TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The liquid biomass of pre-heating tank is fed from a feed tank (10) via a feed pump (12). The solid biomass is fed from a silo, preferably via a conveyor belt and a feed hopper (20), by a screw conveyor (21). The biomass stored in the silo is pretreated by mixing enzymes for breaking lignin contained in the biomass. The biomass in the pre-heating tank is subjected with a pressure and temperature increase to 5 bar and 150 degrees C, and is subsequently mixed. The slurry is subjected to an explosive depressurization in a pressure chamber after leaving the pre-heating tank and prior to its entry into the reaction tank. The pretreated slurry is conveyed by a slurry pump to the reaction tank, where the slurry is introduced with simultaneous addition of steam into the reaction tank, with a pressure and temperature increase of 25 bar and 210-230 degrees C, and the slurry is mixed in the reaction tank during the course of carbonation. The carbonation reaction proceeds for a predetermined period, after which the slurry is discharged by opening of a slurry discharge pipe connected with a buffer tank, which has lower internal pressure due to the pressure gradient between the reaction tank and buffer tank. The pressure applied in the buffer tank is successively lowered and the slurry is provided for post treatment after reaching atmospheric pressure in a cooling tank. The process steam accrued in the buffer tank is fed back to the reaction tank. Preferred Components: A number of reaction tanks alternative to one another, preferably 4-6 reaction tanks are chargeable from a common pre-heating tank. A number of reaction tanks, preferably 2-3 reaction tanks are emptied into at least one buffer tank. At least one pre-heating tank, at least one reaction tank and at least one buffer tank are connected to at least one common steam generator for providing the required process steam. At least one reaction tank and/or at least one buffer tank are associated with a safety valve for a pressure reduction with interposition of a silencer. EXAMPLE - No suitable example given.