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초임계 이산화탄소를 이용한 일일초로부터 vindoline 과 catharanthine 의 추출속도
송규민,홍원희,이흔,곽상수,유장열 ( Kyu Min Song,Won Hi Hong,Huen Lee,Sang Soo Kwak,Jang Ryul Liu ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.3
Vindoline and catharanthine were extracted from the pretreated leaves of Catharanthus roseus using supercritical carbon dioxide and their mass transfer coefficients were determined in various conditions of temperature and pressure. Extraction yields of vindoline and catharanthine were compared with the reduced density of supercritical carbon dioxide and the relational parameters were calculated in each given temperature. Defining the mass transfer coefficient of vindoline and catharanthine between solid phase and fluid phase, the mass transfer was studied by steady state analysis. Sherwood number obtained by this method was expressed as a function of Reynolds and Schmidt number.
한재성,송규민,홍원희,장호남 ( Jae Sung Han,Kyu Min Song,Won Hi Hong,Ho Nam Chang ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
The flow pattern in a rotating packed disk reactor was studied by using dye tracers in 50% glycerin solution. Based on the observation it was postulated that the fluid can be divided into two regions of mixing; one region where fluid rotates in the same direction of the disk, and the other region where fluid rotates in the opposite direction. The fluids in the two regions were highly turbulent and perfectly mixed. A three-parameter multi-step model was adopted, with each step composed of two perfect mixing regions and a bypassing, to illustrate the residence time distribution of fluid in the reactor. The parameters of the model were obtained from the experimental data, using Marquardt`s optimization algorithm. The model was in good agreement with the experimental data. Correlations were proposed for the analysis of residence time distribution.
투과증발공정에서 투과액의 상전이에 의한 온도강하가 물질전달에 미치는 영향
송규민,이철행,홍원희,박병건,장호남 ( Kyu Min Song,Chul Haeng Lee,Won Hi Hong,Byung Geon Park,Ho Nam Chang ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
The effect of the temperature drop by phase transition on mass transfer in pervaporation module and the phenomenon of the apparent concentration polarization by the change of flow rate were discussed in term of the heat supply ratio defined in this study. The heat supply ratio indicates the relative amount of heat supplied from retentate for phase transition of permeate. With experiments, the mass transfer was decreased with increasing of the feed temperature and the heat supply ratio because of higher temperature drop. As the feed flow rate was decreased, the temperature drop was increased and the mass transfer was decreased. This phenomenon has a similarity of the concentration polarization in the case of other membrane processes without phase transition. It was shown that the effects of the temperature drop on mass transfer were nat negligible from the comparison of the proposed formular for the concentration polarization.
정인식,송규민,홍원희,장호남 ( In Sick Chung,Kyu Min Song,Won Hi Hong,Ho Nam Chang ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.5
Ethanol dehydration of azeotropic mixture was performed by using diffusion distillation apparatus consisting of a wetted-wall column with two concentric tubes. Ethanol-water mixtures evaporated below the boiling point was separated during the diffusion through the gap filled with an inert gas. As the temperature difference between evaporation part and condensation part was increased, the total flux increased but the selectivity decreased. The effect of the annular width on the selectivity was not significant but the total flux was decreased with decreases in the annular width. Inert gas has an effect on the diffusivity of evaporated gas components. The total flux in case of helium as inert gas was larger than that in case of air but the selectivity in case of using helium was lower.
김성철,송규민,홍원희,이흔,양승만 ( Sung Chul Kim,Kyu Min Song,Won Hi Hong,Huen Lee,Seung Man Yang ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.6
The effects of liquid entrainment and weeping on the plate efficiencies of the multistage column are theoretically analysed. The presented model assumes the existence of concentration profile both in the liquid flowing direction and in the radial direction. Sample results are shown graphically and compared with the experimental data reported in the literatures.
수치모사에 의한 원심식 분자 증류장치에서의 열 및 물질전달에 미치는 Prandtl 수의 영향
박동명,송규민,홍원희,양승만,산전기수 ( Dong Myung Park,Kyu Min Song,Won Hi Hong,Seung Man Yang,Ikuho Yamada ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
The rigorous mathematical model of heat and mass transfer on the rotating surface in the centrifugal molecular distillation is developed. Tangential velocity component to the conical surface is independent of z-direction but not negligible. The solutions of fluid temperature profile and mass transfer rates of distillate are obtained using Finite Difference Method. The heat conduction from heating plate to film decreased as Prandtl number increased. These solutions show good agreement with the approximate solution for liquids near Pr≒10. However these solutions differ from the approximate solutions at Pr>100 as heating rate increases. The solutions in the limited case that the heating rate is equal to the latent heat of vaporization agree with those of Greenberg.
CuCl 착화반응을 이용한 파라핀에서부터의 아세틸렌 분리
김동민,장호남,송규민,홍원희 ( Dong Min Kim,Ho Nam Chang,Kyu Min Song,Won Hi Hong ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
The separation of acetylene from paraffins using CuCl complex reaction was investigated. The amount of complexed acetylene increased at lower temperature, in better mixing conditions, with the higher amounts of CuCl present in the slurry and at higher dissociation temperatures, but decreased at higher complexing temperature and repeated use of slurry. If CuCl is not present or the temperature is not suitable for the complexing reaction, only absorption or physical adsorption of gases can occur.