Currently, the challenge of supplying energy needs efficiently and without causing irreparable damage to the environment has stimulated the search for alternative and renewable fuels. In this context, biomass is considered a material differentiated by being able to generate heat and energy directly by burning, as well as being used in the production of substitutes for petroleum products, as well as raw material for the chemical industry. In this work, the pyrolysis of açaí seed residues, eucalyptus and pine was studied in the production of different bio-oils, focusing on the yields and quality of the bio-oils generated. The pyrolysis technique aims to obtain products with higher energy density and better properties than the initial biomass. The yield and distribution of products during pyrolysis depends on parameters such as final temperature, heating rate, residence time, pressure used, biomass particle type and size, reactor type and process configuration [1]. To carry out the pyrolysis, the pine and eucalyptu were pyrolyzed with a particle size of approximately 5 x 5 x 2 mm and the açaí seeds was used as received. The residues of the three biomasses were pyrolyzed separately at a temperature of 450°C in an autoclave reactor with a nitrogen flow of 20 ml/min and a heating rate of 10°C/min. The main products obtained during the pyrolysis of the three biomasses were bio-oil (liquid), coal (solid) and a gaseous fraction. The liquid fractions obtained from the three biomasses are similar and are composed of a complex mixture of hydrocarbons, with the presence of oxygenates and aromatics. The main signs in the FTIR (FIG. 1) were the elongation of the O–H group (3300–3390 cm−1), oxygenated functional groups such as aldehydes, ketones, carboxylic acids C=O (1630–1710 cm−1) and aromatic bonds of C=C (1500–1600 cm−1) [2].
In the operational conditions used, the eucalyptus biomass presented the highest yield in liquid, reaching 65%, while the biomasses of pine and Açai seed presented yields of 58% and 55% in liquid product weight, respectively. The results also indicated the formation of 25 to 33% by weight of solid coal and 9 to 12% by weight of non-condensable gases. These results are in agreement with what has been reported in the literature [1,2].

1. BRIDGWATER, A. V. et al. Biomass and Bioenergy. v. 38, p. 68–94, 2012.
2. Li, H. et al. Energy Conversion and Management. v. 98, p. 81–88, 2015