Molecular composition of oxygenated compounds in fast pyrolysis bio-oil and its supercritical fluid extracts

Cheng, Tingting; Han, Yehua; Zhang, Yanfen; Chen, Xu

doi:10.1016/j.fuel.2015.12.075

Cited by 51 publications

(39 citation statements)

References 36 publications

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“…The organic fraction of a biooil produced from mixed biomass of wheat and wood sawdust was isolated by supercritical CO 2 (SC-CO 2 ), and the first fraction of SC-CO 2 extraction collected at 25 MPa was enriched with furanoids (9.9%), pyranoids (9.0%), and benzenoids (44.8%) [ 102 ]. Cheng et al [ 106 ] carried out a three-step SC-CO 2 extraction for the selective fractionation of fast pyrolysis biooil. Different classes of oxygen-containing compounds in biooil were enriched in different fractions, facilitating the following detailed analysis.…”

Section: Fractionation Techniquesmentioning

confidence: 99%

Analytical Strategies Involved in the Detailed Componential Characterization of Biooil Produced from Lignocellulosic Biomass

et al. 2017

International Journal of Analytical Chemistry

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Elucidation of chemical composition of biooil is essentially important to evaluate the process of lignocellulosic biomass (LCBM) conversion and its upgrading and suggest proper value-added utilization like producing fuel and feedstock for fine chemicals. Although the main components of LCBM are cellulose, hemicelluloses, and lignin, the chemicals derived from LCBM differ significantly due to the various feedstock and methods used for the decomposition. Biooil, produced from pyrolysis of LCBM, contains hundreds of organic chemicals with various classes. This review covers the methodologies used for the componential analysis of biooil, including pretreatments and instrumental analysis techniques. The use of chromatographic and spectrometric methods was highlighted, covering the conventional techniques such as gas chromatography, high performance liquid chromatography, Fourier transform infrared spectroscopy, nuclear magnetic resonance, and mass spectrometry. The combination of preseparation methods and instrumental technologies is a robust pathway for the detailed componential characterization of biooil. The organic species in biooils can be classified into alkanes, alkenes, alkynes, benzene-ring containing hydrocarbons, ethers, alcohols, phenols, aldehydes, ketones, esters, carboxylic acids, and other heteroatomic organic compounds. The recent development of high resolution mass spectrometry and multidimensional hyphenated chromatographic and spectrometric techniques has considerably elucidated the composition of biooils.

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Section: Fractionation Techniquesmentioning

confidence: 99%

Analytical Strategies Involved in the Detailed Componential Characterization of Biooil Produced from Lignocellulosic Biomass

et al. 2017

International Journal of Analytical Chemistry

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“…This process allows the transformation of biomass into bio-oil, a combustible liquid that is easy to store and transport. Yields of 50-75% of bio-oil with a much higher volume energy density than the original feedstock can typically be obtained [7]. Bio-oils obtained from lignocellulosic biomass are dark brown organic liquids containing the degradation products of cellulose, hemicellulose and lignin [8].…”

Section: Introductionmentioning

confidence: 99%

Production of gaseous and liquid bio-fuels from the upgrading of lignocellulosic bio-oil in sub- and supercritical water: Effect of operating conditions on the process

