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In this study, a novel approach for the determination of the solid mass yield from slow pyrolysis based on a comparison of the volatile matter contents of feedstock and char is presented. The approach was tested with experimental data from literature and own measurements. For these experiments, gravimetric data is available to determine the mass yield. The proposed method was compared with conventional ashbased calculations and the gravimetric determination of the yield. It was shown that the new approach does not only perform significantly better than ash-based methods, it also approximates the real mass yield of slow pyrolysis under atmospheric pressure quite accurately. These findings may indicate that secondary char formation does not contribute significantly to the mass yield of biomass pyrolysis under conditions found in practical production processes (low heating rates, atmospheric pressure and medium temperatures).

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