期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 142, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jaap.2019.104662
关键词
Biomass; Flash pyrolysis; Bio-oil; Fractional condensation; Pyrolytic lignin; Polymer characterization; SEC-MALS; MALS
资金
- Agence Nationale de la Rercherche (ANR) as part of the CATAPULT project (Catalyst for the production of chemical and bio-fuels)
A rapid method was developed to characterize the Pyrolytic Lignin (PL) fraction of flash pyrolysis bio-oils, based on size exclusion chromatography (SEC) coupled to differential refractive index (DRI) and multi-angle laser light scattering (MALS) detectors. Two beech wood bio-oils with different PL content were used in the study. The first was produced with a single-stage condensation system (BO), while the second was an organic fraction collected in the first stage of a two-stage condensation system (F1). PL was isolated from both the BO and F1 bio-oils by the water precipitation method. Our results suggested that quantification of the pyrolytic lignin fraction of biooils can be performed by the SEC-MALS-DRI method provided that the specific refractive index increment (dn/dc) is known, and the integration interval is carefully chosen. Average molar mass (M-n) values for the BO and F1 samples were 580 +/- 50 Da and 890 +/- 50 Da, respectively. Our results indicated that the condensation system and the water precipitation method affect the average molar mass of isolated PL oligomers.
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