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Investigation on the esterification by using supercritical ethanol for bio-oil upgrading
Zhang, Qing1,2; Xu, Ying1; Li, Yuping1; Wang, Tiejun1; Zhang, Qi1; Ma, Longlong1; He, Minghong1; Li, Kai1
2015-12-15
Source PublicationAPPLIED ENERGY
Volume160
AbstractCurrent global resources of fossil fuels are gradually depleting and the energy crisis induces increasing concerns on the research of new effective substitution of these fossil fuels by renewable energy, especially bio-fuels from biomass such as bio-oils. However, bio-oils, generally originated from the pyrolysis of biomass, contain a great deal of carboxylic acids such as acetic acid and these acids can easily decrease the stability and the quality of oil. Meanwhile, these acids are highly corrosive to reaction equipments. Bio-oil could be upgraded before its utilization in the feedstocks of fuels and chemicals. In this work, the removing of these carboxylic acids was investigated by esterification in supercritical ethanol. The effects of reaction temperature, the ratio of ethanol to bio-oil, and reaction time on the conversion of acids were studied as well as the addition of external acid such as H2SO4, H3PO4 or zeolite. The results showed that carboxylic acids in crude bio-oil easily esterified with ethanol in the supercritical system. More ethyl acetate was formed at higher volume ratio of ethanol to bio-oil and 100% of the selectivity was achieved at the volume ratio of 5:1 after 2 h reaction, whereas more side reactions were present in lower or higher ratio of ethanol to bio-oil. The addition of external acid decreased distinctly the formation of esters, indicating that these carboxylic acids could be effectively removed under the acidic system arising from the internal ionization of ethanol. These would be very useful in the upgrading of bio-oil into high quality fuels in the future biorefinery. (C) 2015 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordBio-oil Upgrading Esterification Supercritical Ethanol
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.apenergy.2014.12.063
WOS Subject ExtendedEnergy & Fuels ; Engineering
WOS KeywordSOLID ACID CATALYST ; NI-BASED CATALYST ; FAST PYROLYSIS ; LIGNOCELLULOSIC BIOMASS ; PD/C CATALYST ; BED REACTOR ; RICE HUSK ; WOOD ; HYDRODEOXYGENATION ; HYDROTREATMENT
Indexed BySCI
Language英语
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000364890700058
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10906
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangzhou 510640, Peoples R China
2.Anhui Normal Univ, Coll Chem & Mat Sci, Wuhu 24100, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Qing,Xu, Ying,Li, Yuping,et al. Investigation on the esterification by using supercritical ethanol for bio-oil upgrading[J]. APPLIED ENERGY,2015,160.
APA Zhang, Qing.,Xu, Ying.,Li, Yuping.,Wang, Tiejun.,Zhang, Qi.,...&Li, Kai.(2015).Investigation on the esterification by using supercritical ethanol for bio-oil upgrading.APPLIED ENERGY,160.
MLA Zhang, Qing,et al."Investigation on the esterification by using supercritical ethanol for bio-oil upgrading".APPLIED ENERGY 160(2015).
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