1. State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum Qingdao Shandong Province 266580 P. R. China
2. Sinopec Research Institute of Safety Engineering Qingdao Shandong Province 266580 P. R. China
3. College of Fisheries Southwest University Chongqing 400700 P. R. China
4. College of Environment and Resources Xiangtan University Xiangtan Hunan Province 411105 P. R. China