1. Korea Research Institute of Chemical Technology, 100 Jang-dong, Yuseong-gu, Daejeon, 305-343, Korea (E-mail: kwon@krict.re.kr)
2. Department of Chemical Engineering, Chungbuk National University, 12 Gaesin-dong, Heungduk-gu, Cheongju, 361-763, Korea
3. Department of Chemical Engineering, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul, 139-701, Korea
4. Green and Global EnviTech Co., 39-3 Seongbok-dong, Yongin, 449-795, Korea