Abstract: Dead animal material, such as offal, is in subsequent steps and in a continuous manner comminuted in a comminuter, pumped to a pre-heating/sterilization installation by a pump, heated to the sterilization temperature in a number of successive tubular heat exchangers and, for some time, kept at the sterilization temperature in a long tube, reduced in pressure in a sluice system fed through a cyclone and finally further processed to the desired end product. The heat exchangers and the tube are connected to one another to a long closed tube through which the material flows in a plug flow. Vapors set free in the cyclone are used for the first pre-heating of the material.