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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.
Kim, Il Ryong,Yoon, A-Mi,Lim, Hye Song,Lee, Sunghyeon,Lee, Jung Ro,Choi, Wonkyun National Institute of Ecology 2022 국립생태원회보(PNIE) Vol.3 No.4
DNA markers have been studied and used intensively to identify plant species based on molecular approaches. The genus Medicago belongs to the family Fabaceae and contains 87 species distributed from the Mediterranean to central Asia. Five species of Medicago are known to be distributed in South Korea; however, their morphological characteristics alone cannot distinguish the species. In this study, we analyzed the phylogenetic relationships using collected five species of Medicago from South Korea and 44 taxa nucleotide information from NCBI. The constructed phylogenetic tree using gibberellin 3-oxidase 1 and tRNA<sup>Lys</sup> (UUU) to maturase K gene sequences showed the monophyly of the genus Medicago, with five species each forming a single clade. These results suggest that there are five species of Medicago distributed in South Korea. In addition, we designed polymerase chain reaction primers for species-specific detection of Medicago by comparing the plastid sequences. The accuracy of the designed primer pairs was confirmed for each Medicago species. The findings of this study provide efficient and novel species identification methods for Medicago, which will assist in the identification of wild plants for the management of alien species and living modified organisms.