NOVELTY - The method involves dry distilling the raw material in separate dry distillation zones (2) maintained at different pressure and different temperature. The gasifiable materials and compounds are recovered from the dry distillation zones in different conditions. The raw material is compressed in the dry distillation zone using piston (4). The dry distillation zones are overlapped and anti-parallel with each other. The raw material is induced to flow between the overlapping dry distillation zones in the horizontal direction.    USE - Method for treating powdery raw biomaterial in tubular retort.    ADVANTAGE - Since raw material is dry distilled in separate dry distillation zones maintained at different pressure and different temperature, efficiency of the dry distillation process can be improved and cost required for treating raw biomaterial can be reduced.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for apparatus for treating powdery raw biomaterial, has multi-layer dry distiller (1) which is provided with separate dry distillation tubes (3) maintained at different pressure and different temperature for implementing different dry distillation zones. The dry distillation tubes are overlapped and anti-parallel with each other. An end of the dry distillation tube is provided with piston and feed opening (7). The piston is provided for compressing the raw material. The feed opening is provided for receiving the raw material. An opposite end of the dry distillation tube is provided with valve (5) and outlet opening (8). The valve is provided for recovering gasifiable materials and compounds. The outlet opening is provided for removing the raw material. A lower portion of the outlet opening is attached to heat exchanger (6) for heating the dry distillation tube.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the apparatus for treating powdery raw biomaterial.    Multi-layer dry distiller (1)    Dry distillation zone (2)    Dry distillation tube (3)    Piston (4)    Valve (5)    Heat exchanger (6)    Feed opening (7)    Outlet opening (8)