Analysis of switchgrass-derived bio-oil and associated aqueous phase generated in a semi-pilot scale auger pyrolyzer

Ren, Shoujie; Ye, X. Philip; Borole, Abhijeet P.; Kim, Pyoungchung; Labbé, Ncole

doi:10.1016/j.jaap.2016.03.013

Analysis of switchgrass-derived bio-oil and associated aqueous phase generated in a semi-pilot scale auger pyrolyzer

Journal Article · Wed Mar 30 04:00:00 EDT 2016 · Journal of Analytical and Applied Pyrolysis

DOI:https://doi.org/10.1016/j.jaap.2016.03.013· OSTI ID:1311225

Ren, Shoujie ^[1]; Ye, X. Philip ^[1]; Borole, Abhijeet P. ^[2]; Kim, Pyoungchung ^[3]; Labbé, Ncole ^[3]

Univ. of Tennessee, Knoxville, TN (United States). Biosystems Engineering and Soil Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Bioscience Division
Univ. of Tennessee, Knoxville, TN (United States). Center for Renewable Carbon

To efficiently utilize water-soluble compounds in bio-oil and evaluate the potential effects of these compounds on processes such as microbial electrolysis, our study investigated the physico-chemical properties of bio-oil and the associated aqueous phase generated from switchgrass using a semi-pilot scale auger pyrolyzer. Combining separation and detection strategies with organic solvent extraction, an array of analytical instruments and methods were used to identify and quantify the chemical constituents. Separation of an aqueous phase from crude bio-oil was achieved by adding water (water: crude bio-oil at 4:1 in weight), which resulted in a partition of 61 wt.% of the organic compounds into a bio-oil aqueous phase (BOAP). GC/MS analysis for BOAP identified over 40 compounds of which 16 were quantified. Acetic acid, propionic acid, and levoglucosan are the major components in BOAP. In addition, a significant portion of chemicals that have the potential to be upgraded to hydrocarbon fuels were extracted to BOAP (77 wt.% of the alcohols, 61 wt.% of the furans, and 52 wt.% of the phenolic compounds in crude bio-oil). Valorization of the BOAP may require conversion methods capable of accommodating a very broad substrate specificity. Ultimately, a better separation strategy is needed to selectively remove the acidic and polar components from crude bio-oil to improve economic feasibility of biorefinery operations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1311225

Alternate ID(s):: OSTI ID: 1348254

Journal Information:: Journal of Analytical and Applied Pyrolysis, Journal Name: Journal of Analytical and Applied Pyrolysis Journal Issue: C Vol. 119; ISSN 0165-2370

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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