Ultrapyrolysis of automobile shredder residue

A fast pyrolysis (Ultrapyrolysis) process was employed to convert automobile shredder residue (ASR) into chemical products. Experiments were conducted at atmospheric pressure and temperatures between 700 and 850°C with residence times between 0.3 and 1.4 seconds. Pyrolysis products included 59 to 68 mass% solid residue, 13 to 23 mass% pyrolysis gas (dry) and 4 to 12 mass% pyrolytic water from a feed containing 39 mass% organic matter and 2 mass% moisture. No measurable amounts of liquid pyrolysis oil were produced. The five most abundant pyrolysis gases, in vol%, were CO (18–29), CO2 (20–23), CH4 (17–22), C2H4 (20–22) and C3H6 (1–11), accounting for more than 90% of the total volume. The use of a higher organic content ASR feed (58 mass%) resulted in less solid residue and more pyrolysis gas. However, no significant changes were noted in the composition of the pyrolysis gas. On a utilise un procede de pyrolyse rapide (ultrapyrolyse) pour convertir les residus des dechiqueteuses d'automobiles (ASR) en produits chimiques. Des experiences ont ete menees a des pressions proches de la pression atmospherique et a des temperatures comprises entre 700 et 850°C, les temps de sejour variant de 0,3 a 1,4 secondes. Les produits de pyrolyse comprennent de 59 a 68% en masse de residus solides, de 13 a 23% en masse de gaz de pyrolyse (sec) et de 4 a 12% en masse d'eau pyrolytique, a partir d'une alimentation contenant 39% en masse de matiere organique et 2% en masse d'humidite. On n'a pas produit de quantites mesurables d'huile de pyrolyse liquide. Les cinq gaz de pyrolyse les plus abondants, en pourcentage volumique, sont le CO (18–29), le CO2 (20–23), le CH4 (17–22), le C2H4 (20–22) et le C3H6 (1–11), qui comptent pour plus de 90% du volume total. L'utilisation d'une alimentation en ASR a forte teneur organique (58% en masse) donne moins de residus solides et davantage de gaz pyrolitique. Cependant, aucun changement significatif n'est note dans la composition du gaz de pyrolyse.

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