NOVELTY - The reactor (2, 4) comprises straight or curved pipe sections, which are connected to each other using rectangular or oblique T-pieces such that they form a continuous reactor body. The reactor is formed from a combination of pipes and pressure vessels, and has a highest point, at which the reaction temperature reaches its highest value so that process between the already carbonized biomaterial and non-carbonated biomaterial is excluded by convection induced mixing. The individual pieces of a handling and mixing equipment exhibit in the form of screws.    USE - The reactor is useful for hydrothermal carbonization process.    ADVANTAGE - The compact reactor ensures economical, rapid and continuous hydrothermal carbonization process.    DETAILED DESCRIPTION - The reactor (2, 4) comprises straight or curved pipe sections, which are connected to each other using rectangular or oblique T-pieces such that they form a continuous reactor body. The reactor is formed from a combination of pipes and pressure vessels, and has a highest point, at which the reaction temperature reaches its highest value so that process between the already carbonized biomaterial and non-carbonated biomaterial is excluded by convection induced mixing. The individual pieces of handling and mixing equipment exhibit in the form of screws to prevent the carbonizing material from entering into the reactor wall and from protruding into the reactor tube. The handling and mixing equipment is present in the form of a rigid shaft with a screw or a flexible shaft without screw and driven by externally arranged drives, which are joined together as a chain drive for synchronization. The flexible shaft is fixed on the mixing and production tools in the form of a paddle. A multi-material conveyor (3, 7) present at an input of the reactor promotes the carbonizing biomaterial under pressure in the reactor. A pressure lock present at an end of the reactor removes mixture of water and carbonated coal under pressure. Each reactor section is equipped with a jacketed section, which is formed and adapted for heat transfer by means of a heat carrier fluid. Shafts of the conveyor are formed as concentric double pipes for transferring heat and conveying heat transfer fluid. A double rotary joint is present in the reactor for introducing and removing a heat carrier into the conveyor shaft. An INDEPENDENT CLAIM is included for a method of providing a controllable temperature zone within a continuously operating reactor.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a reactor.    Reactor (2, 4)    Conveyor (3, 7)    Double jackets. (5, 6)