NOVELTY - Preparation of char from organic waste comprises sorting waste to remove foreign materials, shredding the waste, pyrolyzing waste at 450-600degreesF, and using the liquid and gaseous byproducts of pyrolysis for the production of mechanical work. The work is used to perform the pyrolysis of the third step. The waste is reduced to uniform, hard granular solid product by in-situ heating, and mixing caused by the reactor.    USE - For preparation of char or synthetic coal from organic waste.    ADVANTAGE - The use of in-situ heating in and throughout the well-stirred reactor provides very rapid heating and conversion of waste materials without the limitations in reaction rate imposed by transfer of heat through reaction walls and other surfaces. It also provides scaling of reactor capacity based on reactor volume rather than the area of the heated surface. The heating of waste material for pyrolysis is accomplished with minimal risk of ash softening and deposition on reactor walls and other heating surfaces. It also minimizes the loss of heat from reactor, thus improving conversion efficiency (claimed). The invention produces highly uniform granular synthetic product in energy content and handling characteristics to but cleaner burning than the natural coal.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for organic waste material converting system comprising separator sorting waste material for pyrolysis from waste material not for pyrolysis, drive unit for converting energy generated from byproduct oils and gases in the conversion process into mechanical work necessary to drive pyrolytic conversion in the reactor through in-situ heating, reactor with extruder design, and boiler. The reactor uses co-rotating mixers to impart mechanical work to the waste material transported through it. The reactor includes drying zone. The waste material is heated in the drying zone for moisture removal through first reactor vent. The reactor has pyrolytic zones, mixing mechanism in drying and pyrolytic zones. The pyrolytic zones are downstream of the drying zone. The pyrolysis occurs in the pyrolytic zones enabling the release of fluid through additional reactor vent(s). The waste material is compacted within the drying and pyrolytic zones to form mass of moving treated material filling the cross section of the reactor and functioning as barrier to contain vapors in the drying and pyrolytic zones. The pyrolytic zones heat the treated material while extending the residence time of mixing. The reactor downstream of the oil vent has forwarding and reversing mixing mechanism to move the treated material to reactor discharge port. The boiler uses byproduct oils, gases, or vapor from the reactor to recover energy for recycling through the reaction process.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the process.