페놀(2,4-dichlorophenol)의 흡착평형에 대한 특성들이 연구되었다. 흡착평형에 대한 실험결과들은 8가지 흡착등온식에 대한 비선형 회귀분석을 통해 이론적으로 고찰되었다. 실험 자료에 대한 회기분석 결과, 각 합성수지 흡착제에 대한 파라클로로페놀 및 2,4-디클로로페놀의 흡착거동은 BET 등온식, Four-parameter 등온식, Freundlich 등온식, Redlich-Petersen 등온식 및 Slips 등온식을 통해 4.31%의 오차범위 내에서 성공적으로 재현되었으나 Langmuir 등온식 및 Toth 등온식에 의해서는 최대 8.49%의 오차로서 다른 등온식들에 비하여 비교적 높은 오차분포를 갖는 결과를 보였다. Adsorption equilibrium characteristics of p-chlorophenol and 2,4-dichlorophenol on the polymeric synthetic adsorbents, Amberlite XAD-4, XAI-7 and XAD-1180 manufactured by Kohm & Haas Co.. in the aqueous solution were investigated by experimental tests and theoretical analyses. To evaluate theoretically experimental isotherms, eight adsorption equations and regressional methods were used. From the nonlinear regressional analyses adsorption equilibrium behaviors of p-chlorophenol and 2.3-dichlorophenol with polymeric synthetic adsorbents were successfully reproduced by BET isotherm, Four-parameter isotherm. Freundlich isotherm. Loading ratio correlation isotherm, Redlich-Petersen isotherm and Sips isotherm within the deviation of 4.31 %. But the results were not good for Langmuir isotherm and Toth isotherm with the upper deviation of 8.49 %.