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이보성,유승곤,김혜영,Rhee Bo Sung,Ryu Seung Kon,Kim Hae Yeong Korean Chemical Society 1978 대한화학회지 Vol.22 No.5
化學反應 수반하는 氣體吸着反應器의 設計에 가장 重要한 氣液界面間의 物質傳達係數와 面積을 測定하는데 자주 모델反應이 利用된다. 本硏究는 그 中에서 wetted wall column 에 sulfite-system을 dldydgkdu 特別히 氣液間의 接觸時間이 氣體吸着速道에 미치는 영향을 硏究 檢討하였다. 反應速道가 매우 빠르거나 늦으면 column의 길이에 따라서, 다시 말하면 接觸時間에 따라서 氣體吸着速道에 差異가 크다는 것을 發見했다. 反應速道恒數 $k_2=5.5{\times}10^6m^3/kmol{\cdot}s$ 近處에서는 이 差異가 없어진다. 換言하면 이런 條件下에서 裝置의 hydrodynamics가 氣體吸着速道에 無關해진다. 金屬 column 代身에 graphite column을 使用할 수 있다는 例證을 題示하였다. Model reactions were often applied in the measuring of the mass transfer coefficient and interfacial area between gas and liquid, which are the most important factors in the design of equipment for gas absorption accompanied with chemical reaction this study, wetted wall column was applied to the sulfite-system among the known model reactions. It was found that one could not ignore the effect of contact time on the determination of mass transfer coefficient and interfacial area. When the reaction rate is very high or very low, the differences of absorption rate would be very large in according to the length of column, that is to the contact time. But the effect of contact time was free about the rate constant $k_2=5.5{\times}10^6m^3/kmol{\cdot}s$, that means the rate of gas absorption become independent upon the hydrodynamics of the equipment. It has shown that instead of steel column could be applied the fine grain-graphite column.
초임계 유체 추출에 의한 메조페이스 핏치의 제조 - 초임계 톨루엔에 불용인 석탄 타르 핏치의 특성 -
김철중,유승곤,이보성 ( Cheol Joong Kim,Seung Kon Ryu,Bo Sung Rhee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
Supercritical toluene solubles in isotropic coal tar pitch is extracted at conditions of 330℃, and 50 bar, 70 bar, and 90 bar, respectively. Benzene and quinoline insoluble contents, C/H atomic ratio, and softening point of extraction residues were increased by the extraction of supercritical toluene solubles. β-resin content in extraction residues increased as extraction and the maximum value is reached at about 10 wt% in the experiment conditions. Mesophase formation rate in thermal treatment of extraction residues is in parallel with extraction amount, and it shows the modification of carbonization properties of isotropic coal tar pitch by extraction of solubles with supercritical toluene.
탄소 / 탄소 복합재에 화학증착된 탄화규소의 증착속도 및 막의 특성에 미치는 증착조건의 영향
이영석,유승곤,이보성 ( Young Seak Lee,Seung Kon Ryu,Bo Sung Rhee ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
The effect of different deposition parameters such as deposition time, deposition temperature, total flow rate, mole fraction of reactant(MTS : CH₃SiCl₃) on the deposition rate of SiC on carbon/carbon composites was studied to obtain information on the improvement of oxidation resistance. The deposition process was found out to be activated process with surface reaction as the limiting step up to 950℃, and to be process with mass transport limiting above 950℃. The apparent activation energy obtained were about 28.2 Kcal/mole, 4.5 Kcal/mole, respectively. The film thickness and deposition rate increased linearly with the deposition time. The deposition rate was increased with increasing the mole fraction of CH₃SiCl₃, too. The improvement of the oxidation resistance of carbon/carbon composites can be achieved since oxidation initiation temperature, increased from 450℃ to 820℃ after SiC deposition.
분리기술 열역학 : 활성탄소섬유 카트리지 휠터에 의한 수중 잔류염소의 흡 탈착 거동
송승필(Seung Phill Song),이재광(Jae Kwang Lee),유승곤(Seung Kon Ryu) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.2
Cylindrical Activated Carbon Fiber cartridge filters were prepared to investigate their adsorption/desorption behavior of residual chlorine from 2 ppm aqueous solution. From breakthrough profiles, the amount of purified water was 31.5 ton with Activated Carbon Fiber cartridge filter(Activated Carbon Fiber: 100g) while only 8.4 ton with Activated Carbon Fiber/Activated Carbon cartridge filter(Activated Carbon Fiber; 50 g, Activated Carbon: 50 g) at the breakpoint when the breakpoint was fixed to 0.2 ppm(C/C_0=0.1) residual chlorine. The pressure drop through Activated Carbon Fiber and Activated Carbon Fiber/Activated Carbon cartridge filter were 0.2 ㎏_f/㎠ and 2.3 ㎏_f/㎠, respectively, when 120 ton aqueous solution was passing the cartridges at 10ℓ/min flow rate. The desorption of chlorine from fully used cartridges was performed by reverse washing with hot water at 90 ℃. The desorption efficiency of cartridge was determined by comparison the 2nd adsorption capacity of residual chlorine with the 1st adsorption capacity at breakpoint. The desorption efficiency of Activated Carbon Fiber cartridge was 70.5% while that of Activated Carbon Fiber/Activated Carbon cartridge was 36.9%. The desorption efficiency of cartridge increased with the temperature of washing water and decreased with the amount of Activated Carbon charged in cartridge.