NOVELTY - The method for producing gaseous, liquid or solid-like carbonaceous intermediate products for use in plants for the production of synthetic hydrocarbon, comprises obtaining plastic as starting material from waste material, and mixing the plastic to other organic feedstock in the ratio of 10-90%. The mixing of the plastic takes place with biological residual materials (4) from the agriculture in a biomass-to-liquid process. The plastic is mixed with carbon. The mixing of the plastic causes an increase of the specified carbon density and a performance increase of a reactor (7).    USE - Method for producing gaseous, liquid or solid-like carbonaceous intermediate products for use in plants for the production of synthetic hydrocarbon such as diesel fuels, petroleum and natural gas.    ADVANTAGE - The method ensures economical and efficient production of the gaseous, liquid or solid-like carbonaceous intermediate products without unwanted foreign matter.    DETAILED DESCRIPTION - The method for producing gaseous, liquid or solid-like carbonaceous intermediate products for use in plants for the production of synthetic hydrocarbon, comprises obtaining plastic as starting material from waste material, and mixing the plastic to other organic feedstock in the ratio of 10-90%. The mixing of the plastic takes place with biological residual materials (4) from the agriculture in a biomass-to-liquid process. The plastic is mixed with carbon. The mixing of the plastic causes an increase of the specified carbon density and a performance increase of a reactor (7) against the use of the pure biological feedstock, directly takes place in the reactor at the entrance for synthesis gas production and during processing the biological feedstock, and is regulated over the reactor performance. INDEPENDENT CLAIMS are included for:    (1) a reactor for producing gaseous, liquid or solid-like carbonaceous intermediate products for use in plants for the production of synthetic hydrocarbon; and    (2) a device for producing gaseous, liquid or solid-like carbonaceous intermediate products for use in plants for the production of synthetic hydrocarbon.    DESCRIPTION OF DRAWING(S) - The figure shows a circuit diagram of a method for producing gaseous, liquid or solid-like carbonaceous intermediate products.    Residual materials (4)    Pipeline (6)    Reactor (7)    Boiler (9)    Condenser. (19)