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불화된 γ-Al<sub>2</sub>O<sub>3</sub>상에서 아세틸렌으로부터 1,1-difluoroethane의 합성
이윤우,이경환,임종성,김재덕,이윤용,Lee, Youn-Woo,Lee, Kyong-Hwan,Lim, Jong Sung,Kim, Jae-Duck,Lee, Youn Yong 한국공업화학회 1998 공업화학 Vol.9 No.5
${\gamma}-Al_2O_3$을 불화한 촉매상에서 아세틸렌으로부터 1,1-difluoroethane을 합성하는 실험을 반응물질의 몰비와 접촉시간, 그리고 반응온도를 변화하여 실시하였다. 촉매의 불화는 무수 불화수소로 고온에서 행하였다. 제조된 시료는 XRD에 의한 결정성, 질소 흡착에 의한 세공성, 그리고 피리딘-IR과 암모니아-TPD에 의한 산 특성을 측정하였다. 촉매의 활성은 ${\gamma}-Al_2O_3$가 불화됨에 따라 향상되었고 반응온도 $200^{\circ}C$ 정도에서 원하는 생성물인 1,1-difluoroethane의 분율이 90% 이상이었다. 불화된 ${\gamma}-Al_2O_3$촉매상에서 얻은 중간생성물인 vinylfluoride에 비해 원하는 물질인 1,1-difluoroethane의 비는 불화수소/아세틸렌 몰비가 높고 접촉시간이 큰 경우에서 높았고 반응온도 $210^{\circ}C$에서 최대의 값을 얻었다. The synthesis of 1,1-difluoroethane from acetylene as a function of HF/acetylene ratio, contact time and reaction temperature was studied on a fluorinated ${\gamma}-Al_2O_3$. The fluorination of ${\gamma}-Al_2O_3$ was treated with pure HF gas at high temperature. The crystallinity, the porosity, and the acid properties of the prepared samples were examined using XRD, the nitrogen adsorption, pyridine-IR and ammonia-TPD respectively. The activity was enhanced by further fluorination of alumina. The fraction of 1,1-difluoroethane was obtained above 90% at reaction temperature of about $200^{\circ}C$. The ratio of 1,1-difluoroethane to vinylfluoride over fluorinated ${\gamma}-Al_2O_3$ catalyst was increased with the mole ratio of HF/acetylene and contact time, and was found to be the highest ratio at reaction temperature of $200^{\circ}C$.
초임계유체 정류법에 의한 어유지방산으로부터 EPA 와 DHA 의 분리
김재덕,임종성,이윤우 ( Jae Duck Kim,Jong Sung Lim,Youn Woo Lee ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
It was tested the possibility that EPA and DHA could be separated from fish oil fatty acid ethylester(FAEE) in the supercritical carbon dioxide rectification method. Experiments were carried out in the 1800㎜ tall and temperature gradient packed rectification column at the pressure of 100bar and carbon dioxide flow rate of 52.43NL/min. Experimental results showed that this method was useful to separate the FAEE by the relative volatility of the components. The maximum attainable concentration of EPA, DHA and both of them in product were 41%, 43% and 57% respectively in this rectification column wsing raw fish oil feed.
초임계 이산화탄소 용매하의 요소부가법에 의한 어유지방산으로부터 EPA 와 DHA 의 분리
김재덕,임종성,이윤우 ( Jae Duck Kim,Jong Sung Lim,Youn Woo Lee ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
Separation of EPA and DHA from fish oil fatty acid ethyl ester (FAFE) by urea adductive crystallization method was carried out in the supercritical carbon dioxide (SC CO₂) as a solvent. Our results showed that SC CO₂is a good candidate as a solvent in the adductive crystallization to separate FAFF by the number of unsaturated bohds. Compared to the separation process using methanol, SC CO₂yielded better performance in the overall selectivity of EPA and DHA. The effect of process variables on separation of EPA and DHA was discussed in detailed. A hybrid technology of SC CO₂fractionation and urea adductive crystallization with SC CO₂was conformed as a viable process to separate and concentrate EPA and DHA from fish oil.
공업화학, 촉매/반응공학 : 아임계 및 초임계수하의 p-Xylene 의 무촉매 부분 산화반응에서 반응조건이 Terephthalic acid 의 선택성에 미치는 영향
김영래 ( Young Lae Kim ),김재덕 ( Jae Duck Kim ),임종성 ( Jong Sung Lim ),이윤우 ( Youn Woo Lee ),이성철 ( Sung Chul Yi ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1
The possibility of manufacturing the terephthalic acid(TPA) by partial oxidation of p-xylene without a catalyst in subcritical and supercritical water medium was investigated experimentally. The effects of reaction condition such as reaction temperature, pressure and hydrogen peroxide feed ratio on the conversion of p-xylene and the selectivity of TPA produced were investigated in batch reactor and new oxidation reaction pathway of p-xylene was proposed. Conversion of p-xylene was about 89.0% in subcritical condition and increased with the temperature increasing, over 99.0% in supercritical condition after 20 minutes from the start of reaction. The selectivity of TPA in subcritical conditions was higher than in supercritical conditions and the maximum value was 29.0% at 300 ℃, 220 bar, 50% H_2O_2 feed ratio. The pressure effect on TPA selectivity was higher at subcritical water condition than at the supercritical condition.