http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임한진,박제일,이재우 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
This work introduces an external loop to a bubble column and presents enhanced gas exchange in the heterogeneous flow regime. Gas exchange experiments under the same amount of gas input were carried out with varying gas velocity to understand the difference of bubble characteristic between the bubble column (BCR) and the bubble column with an external loop (BCR-EL). The observation of rise and descending velocity of bubbles in the BCR-EL showed that the fraction of bubbles passing the downcomer continuously increases with the incremental superficial gas velocity. A gas molecule in the liquid phase is desorbed by another gas molecule, and this gas exchange was assumed to be a phenomenon that a reactant in the liquid phase is converted to a product. To test the validity of the assumed gas exchange as a reaction in the experiments with the BCR-EL, a modeling study was performed using Fisher-Tropsch synthesis. It prevailed that the syngas conversion was higher in the BCR at the homogeneous flow regime, while the BCR-EL at the heterogeneous flow regime (above 0.08m/s) had higher syngas conversion than the BCR due to higher gas recycle to the downcomer.
안호근,손보균,임한진 순천대학교 공업기술연구소 1998 工業技術硏究所論文集 Vol.12 No.-
The reaction conditions were investigated to prepare the hardened oil with suitable properties from Camellia japonica oil by catalytic hydrogenation in batch reactor at atmosphere. The nickel-based catalysts were used, and the hydrogenation activity of the catalyst was measured as iodine value. The commercial Pricat-9920 catalyst was highly active. The hydrogenation rate over Pricat-9920 catalyst was increased with increasing reaction temperature to 180℃, but decreased over 180℃ because the dissolution of hydrogen in the oil was difficult at high temperature. Also, the rate depended on the amounts of catalyst used, the flow rate of hydrogen, and agitation rate, which were deeply related to the diffusion of hydrogen in the pore of the catalyst. The hardened oil with melting point 30~40℃ was obtained at reaction time 4~6hr, reaction temperature 180℃, the amounts of catalysts 0.2%Ni(w/v), and the flow rate of hydrogen 50cc min^(-1). The relationship between iodine value and melting point was linear, so the iodine value could be easily estimated from the melting point.