NOVELTY - A mixture is formed from comminuted, dried, biogenic raw material, carrier fluid and catalytically-active material. It is heated to 300 - 400 degrees C without application of pressure, causing reaction. Fuel arising, is separated from the mixture and optionally hydrogenated and recycled. Hydrogenation takes place during separation or the final stage. The catatalytically-active material is an alkali metal, an alkaline earth metal and/or transition metals, especially selected from Na, K, Ca, Mg, Cr, Cu, Zn. It may be formed in situ.    USE - To produce fuel from solid biogenic raw materials.    ADVANTAGE - The plant is economical to operate, produces valuable products from wastes and operates with a high yield. It conforms with emission limits. A very wide range of possible feedstocks, i.e. biogenic, or biomass feed materials, is listed. Organic products recovered from the process, conform with requirements of internal combustion engine fuels. Possible plant arrangements and variants are discussed at length.    DETAILED DESCRIPTION - The catalytically-active material is a hydroxide and/or carbonate of Ca, Mg, K and Na, either as a single substance or mixture. It is a natural mineral clay containing montmorillonite, illite and/or smectite. The raw material is initially impregnated with carrier fluid at 150 - 200 degrees C. Gases formed are condensed separately. The raw material contains or comprises lignocellulose. Gases formed during reaction are separately condensed. They are recovered as three phases: oil product, heavy oil product and aqueous phase; these are processed separately. The oil is hydrogenated and optionally rectified. Catalytic hydrogenation is employed using Ni/MoS and Pd/Pt catalysts. The conditions are 3 - 50 bar, 100-350 degrees C and residence time 5 - 30 minutes. Carbon product is steam-reformed at 750-950 degrees C and 3 - 50 bar, with subsequent water gas shift reaction. The carrier fluid is the bottoms product of a vacuum distillation plant for crude oil processing. Carrier oil fluid is added continuously to form 30-90% of the fuel quantity formed in the first stage of reaction. Hydrogen used for hydrogenation is recovered partly or entirely from glycerine. The plant used, includes a heated impregnator, heated reaction vessel optionally with catalyst dosing, one or more carbon/oil separators, a catalytic hydrogenation reactor and a gas engine. The plant may be connected to a refinery for crude oil. An INDEPENDENT CLAIM is included for the plant used.    DESCRIPTION OF DRAWING(S) - The drawing shows a block schematic flow diagram of the main conversion unit and power plant.(Drawing includes non-English language text)