TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The preparation and separation unit separates the materials into third sub-group(s). It comprises a shredding device for homogenizing the materials, a mixing device for the shredded materials, a demetallizing device for the materials, and a storage device for the first and second sub-groups of materials. The first reactor comprises a gasification tower (501) connected with plasma torches (507), and the second reactor comprises a gasification tower (511) connected with oxyhydrogen torches (517). The introduction device comprises injectors (515) connected with the second reactor and connection pipe(s) (514) for connecting the first tower with the injectors. The gasification unit comprises third reactor(s) (52) in series and connected to the second reactor and into which the third sub-group of materials is introduced. A second introduction device introduces the gases produced by the second reactor into the third reactor. The first reactor is operable at 3000-4000 degreesC. The second reactor is operable at 1200-1600 degreesC. The third reactor is operable at 800-1000 degreesC. The plant can be connected to an information network for the collection of materials. Transmission units transmit a request by a user for differentiated collection of determinate materials selected according to the predetermined parameters. An operating center connected to the transmission units receives and coordinates the different request signals to prepare a relative collection of the materials separated into first and second sub-groups. An auxiliary service unit is connected to the gasification unit. The auxiliary device comprises a producing mechanism for the production of comburent mechanism, and an accumulation mechanism for accumulating water. A unit for making the materials inert connected is connected to the gasification unit. It makes the solid vitrified residues reusable. A purification unit is downstream of the gasification unit to purify the gases. The purification unit comprises cooling device(s) to cool the gases, a condensation device, a filter device, and/or a separation device to separate polluting elements. A connection device connects the purification unit to the auxiliary service unit to send the water produced by the condensation device to the accumulation mechanism. A transformation and separation unit transforms and separates the mixture of gases. The transformation and separation unit comprises a conversion device with a catalyst to convert carbon monoxide into carbon dioxide, a holding device to hold the carbon dioxide by cold adsorption to separate it from hydrogen, a suction device to absorb and convey hydrogen into corresponding first accumulation units, a desorption device to desorb carbon dioxide by the holding device, and a conveyor to convey carbon dioxide into corresponding second accumulation units.