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Ca - alginate 겔 입자가 첨가된 Airlift 반응기에서 산소의 물질전달에 관한 연구
이근후,도동섭 ( Keun Hoo Lee,Dong Sup Doh ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.4
To investigate the performance of external-loop airlift reactors, the gas holdup and the volumatric mass transfer coefficient were determined experimentally in an airlift reactor with Ca-alginate gel beads. The results show that the overall gas holdup and liquid-phase mass transfer coefficient increased with increasing gas velocity but slightly decreased with increasing particle concentration. The particle size had no clear effect on the variation of gas holdup or oxygen transfer. A mass transfer model was proposed based on Higbie`s penetration theory and Kolmogoroffs isotropic turbulence theory, and it compared fairly with experimental data.
압력요동을 이용한 밀도가 다른 이성분 혼합입자계의 최소유동화속도 측정
장현태,홍성창,도동섭 ( Hyun Tae Jang,Sung Chang Hong,Dong Sup Doh ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.3
The determination method of minimum fluidization velocity from the linear regression of standard deviation of pressure fluctuation according to air velocity was investigated with binary mixture of sand and PMMA in a 0.109 m I.D. fluidized bed. The experiments were performed with change of operating variables such as the fraction of flotsam and particle size, and the measured values of the minimum fluidization velocity were compared with those obtained by the other researchers. The air velocity for this method has limited from well mixed region to freely bubbling region in a fluidized bed. The optimal measuring height of pressure fluctuations seems to be at middle levels on the axis of a bed, where the solid is well mixed.
유동층에서 밀도가 다른 이성분 입자계의 flotsam 의 유출
장현태,차왕석,도동섭 ( Hyun Tae Jang,Wang Seog Cha,Dong Sup Doh ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1
The elutriation characteristics of flotsam for the size distribution of jetsam were investigated in continuous binary system with different density in a fluidized bed. In a fluidized bed of sand and PMMA(poly methyl metacrylate), sand was used as jetsam and PMMA as flotsam. Elutriation rate of flotsam, size distribution of elutriated particles and pressure fluctuations were measured for the size distribution of jetsam and elutriation rate of flotsam depended largely on the size distribution of jetsam. Using these results, it was found that elutriation of fine particles was partially reduced by controlling site distribution of jetsam. Fluidization characteristics were greatly influenced by the size distribution of jetsam and flotsam and these characteristics could be interpreted with standard deviation of pressure fluctuations.
박종수,홍성창,도동섭 ( Jong Soo Park,Sung Chang Hong,Dong Sup Doh ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
The activity of natural manganese dioxide(NMD), electrolytic manganese dioxide(EMD), and metal oxide (MeO/NMD composite catalysts for CO oxidation has been studied as a function of temperature and metal oxide wt% in a differential plug flow reactor system in a temperature range 300-673 K and under atmospheric pressure condition. The MeO/NMD composite catalysts consisted of NMD and metals such as Pt, Pd, Ru, Au, Ag, Cu, Zn, CuCr prepared by wet impregnation method and calcination in air. It was found from the experiment that NMD could effectively be utilized as a catalyst as well as a support for CO oxidation. By the impregnation of metal oxides on NMD, the oxidation activity of CO was increased, and palladium oxide showed the highest increase among other metal oxides. The activation energy of MeO/NMD composite catalysts decreased with the increase of Me0 content and the activation energy of NMD was lower than that of EMD.