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Received February 18, 2010
Accepted March 15, 2010
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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고정화된 이온성 액체 촉매를 이용한 디메틸카보네이트 합성 반응에 대한 속도론적 고찰

A Kinetic Study on the Synthesis of Dimethylcarbonate by Using Immobilized Ionic Liquid Catalyst

부산대학교 화학공학과, 609-735 부산광역시 금정구 장전동 산 30번지 1한국화학연구원, 305-343 대전광역시 유성구 장동 100번지
Department of Chemical Engineering, Pusan National University, San 30, Jangjun-dong, Gumjung-gu, Busan 609-735, Korea 1Korea Research Institute of chemical Technology, 100 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
dwpark@pusan.ac.kr
Korean Chemical Engineering Research, June 2010, 48(3), 332-336(5), NONE Epub 5 July 2010
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Abstract

이미다졸염 형태의 이온성 액체를 구조유도체를 사용하지 않고 솔-젤 법으로 무정형 실리카에 담지시켜 고정화된 이온성 액체 촉매를 제조하였다. 이 촉매를 에틸렌카보네이트와 메탄올과의 에스테르 교환반응에 의한 디메틸카보네이트(DMC)의 합성 반응에 사용한 결과 우수한 촉매 활성을 나타내었다. DMC 합성 반응을 두 단계의 반응식으로 가정한 모델을 설정하여 반응온도와 촉매량을 변화시켜 실험한 결과와 비교한 속도론적 연구에서 실험 결과가 반응모델에 잘 일치하는 것을 알 수 있었다. 이로부터 계산한 유사 활성화 에너지 값은 67.4 kJ/mol 이었다.
Ionic liquid immobilized on mesoporous amorphous silica was prepared from the coupling of 1-(triethoxysilylpropyl)-3-n-alkyl-imidzolium halides with tetraethyl orthosilicate(TEOS) through template-free condensation under strong acidic conditions. The immobilized 1-n-butyl-3-methyl imidazolium bromide ionic liquid on amorphous silica(BMImBr-AS) was proved to be an effective heterogeneous catalyst for the synthesis of dimethyl carbonate(DMC) from transesterification of ethylene carbonate(EC) with methanol. High temperature, high carbon dioxide pressure and long reaction time were favorable for the reactivity of BMImBr-AS. Kinetic studies based on two step reactions revealed that the proposed reaction model fitted well the experimental data. The apparent activation energy was estimated to be 67.4 kJ/mol.

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