Fast pyrolysis of forestry residue and pine: 4. Improvement of the product quality by solvent addition

Anja Oasmaa, Eeva Kuoppala, Johan Fredrik Selin, Steven Gust, Yrjö Solantausta

    Research output: Contribution to journalArticleScientificpeer-review

    186 Citations (Scopus)


    Addition of alcohols was found to improve the homogeneity, decrease the viscosity and density, lower the flash point, and increase the heating value of pyrolysis liquids. Alcohol addition also lowered the viscosity and molecular mass increase during the aging of pyrolysis liquids. The reduction in the viscosity change was primarily due to a stabilizing effect of alcohols on the water-insoluble high molecular mass lignin-derived fraction. Other effects include the formation of acetals in reactions of alcohols with aldehydes, ketones, and anhydrosugars. Low (≤ 5 wt %) alcohol additions prevented aging reactions by a few months, while the higher (≥ 10 wt %) ones retarded them by almost a year. Methanol was the most effective alcohol of those tested (methanol, ethanol, isopropanol). By improving solubility, the alcohols also enhanced the separation of the extractive-rich top layer in the pyrolysis of forestry residue by decreasing its volume and increasing the concentration of extractives and solids in the top layer.

    Original languageEnglish
    Pages (from-to)1578-1583
    Number of pages6
    JournalEnergy & Fuels
    Issue number5
    Publication statusPublished - 1 Sept 2004
    MoE publication typeA1 Journal article-refereed


    • fast pyrolysis
    • pyrolysis
    • biofuels
    • forest residues
    • wood residues
    • liquid biofuels
    • pyrolysis liquid


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