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Abstract
In the present paper, the results obtained in the pyrolysis of four industrial waste oils (automotive, hydraulic, machine and cutting oil) are shown. The pyrolysis has been carried out at atmospheric pressure and 600°C. The continuous injection of the samples was into the bottom part of the reactor using a pump. Liquid and gases fractions have been analysed, organic products by gas chromatography and metals concentration by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The gases obtained are mainly formed by methane and light olefins, C 2– C 4, and the liquids contain an aromatic fraction of high industrial value. The behaviour of metals was also very different from one oil to another. Lead was the most affected metal in all of them, with a decrease ratio (concentration before and after the pyrolysis) from 165 for machine oil to 32 for the hydraulic oil. Pb, Cr, Cu, Ni, Pb and V were identified and quantified in each fraction. The results show that the automotive and machine waste oils are the better ones concerning the liquid yields. However, the hydraulic and cutting oils show a high conversion to gas products. The relationship between the type of waste oil and the products obtained is discussed.
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