NOVELTY - Batch process for pyrolysis of cuttings of organic material involves use of mechanical fluidized bed reactor. Included is a means to monitor the weight of content of the shell, the electrical current flow to the heating system to yield a non-condensable fraction of gas, and a carbonaceous slid residue. One tenth of the batch is added in one lump, and is completely pyrolyzed before the rest of the batch is added continuously.    USE - For pyrolysis of organic material, which may be waste, comprising wood, paper, cardboard; rubbers, elastomers, plastics and polymers, optionally with chemically bonded fluorine, chlorine or nitrogen; any kind of tire; food waste from food processing factories; dried wastes from slaughterhouses, animal cadavers, fish and cattle meal etc. (claimed)    ADVANTAGE - The use of a mechanical mixer in the pyrolysis reactor avoids problems with the plastic transition stage of material during its heating, and the controlled treatment of a small batch of waste first reduces torque load on the mixer. Solid, non-pyrolyzable wastes, such as metals and minerals, conventionally form into large aggregates, which can block the reactor, choke the outlet or prevent the reactor from operating properly. These can be removed after completion of pyrolysis. Further, downtime between end of processing of one batch and beginning another is reduced. The investment and operation costs are reduced, by avoiding need of a peak capacity.    DETAILED DESCRIPTION - Batch process for pyrolysis of cuttings of organic material, including waste materials, involves use of mechanical fluidized bed reactor with a shell (1) with a revolving mixer (2) driven by an electrical motor (4) and heated electrically. Included is a means to monitor the weight of content of the shell, the electrical current flow to the heating system to yield a non-condensable fraction of gas, and a carbonaceous slid residue. One tenth of the batch is added in one lump, and is completely pyrolyzed before the rest of the batch is added continuously.    An INDEPENDENT CLAIM is included for a fluidized bed reactor for use in the above process, which comprises a horizontally-laying steel cylinder, closed at both ends with steel plates. The revolving shaft is along the axis of the cylinder, with mixing paddles fixed. The cylindrical part of the reactor is heated from outside using electricity.    DESCRIPTION OF DRAWING(S) - The drawing shows a reactor as above.    shell (1)    revolving mixer (2)    motor (3)