Remón

Arcelus-Arrillaga

García

et al. 2016

Energy Conversion and Management

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This work analyses the influence of the temperature (310-450 ºC), pressure (200-260 bar), catalyst/bio-oil mass ratio (0-0.25 g catalyst/g bio-oil), and reaction time (0-60 min) on the reforming in sub-and supercritical water of bio-oil obtained from the fast pyrolysis of pinewood. The upgrading experiments were carried out in a batch microbomb reactor employing a co-precipitated Ni-Co/Al-Mg catalyst. This reforming process turned out to be highly customisable for the valorisation of bio-oil for the production of either gaseous or liquid bio-fuels. Depending on the operating conditions and water regime (sub/supercritical), the yields to upgraded bio-oil (liquid), gas and solid varied as follows: 5-90%, 7-91% and 3-31%, respectively. The gas phase, having a LHV ranging from 2 to 17 MJ/m 3 STP, was made up of a mixture of H 2 (9-31 vol.%), CO 2 (41-84 vol.%), CO (1-22 vol.%) and CH 4 (1-45 vol.%). The greatest H 2 production from bio-oil (76% gas yield with a relative amount of H 2 of 30 vol.%) was achieved under supercritical conditions at a temperature of 339 ºC, 200 bar of pressure and using a catalyst/bio-oil ratio of 0.2 g/g for 60 minutes. The amount of C, H and O (wt.%) in the upgraded bio-oil varied from 48 to 74, 4 to 9 and 13 to 48, respectively. This represents an increase of up to 37% and 171% in the proportions of C and H, respectively, as well as a decrease of up to 69% in the proportion of O. The HHV of the treated bio-oil shifted from 20 to 35 MJ/kg, which corresponds to an increase of up to 89% with respect to the HHV of the original bio-oil. With a temperature of around 344 ºC, a pressure of 233 bar, a catalyst/bio-oil ratio of 0.16 g/g and a reaction time of 9 minutes a compromise was reached between the yield and the quality of the upgraded liquid, enabling the transformation of 62% of the bio-oil into liquid with a HHV (29 MJ/kg) about twice as high as that of the original feedstock (17 MJ/kg).

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“…This can be essential for pyrolysis oils that contain a large mass fraction of relatively low-boiling organic An inert packing material can be used to provide feed dispersion, thus increasing the contact area of CO 2 and the feed. For this purpose, glass beads [64,103,127,128,133] can be used, or a porous media (e.g., silica, activated carbon) [43,84,130,131] on which the bio-oil can be adsorbed prior to the sCO 2 extraction. In the latter case, some authors reported the introduction of effects that render the interpretation of the extraction results more complex.…”

Section: Sco 2 Extraction Of Lignocelulosic Bio-oilsmentioning

confidence: 99%

“…Depending on the applied conditions, extraction yield values in the range 0.1 wt% to 48.9 wt% are reported using pure sCO 2 . Cheng et al [131] achieved up to 71 wt% extraction yield with the use of up to 25 vol% of methanol as a co-solvent.…”

Section: P (Bar) T ( • C) Co 2 Density (Kg/m 3 ) F (G) Co 2 Flow (G/mmentioning

confidence: 99%

Supercritical Carbon Dioxide Extraction of Lignocellulosic Bio-Oils: The Potential of Fuel Upgrading and Chemical Recovery

Montesantos

Maschietti

2020

Energies

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Bio-oils derived from the thermochemical processing of lignocellulosic biomass are recognized as a promising platform for sustainable biofuels and chemicals. While significant advances have been achieved with regard to the production of bio-oils by hydrothermal liquefaction and pyrolysis, the need for improving their physicochemical properties (fuel upgrading) or for recovering valuable chemicals is currently shifting the research focus towards downstream separation and chemical upgrading. The separation of lignocellulosic bio-oils using supercritical carbon dioxide (sCO2) as a solvent is a promising environmentally benign process that can play a key role in the design of innovative processes for their valorization. In the last decade, fundamental research has provided knowledge on supercritical extraction of bio-oils. This review provides an update on the progress of the research in sCO2 separation of lignocellulosic bio-oils, together with a critical interpretation of the observed effects of the extraction conditions on the process yields and the quality of the obtained products. The review also covers high-pressure phase equilibria data reported in the literature for systems comprising sCO2 and key bio-oil components, which are fundamental for process design. The perspective of the supercritical process for the fractionation of lignocellulosic bio-oils is discussed and the knowledge gaps for future research are highlighted.

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Molecular composition of oxygenated compounds in fast pyrolysis bio-oil and its supercritical fluid extracts

Cited by 51 publications

References 36 publications

Analytical Strategies Involved in the Detailed Componential Characterization of Biooil Produced from Lignocellulosic Biomass

Analytical Strategies Involved in the Detailed Componential Characterization of Biooil Produced from Lignocellulosic Biomass

Production of gaseous and liquid bio-fuels from the upgrading of lignocellulosic bio-oil in sub- and supercritical water: Effect of operating conditions on the process

Supercritical Carbon Dioxide Extraction of Lignocellulosic Bio-Oils: The Potential of Fuel Upgrading and Chemical Recovery

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