NOVELTY - The method for processing a glycerin-containing reactant mixture (G) to an intermediate product for producing a hydrogen-containing product mixture from the intermediate product by pyrolysis (3) to obtain a pyrolysis product and catalytic reaction of the pyrolysis product, comprises partially evaporating the reactant mixture at 200-220 degrees C and an absolute pressure of 50-85 mbar by thin-film evaporation (1) to obtain an evaporation product (V), washing (2) the evaporation product in a washer, and introducing crude glycerin or sub-standard glycerin from biodiesel production as reactant mixture.    USE - Method for processing a glycerin-containing reactant mixture to an intermediate product for producing a hydrogen-containing product mixture from the intermediate product by pyrolysis to obtain a pyrolysis product and catalytic reaction of the pyrolysis product.    ADVANTAGE - The method is capable of economically processing the reactant mixture with less energy requirements thus efficiently producing the hydrogen-containing product mixture with high purity.    DETAILED DESCRIPTION - The method for processing a glycerin-containing reactant mixture (G) to an intermediate product for producing a hydrogen-containing product mixture from the intermediate product by pyrolysis (3) to obtain a pyrolysis product and catalytic reaction of the pyrolysis product, comprises partially evaporating the reactant mixture at 200-220 degrees C and an absolute pressure of 50-85 mbar by thin-film evaporation (1) to obtain an evaporation product (V), washing (2) the evaporation product in a washer, introducing crude glycerin or sub-standard glycerin from biodiesel production as reactant mixture, and pre-treating the reactant mixture by cleaning, drying and/or saponification. INDEPENDENT CLAIMS are included for:    (1) a method for producing a hydrogen-containing product mixture from an intermediate product produced from a reactant mixture; and    (2) a device for producing a hydrogen-containing product mixture from an intermediate product produced from a reactant mixture.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method for processing a glycerin-containing reactant mixture to an intermediate product.    Thin-film evaporation (1)    Washing an evaporation product (2)    Pyrolysis (3)    Reactant mixture (G)    Evaporation product. (V)