A non-oxidative vacuum thermal depolymerisation process for obtaining liquid circular products, bioproducts and functional carbons, wherein a hydrogen transfer takes place to produce hydrocarbons from mixtures of natural and synthetic polymeric residues, comprising the following stages: a) selecting and treating waste by means of drying, grinding and removing metallic elements and chlorinated polymers, and optionally homogenising the residue; b) adding additives to the mixture resulting from the previous stage; c) performing non-oxidative vacuum heat treatment of the mixture obtained in the previous stage at working temperatures between 100 and 200 °C for synthetic polymers or up to 300 °C for biomass, and pressures between -200 and -1000 Pa (-2 and -10 millibars); d) performing non-oxidative vacuum thermal depolymerisation of the mixture obtained in the previous stage at working temperatures between 350 °C and 750 °C and pressures between -50 and -2000 Pa (-0.5 and -20 millibars), where a carbonaceous solid and raw gases are obtained; e) adding additives to the carbonaceous solid resulting from the previous stage; f) performing non-oxidative vacuum carbonisation and functionalisation of the mixture obtained in the previous stage at temperatures higher than 450 °C and pressures between -50 and -5000 Pa (-0.5 and -50 millibars); g) wetting the carbon obtained in the previous stage to at least 15% humidity, and, optionally performing additivation and washing of the wetted carbon; h) condensing and separating the raw gases obtained in stage d) into 3 fractions: light gaseous organic fraction, heavy liquid organic fraction and very heavy liquid organic fraction; i) performing complete or partial recirculation of the very heavy organic fraction to the carbonisation reactor of stage f); j) condensing and cleaning the light gaseous organic fraction obtained in stage h) to obtain an aqueous fraction, a light organic liquid fraction and a syngas fraction; k) improving and cleaning the light organic liquid fraction obtained in the previous stage by means of adsorption columns, optionally adding stabilising compounds to the liquid fraction resulting from cleaning; l) performing complete or partial recirculation of the syngas fraction obtained in stage j) to a burner to provide energy to the different stages of the process; wherein stages b) and c) are performed simultaneously, and wherein stages e) and f) are performed simultaneously. a) selecting and treating waste by means of drying, grinding and removing metallic elements and chlorinated polymers, and optionally homogenising the residue; b) adding additives to the mixture resulting from the previous stage; c) performing non-oxidative vacuum heat treatment of the mixture obtained in the previous stage at working temperatures between 100 and 200 °C for synthetic polymers or up to 300 °C for biomass, and pressures between -200 and -1000 Pa (-2 and -10 millibars); d) performing non-oxidative vacuum thermal depolymerisation of the mixture obtained in the previous stage at working temperatures between 350 °C and 750 °C and pressures between -50 and -2000 Pa (-0.5 and -20 millibars), where a carbonaceous solid and raw gases are obtained; e) adding additives to the carbonaceous solid resulting from the previous stage; f) performing non-oxidative vacuum carbonisation and functionalisation of the mixture obtained in the previous stage at temperatures higher than 450 °C and pressures between -50 and -5000 Pa (-0.5 and -50 millibars); g) wetting the carbon obtained in the previous stage to at least 15% humidity, and, optionally performing additivation and washing of the wetted carbon; h) condensing and separating the raw gases obtained in stage d) into 3 fractions: light gaseous organic fraction, heavy liquid organic fraction and very heavy liquid organic fraction; i) performing complete or partial recirculation of the very heavy organic fraction to the carbonisation reactor of stage f); j) condensing and cleaning the light gaseous organic fraction obtained in stage h) to obtain an aqueous fraction, a light organic liquid fraction and a syngas fraction; k) improving and cleaning the light organic liquid fraction obtained in the previous stage by means of adsorption columns, optionally adding stabilising compounds to the liquid fraction resulting from cleaning; l) performing complete or partial recirculation of the syngas fraction obtained in stage j) to a burner to provide energy to the different stages of the process;