TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: After the completion of the reaction phase, water is found in the reaction vessel, where the water is from a water content of the biomass added into the reaction vessel, before the reaction phase and a condensate, which is formed from water vapor that is supplied before/or during the reaction phase. A chemical catalyst is added to the biomass before or during the reaction phase. The biomass is partially present in liquid water and water vapor during the reaction phase. During the reaction phase, the pressure and temperature are kept at a desired level by the addition of further high pressure vapor. The pressure increase in the reaction vessel, is induced by exothermic reactions during the carbonation process, and compensated by opening a safety valve and blowing water vapor or hot gas under the consideration of a limit. At least one liquid is temporarily added into the reaction vessel as a function of temperature increase during the reaction phase. The biomass is treated with a catalyst material before adding into the reaction vessel. During the reaction phase, no further catalyst material is added into the reaction vessel. A hydrogen gas formed as an intermediate during the reaction phase is separated to the reaction vessel. The lighter hydrogen gas is accumulated at the top of the vessel and is separated from other gaseous components such as carbon dioxide, nitrogen, water and oxygen under the influence of gravity in a settling tank (19), where a membrane is used for the separation. A gas or a gas mixture is sucked in by a gas pump from the reaction vessel and is directed to an external device for hydrogen gas-separation and a part of the gas mixture is fed back into the reaction vessel after the hydrogen gas-separation. The water removed from the reaction vessel is cooled at high pressure and high temperature of 95-100 degrees C using high tempered heat and placed in a pressure reducing device at an ambient pressure and then directed to a cleaning device. The water removed from the reaction vessel is cooled in a first cooling step and subsequent pressure reduction in a second cooling step using low-tempered heat and then supplied to a cleaning system. The heat generated by cooling the process water is used for external heat consumption. The heat generated in the process is used for drying the biomass before adding into the reactor. The cooled and purified water is used as feed water for steam generator. The water effluent from the reaction vessel is at least partially cleaned using an ultrafiltration or reverse osmosis. The biomass is added into the reaction vessel as liquid and separated, where the addition and separation are performed by rotating a substrate basket. The biomass is added into the substrate basket and is mixed in the reaction vessel in such a pendulum motion that the biomass is at least partially turned in the water or in an aqueous solution. The water vapor from the reaction tank is sucked in by a vapor injector, and is fed into an external device for hydrogen gas separation and then fed back into reaction vessel after hydrogen gas separation. The heat energy required for heating the reaction vessel and for maintaining temperature during the reaction phase is at least partially supplied by steam injection using steam injector. The production of coal, as chemically bound energy, is coupled in multi-step process control in hydrogen gas as energy carrier. The process is operated in a cyclic manner, where at the beginning of the cycle, the open reactor is loaded with biomass and closed, the reactor is heated by supplying steam at a desired temperature level, the reactor is decompressed and cooled after the completion of the reaction by venting of steam and when reaching the unpressurized state, the reactor is again opened and emptied. The process is continuously performed with a reactor that is situated at high pressure and temperature, where an input chamber, arranged upstream to the reactor, is operated with varying pressure level for the addition of biomass and an input chamber, arranged downstream to the reactor, is operated with varying pressure level for discharging the produced coal. A flap is closed between the input chamber and the reactor and between the reactor and the outlet chamber with which an increasing pressure difference is pressed between the reactor and related input or output chamber during the pressure-release phase with larger expectant compressive force in the sealings, so that the sealing effect in the flaps is strengthened. A pressure build-up in the inlet chamber in a first step takes place by introducing water vapor of the pressure reduction phase of the outlet chamber and in the second step, heating steam is supplied from an external steam generator. The pressure build-up in the outlet chamber takes place in two steps, where fuel is used for the compression of steam in first step of pressure build-up phase of the inlet chamber during the pressure release phase and a heating steam is supplied in the inlet chamber in the second step of pressure build-up phase. The compression phase of the reactor is at least partially operated with steam from the pressure release phase of another reactor for cyclic operation of two or more reactors. The water present at the end of the reaction phase in the reaction vessel is removed by introducing high pressure steam via a release valve from the vessel, and is cooled in a cooling step and cleaned in a cleaning device of all foreign matter. EXAMPLE - None given.