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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 $200^{\circ}C$.
초임계유체와 염을 이용한 에탄올농축에 관한 연구 ( 1 ) - CO2 - C2H5OH 계와 CO2 - H2O 계의 고압기액평형 -
조정식,박선근,임종성,김재덕,이윤용,전해수 ( Jeong Shik Cho,Sun Keun Park,Jong Sung Lim,Jae Duck Kim,Youn Yong Lee,Hai Soo Chun ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
High pressure vapor-liquid equilibria for CO₂-C₂H_5OH system were measured at three temperatures of 313.2 K, 323.2 K and 333.2 K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from ca. 5 ㎫ up to near mixture critical point. The critical pressures of the mixtures were about 8.1 ㎫, 9.3 ㎫ and 10.6 ㎫ at the three temperatures, respectively. This result shows that the temperature increases with the critical pressure of the mixture. The high pressure vapor-liquid equilibrium data for CO₂-C₂H_5OH and CO₂-H₂O systems were satisfactorily correlated by applying the Patel-Teja equation of state with the Adachi-Sugie mixing rule.
조정식,이경록,임종성,김재덕,최대기,이윤용,전해수 ( Jeong Shik Cho,Kyong Rok Lee,Jong Sung Lim,Jae Duck Kim,Dae Ki Choi,Youn Yong Lee,Hai Soo Chun ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.4
High pressure vapor-liquid equilibria for CO₂-C₂H_5OH-H₂O and CO₂-C₂H_5OH systems were measured using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated. The conditions to obtain the high ethanol concentration were also investigated. It was possible to concentrate ethanol above the atmospheric ethanol-water azeotropic composition(89.4 ㏖%) when the system pressure was below the critical pressure(P_(c, m) = 0.1203T-29.44) of CO₂-C₂H_5OH system at which vapor-liquid two phases were coexisted at the ethanol high concentration regime. In the relationships between separation factor(ethanol to water) and ethanol solubility in the supercritical fluid phase, it was found that the calculated values by Patel-Teja equation of state had same errors quantitively with the experimental data, but qualitively represented the similar tendencies.