the present invention relates to the recycling by depolymerisation through thermolysis . a method and installation for depolymerisation through efficient thermolysis for recycling is provided that allow the production of light hydrocarbons having high quality and being free of impurities and contaminants . this objective is achieved by methods and installations where either the secondary products of the process are re - fed to supply energy for the main recycling process or are refined to manufacture final usable and saleable products . therefore , the use of the energy content of the starting materials is maximised by assuring their full utilisation , minimising the environmental harm while an energetically autonomous installation is provided . all the components of the waste or starting material may be recycled , by physico - chemical means , and no additional contaminant waste is produced .