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충전탑에 관한 연구 : 물질전달계수에 미치는 충전물의 길이의 영향 Effect of Packing material length on Mass Transfer Coefficient
주동표 한국화학공학회 1983 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.21 No.2
工業的인 充塡塔 內의 流動現象을 再現하도록 考案된 小規模의 塔을 使用하여 acetone-ethylformate의 二成分系에 對한 蒸溜實驗을 함으로써 物質傳達係數에 미치는 원주형 充塡物의 길이의 영향을 考察하였다. 實責된 總括物質傳達係數와 充塡物의 길이 사이의 關係가 定量的인 式으로 導出되었으며 物質傳達에 對한 液相의 抵抗은 무시될 정도의 크기였고 物質傳達係數의 값이 充塡物의 길이에 따라 달라져 가는 擧動은 penetration theory를 氣相에 適用함으로써 잘 說明되었다. The effect of packing material length on mass transfer coefficient was studied for distillation experiments of binary system, acetone-ethylformate, in a 26㎜ I.D. laboratory column designed to simulate the flow characteristics of an industrial packed column. Overall mass transfer coefficients were obtained from the experiments on 4 different types of packings and an empirical correlation was proposed between overall coefficient and packing size. The analysis of the experimental result showed that the resistance in liquid phase was negligible and that the variation of individual mass transfer coefficients owing to different packing size could be well explained by an application of penetration theory to gas phase.
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주동표,강태협 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3
물질전달계수의 충전물의 크기에 대한 의존도를 명확히 하기 위한 기초자료를 수집하고 아울러 기왕에 고안한 바 있는 충전탑 내 유동현상 모사장치의 모사성능을 확인하기 위하여 내경 15cm및 높이 135㎝ 인 충전탑을 사용하여 ethylformate-acetone 용액을 전환류 조건하에 증류하였다. 정상상태에서 실측된 액상 조성의 profile은 이론적인 profile과 잘 부합하였으며 이로부터 크기가 10.1, 15.18및 19.40㎜인 ceramic Raschig ring의 인접한 두 혼합점 사이의 거리를 결정하였고 물질전달에 대한 현상론적 연구에 본 모사장치가 유용함을 확인하였다. 혼합점 사이의 거리는 충전물의 크기에 따라 증가하였으며 이들 사이의 정량적인 관계식을 도출하였다. Distillation experiments for binary system ethylformate-acetone were carried out using a 15 ㎝ I.D. and 135 ㎝ height packed column under total reflux condition. Comparing experimental and calculated concentration profiles of liquid phase, distances between two adjacent mixing points of 10.1, 15.18 and 19.40 ㎜ ceramic Raschig rings were determined. The distance was increased according to the increasing dimension of packings and an empirical correlation between them was proposed. The experimental results also convinced of the utility of the model column which simulates the flow phenomena in an industrial packed column, proposed in previous article, for phenomenological study of mass transfer.
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회분식 증류탑을 이용한 아세톤-메탄올-2-프로판올계의 농도분포 및 Murphree 효율
주동표,김정근,김석종 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.4
내경이 10㎝이고 10개의 단으로 구성된 다공판 증류탑을 사용하여 acetone-methanol -2-propanol계의 농도분포를 실측하고 계산치와 비교하였다. 실험은 1기압, 2.8 g㏖/min의 증가속도 및 전환류 조건하에 수행되었다. 삼성분계의 농도 분포는 AIChE, Zuiderweg, Harris 경험식에 의한 이성분계의 전달단위수 사용, 실측한 이성분계의 단효율을 이용한 Maxwell-Stefan식의 수치해 그리고 세 성분에 동일한 단효율을 적용한 5가지 방법으로 추정하였다. 계산치는 실측치와 전반적으로 잘 부합하였으며 특히 AIChE방법이 실측치를 0.32% 오차이내로 잘 모사하였다. 각 성분의 Murphree 효율은 60% 내외로 모든 단에서 거의 동일하였으나 methanol의 경우 탑내농도가 최대가 되는 단에서는 불연속적인 단효율을 나타내었다. Concentration profiles of acetone-methanol-2-propanol system, obtained experimentally using a 10㎝ I.D.-10 stages sieve-plate distillation column, were compared to theoretical profiles. The experiments were performed under 1. atm, total reflux condition and 2.8g㏖/min of vapor bail-up rate. Theoretical profiles were calculated by five different methods : use of binary number of transfer units estimated by AIChE, Zuiderweg and Harris empirical correlations, numerical integration of the Maxwell-Stefan equation and use af constant Murphree efficiency for all components. All theoretical profiles were found to give goad agreement with experimental ones, among which the profiles obtained using AIChE method showed the excellent coincidence within 0.32 % AAD. Being about 60%, the component Murphree efficiencies were similar in most stages but discontinuity in efficiency for methanol was observed for such stage showing the maximum concentration in the column.
