NOVELTY - Reactor for producing carbon-containing products from biomass via hydrothermal carbonization, comprises: a stainless steel shell; a first inlet (21) in an upper area of the reactor for a first line; at least one outlet (23) in a lower area of the reactor for a third line; a second inlet (22) in the upper area of the reactor; and at least one stirrer to provide additional mixing and circulation of the biomass. The first and the third lines supply a solid/liquid mixture. The second inlet is connected with the outlet via a second line, which is provided with a heat exchanger and a pump (30).    USE - The reactor is useful for producing carbon-containing products from biomass via hydrothermal carbonization.    ADVANTAGE - The reactor ensures high production safety and noise immunity.    DETAILED DESCRIPTION - Reactor for producing carbon-containing products from biomass via hydrothermal carbonization, comprises: a stainless steel shell; a first inlet (21) in an upper area of the reactor for a first line; at least one outlet (23) in a lower area of the reactor for a third line; a second inlet (22) in the upper area of the reactor; and at least one stirrer, which provides additional mixing and circulation of the biomass. The first and the third lines supply a solid/liquid mixture. The second inlet is connected with the outlet via a second line, which is provided with a heat exchanger and a pump (30), where the solid/liquid mixture is pumped into the reactor via the outlet and the second inlet. An INDEPENDENT CLAIM is also included for operating the reactor, comprising: circulating the reacting biomass in the reactor during the reaction process from the outlet to the second inlet in the upper area of the reactor via the second line, where the stirrer is provided in the reactor for additional mixing and circulation of the biomass; monitoring the reaction process occurring in the reactor by several sensors (25), and determining the values of various process parameters; and transmitting the different values of the process parameters to a program controller, which maintains the process parameters of the reaction process in the reactor in a range of pre-determined variation.    DESCRIPTION OF DRAWING(S) - The drawings 1 and 2 show a schematic representation of the reactor for carrying out the hydrothermal carbonization of the biomass, respectively (drawing includes non-English language text).    First inlet (21)    Second inlet (22)    Outlet (23)    Sensors (25)    Pump (30)