Physical characterisation of biomass-based pyrolysis liquids: Application of standard fuel oil analyses

Anja Oasmaa, Eero Leppämäki, Päivi Koponen, Johanna Levander, Eija Tapola

    Research output: Book/ReportReport

    48 Citations (Scopus)


    The main purpose of the study was to test the applicability of standard fuel oil methods developed for petroleum-based fuels to pyrolysis liquids. In addition, research on sampling, homogeneity, stability, miscibility and corrosivity was carried out. The standard methods have been tested for several different pyrolysis liquids. Recommendations on sampling, sample size and small modifications of standard methods are presented. In general, most of the methods can be used as such but the accuracy of the analysis can be improved by minor modifications. Fuel oil analyses not suitable for pyrolysis liquids have been identified. Homogeneity of the liquids is the most critical factor in accurate analysis. The presence of air bubbles may disturb in several analyses. Sample preheating and prefiltration should be avoided when possible. The former may cause changes in the composition and structure of the pyrolysis liquid. The latter may remove part of organic material with particles. The size of the sample should be determined on the basis of the homogeneity and the water content of the liquid. The basic analyses of the Technical Research Centre of Finland (VTT) include water, pH, solids, ash, Conradson carbon residue, heating value, CHN, density, viscosity, pour point, flash point, and stability. Additional analyses are carried out when needed.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages46
    ISBN (Print)951-38-5051-X
    Publication statusPublished - 1997
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications


    • pyrolysis
    • termal decomposition
    • liquids
    • sampling
    • homogeneity
    • solubility


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