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愼鏞稷,朱東豹 亞洲大學校 1983 論文集 Vol.6 No.-
The effect of the distance between two adjacent mixing points on overall mass transfer coefficient was studied for distillation experiments of binary system, acetone-methanol in a 26.5 mm I.D. laboratory column designed to simulate the flow characteristics of an industrial packed distillation column. Five different types of packing elements were used and a quantitative empirical correlation was proposed between overall mass transfer coefficient and the characteristic packing length. The analysis of the present experimental result and of the previous work showed that the general correlation between KG and characteristic packing length would be a hyperbolic function and that if the liquid film is not rippling, as was the present case, the variation of overall mass transfer coefficient could be represented by a linear function of the number of mixing points.
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황선원,김철,주동표 亞州大學校 1990 論文集 Vol.13 No.-
Evaporation experiments of 10-20 wt% LiNO₃aqueous solutions,as simulated liquid radwastes,were undertaken using a laboratory scale thermosyphonic evaporator. Influences of various factors,such as boilup rate of vapor,vapor spacing and number of perforated plates as deentrainment unit,on decontamination factor were investigated and empirical correlations between them were proposed. Decontamination factor was not affected by the concentration of the solution.But being sensitive to the boilup rate of vapor,it appeared to be maximum at splash point of 95 kg/m²hr and was increased by increasing length of vapor spacing and number of perforated plates.
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회분식 충전 증류탑을 이용한 아세톤-메탄올-2-프로판올계의 농도분포 예측
이영상,주동표 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
1-㎝ Pall ring이 150-㎝ 높이로 충전된 내경 10-㎝인 회분식 증류탑을 사용하여 acetone-methanol-2-propanol의 농도분포를 실측하고 이를 이론적 농도분포와 비교하였다. 실험은 1 기압, 전환류조건 및 0.05g㏖/s의 증기속도하에서 수행되었다. 이론적인 농도분포는 Krishna와 Standad가 제안한 행렬모델을 사용하여 계산되었으며 물질전달계수 및 전달단 위높이와 같은 계의 물질전달 특성은 Onda 등, Bravo와 Fair, Billet 및 Bolles와 Fair의 경험식을 사용하여 추정하였다. 계산된 농도분포는 실측치와 대체로 잘 부합하였으며 Bolles와 Fair의 방법이 실측된 농도를 0.021 AAD 이내로 가장 잘 모사함을 알 수 있었다. Concentration profiles of the acetone-methanol-2-propanol system, obtained experimentally using a batch distillation column packed with 1-㎝ Pall rings were compared with theoretical profiles. The LD. and the total packed height of the column were 10-㎝ and 150-㎝ respectively. The experiments were performed under 1 atm, total reflux condition and a vapor boil-up rate of 0.05 g㏖/s. The theoretical concentration profiles were calculated using the matrix model proposed by Krishna and Standart. The mass transfer characteristics of the system, such as mass transfer coefficients and the heights of a transfer unit, were estimated by empirical correlations of Onda et al., Bravo and Fair, Billet, and Bolles and Fair. The calculated profiles were in reasonable agreement with the experimental profiles. It was found that the method of Bolles and Fair gave the best results showing 0.021 AAD between predicted and measured concentrations.
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