Scrap tyre pyrolysis: Are the effluents valuable products?

12th International Symposium on Analytical and Applied Pyrolysis, UNIV VENICE, AULA MAGNA, VENICE, ITALY, OCT 14-18, 1996International audienceScrap tyre pyrolysis under nitrogen is studied at atmospheric pressure with the aim of producing a solid residue to be burned simultaneously with coal dust in a coal burning power plant. The experimental device maintains isothermal conditions. The temperatures of treatment are: 380, 450 and 550 degrees C. Three phases are obtained after pyrolysis: solid, liquid and gas and their composition is studied in relation to the temperature of the thermal treatment. The solid phase (char)-approximately 40% weight of the initial sample (steel free) mostly constituted of carbon, also contains the main mineral matter initially present in the used tyre. The char produced is brittle and has a high burning power which makes it suitable for burning when mixed with coal dust in coal burning power plants. The steel weave is easily separated from the solid carbon residue after the thermal treatment and recovered without physical or chemical change and can be recycled. The gas phase contains a mixture of light hydrocarbons, dihydrogen and carbon dioxide. The IRTF spectra of evolved gases shows a change in the ratio of every gas while the pyrolysis takes place. The liquid phase is a complex hydrocarbon mixture in which some components have been identified. The chemical-valorization of the liquid phase is an alternative to a thermal valorization. The pyrolysis appears to be a technique which is able to reduce a bulky, high polluting industrial waste, while producing energy and/or valuable chemical compounds

Vanini tra tormento umano e inquietudine religiosa

EnVanini's fame was initially generated by his informers who designed around him an aura of judgements and prejudices against his rational investigation aimed towards the infinite spaces of the liberty of philosophizing, sometimes representing him as an unrepentant heretic, sometimes as an unyielding atheist. Thus different images of the character result which are produced by the perception of time and by the dominant philosophies over the centuries. But man's effort to get out of a constrained space by the dogmatic gear, is perhaps a key to the reading more intimately related to his real life as a religious, philosopher and theologian, which can shed a light on the motive that pushed him to land towards those infinite spaces in an endeavour to overcome the obtuseness of its century.ItLa fama di Vanini è stata prodotta inizialmente dai suoi delatori, i quali hanno creato intorno a lui un'aura di giudizi e pregiudizi contro la sua indagine razionale diretta verso gli spazi infiniti della libertà del filosofare, disegnandolo ora come eretico impenitente, ora come ateo ostinato. Risultano così immagini difformi del personaggio prodotte dal sentire del tempo e dalle filosofie dominanti nel corso dei secoli. Ma lo sforzo dell'uomo di uscire da uno spazio costretto dell'ingranaggio dogmatico, è una chiave di lettura forse più aderente alla sua realtà di religioso, di filosofo e di teologo, che può chiarire il movente che lo ha spinto ad approdare verso quegli infiniti spazi nel tentativo di superare l'ottusità del suo secolo