Investigation of the combination of fractional condensation and water extraction for improving the storage stability of pyrolysis bio-oil. (15th April 2022)

• Record Type: Journal Article
• Authors: Xu, J.; Brodu, N.; Abdelouahed, L.; Taouk, B.
• Is Part Of: Fuel. Volume 314(2022)
• Publication Date: 2022-04-15
• Subjects: HMF 5-(Hydroxymethyl) furfural -- GVL γ-valerolactone -- DTR drop tube reactor -- BW The beechwood biomass -- Co-1, Co-2, and Co-3 condenser 1, 2, and 3 of three stage condensation system -- Oil-S, Oil-1, Oil-2, and Oil-3 pyrolysis oil products from the single condenser and fractional condensation system (the first, the second, and the third condenser, respectively) -- Oil-1-WI and Oil-2-WI water-insoluble fractions of bio-oil products (Oil-1 and Oil-2) -- Oil-1-WS and Oil-2-WS the water-soluble fraction of bio-oil products (Oil-1 and Oil-2) -- DI water deionized water -- PTFE polytetrafluoroethylene -- GC–MS gas chromatograph-mass spectrometer instrument -- GC-FID gas chromatography with flame ionization detector -- ATR-FTIR Attenuated total reflectance-Fourier transform infrared spectroscopy; Bio-oil -- Intermediate pyrolysis -- Storage stability -- Fractional condensation -- Water extraction; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2021.123019
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The stability of high temperature fractional condensation bio-oil was improved. The water extraction improved the stability of the water-insoluble fractions. The hydrolysis of sugars can produce interesting chemicals (HMF, furfural, GVL…) Abstract: To improve the storage stability of bio-oils obtained from beech wood intermediate pyrolysis in a drop tube reactor, the combination of three-stage condensation with an additional water extraction system was accomplished to produce separated and purified bio-oil products. The physicochemical properties and composition variation of bio-oil during aging at different storage temperatures (4 °C, room temperature-18 °C, and 50 °C) and different storage times (1, 2, 3, and 4 weeks) were studied and compared to that of fresh bio-oil. The water content of each bio-oil product increased compared to the fresh oil, whereas the pH value decreased slightly. GC chromatography and FT-IR analysis results showed that the chemical composition of the bio-oil changed. All the variations indicate that some reactions, such as polymerization, oxidation, polycondensation, hydrolysis of sugars, and esterification, occurred in the bio-oil samples during storage. Bio-oil products stored at 4 °C and room temperature for 4 weeks had relatively high stability, whereas the accelerated aging of bio-oil stored at 50 °C revealed a significant change in its chemical composition. The additional water extraction step specifically improved the stability of the water-insoluble fractions of the bio-oil products. However, the water-soluble fractions were not as stable as the fractions before water extraction. The high content of acid in the water-soluble fractions made it an appropriate medium for hydrolysis sugar and to produce interesting chemical components, 5-(Hydroxymethyl) furfural (HMF), 2(5H)-furanone, furfural, furan, 2, 5-dimethyl- and γ-Valerolactone (GVL).