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초임계 이산화탄소와 이온성 액체를 이용한 Propylene Carbonate 합성
김병헌(Byeongheon Kim),장성현(Sunghyeon Jang),민세련(Seryeon Min),김화용(Hwayong Kim) 한국청정기술학회 2011 청정기술 Vol.17 No.1
몇몇 이온성 액체는 이산화탄소를 고정화하여 카보네이트로 전환해주는 반응의 촉매이자 용매로 적합하다. 이온성 액체를 사용함으로써, 합성 공정은 촉매 재활용이 용이하고 휘발성 물질이나 해로운 유기 용매가 불필요하다는 측면에서 보다 환경적이고 간단해질 수 있다. 본 연구에서는 이산화탄소와 이온성 액체를 이용하여 60~80 ℃, 140bar의 온도, 압력 범위에서 프로필렌 옥사이드가 카보네이트로 얼마나 전환되는지 측정하였다. 그 결과, 최적의 조건을 찾았고 그 조건 하에 최대 수율을 얻었다. Some ionic liquids are suitable for catalysts and solvents which are applicable to CO₂ fixation reaction converting CO₂ to carbonate. Using the ionic liquids, the synthesis process will become greener and simpler because of easy catalyst recycling and unnecessary use of volatile and harmful organic solvents. In this work, the synthesis of propylene carbonate from propylene oxide using carbon dioxide and ionic liquids were measured at high pressures up to ~140 bar and at temperatures between 60 ℃ and 80 ℃. As a results, we found the optimum condition and obtained the maximum yield under that condition.
송은석,김화용,김현수,이윤우,Song, Eun-Seok,Kim, Hwa-Yong,Kim, Hyoun-Soo,Lee, Youn-Woo 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.3
Micro- or nano-size particles are required to improve the combustion efficiency and stability in the case of solid explosives and propellants. The micro-structural properties of an energetic material strongly influence the combustion and explosion behavior. However, the traditional size reduction techniques, including milling, are not suitable for production of ultra-fine size particles. As an alternative to the traditional techniques, various re-crystallization processes based on supercritical fluids have recently been proposed. Supercritical fluids are fluids at temperatures and pressures above their critical point. In principle, they do not give problems of solvent contamination as they are completely released from the solute when the decompression occurs. Rapid Expansion Supercritical Solutions(RESS) and Supercritical Anti-Solvent Process(GAS/SAS) are representatives of a nano-size particle formation process of energetic materials using supercritical fluids. In this work, various fine particle formation processes using supercritical fluids are discussed and the results are presented.