Stepwise isothermal fast pyrolysis (SIFP) of biomass. Part III. SIFP of olive oil industry wastes

Abstract

Pyrolysis of olive oil industry wastes was carried out using stepwise isothermal fast pyrolysis (SIFP). SIFP consists of successive isothermal fast pyrolysis reactions, where solid products obtained in the previous isothermal fast pyrolysis become the substrate of the subsequent reaction at a higher temperature. This article reports results obtained from SIFP of olive oil residues between 300 and 500°C using 100°C intervals under reduced pressure (200 mm). Maximum yield of liquid products occurs at 300°C giving around 35 % of bio oil which contains mainly phenols, furan and fatty acids methyl esters (FAME). At 400 and 500 °C, FAME, derived from residual olive oil becomes the major product.