NOVELTY - The apparatus has a thermolysis tank (1) heated by a hot air generator (2) and is filled with molten plastic from a melting tank and is supplied with a catalyst from a tank (4). A solid catalyst chamber (5) is configured in the downstream of the thermolysis tank and is followed by a condenser (6) which condenses vapours produced in the thermolysis tank into oil.    DETAILED DESCRIPTION - The thermolysis tank is connected to the melting tank which is connected to a neutralisation tank by a pipeline. Hydrochloric acid gas (Hcl) produced during melting of plastics scrap in the melting tank is extracted by a pipeline and fed to the neutralisation tank where it is neutralised with chemicals such as caustic soda. A pipeline feeds Hcl extracted molten plastic scrap to the thermolysis tank from the melting tank. The condenser condenses vapours produced by decomposition of the plastic scrap into oil. The condenser has fractional distillation units which produce different fractions of the oil by changing the temperature of the coolant flowing in the condenser. A pipeline which supplies the coolant connects the downstream condenser units to the upstream units so that the temperature of the coolant is higher near the upstream condenser. A fractional distillation unit is connected to the hot air generator through a pipeline which supplies cracked oil as a fuel for the hot air generator. A pipeline connects the condenser with a gas tank which is filled with gas which has not been condensed by the condenser.    USE -   For reprocessing of plastics scrap to produce useful oil such as gasoline, kerosene, light oil.    ADVANTAGE -   The thermolysis apparatus is made small because thermolysis is executed in two steps using a organic catalyst and solid catalyst, respectively. Thermolysis efficiency is improved. The thermolysis apparatus is economical because the cracked oil produced in the fractional distillation unit is used as a fuel for hot air generator. When thermolysis of polyvinyl chloride is executed HCl resulting from PVC is extracted and neutralised in the neutralisation unit. Hence, there is no environmental hazards. Safety of operation is improved.    DESCRIPTION OF DRAWING(S) - The figure shows the systematic diagram of the thermolysis apparatus. (1) Thermolysis tank; ; (2) Hot air generator; ; (4) Organic catalyst tank; ; (5) Solid catalyst tank; ; (6) Condenser.