Optimization study of sub/supercritical water liquefication of lignite: Fast liquefaction for high bio-oil yield |
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| Affiliation: | 1. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, 7089 Weixing Road, Changchun, 130022, PR China;2. Department of Chemistry and Chemical Biology and Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ, 08854, USA;1. College of Chemistry, Xiangtan University, Xiangtan, 411105, Hunan Province, PR China;2. Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, And Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, 411105, Hunan Province, PR China;3. College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, Hunan Province, PR China;1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Zhejiang Energy Group R&D, Hangzhou, 310007, China;3. Center of Excellence in Environmental Catalysis and Adsorption, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thailand;1. CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, PR China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi''an, Shaanxi 710075, China;3. Department of Environmental Sciences, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, 46000, Pakistan |
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| Abstract: | Sub/supercritical water liquefication (SCWL) is a water-based thermochemical technology as well as an environmentally friendly treatment by converting wet feedstock into bioenergy. In the present study, a systematic investigation of SCWL of lignite was carried out covering a temperature range between 320 and 440 °C when residence time increased from 5 min to 40 min. The highest bio-oil oil yield of 34.3% with solid residue of 52.7% was obtained at 440 °C for 5 min. Phenol derivatives, carboxylic acids, long chain hydrocarbons, ketones, and naphthalene were the main bio-oil composition through FTIR and GC-MS analysis. Gas yields and their exact compositions were also determined and CO2 was the dominate gas product but the percentage of CH4 became significant at severe SCWL conditions. A conclusion was drawn that fast liquefaction (e.g. 5 min) at relative higher temperature (e.g. 400 °C) which avoid excessive gasification and repolymerization reactions was an optimization strategy for high yield bio-oil production from SCWL of lignite. |
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| Keywords: | Sub/supercritical water Fast liquefaction Bio-oil Lignite |
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