Biocarvão e bio-óleo de cascas de coco (Cocos nucifera L.) sob diferentes temperaturas de pirólise

Abstract

The processing and consumption of coconut, dry or green, generates large amounts of waste that are often poorly managed. However, with the increase in technology aimed at the use of biomass, coconut shell can be an important raw material for the production of biochar. The processing and consumption of coconut, dry or green, generates large amounts of waste that are often poorly managed. However, with the increase in technology aimed at the use of biomass, coconut shell can be an important raw material for the production of biochar. Biochar is a carbon-rich product, obtained after a controlled pyrolysis process and has several applications. Thus, the general objective of this work was to produce biochar from dry coconut shell and green Shell through controlled pyrolysis. The analyzes for the characterization of biocarbons were: moisture content; ash content; superior heating power; lower heating power; elementary analysis; cation exchange capacity (CTC), and; gravimetric yield. The moisture percentages of the biomasses were 12% and 8% for green and dry skin, respectively. The density of the green coconut shell has the highest value (242 Kg / m3). The levels of extractives found (29.05% and 10.30%) for green and dry skin corroborate those found in the literature, as well as the levels of lignin and cellulose, which were 30.75% and 41.79%; 24.37% and 29.68; for green and dry skin, respectively. For gravimetric yield in biochar, the dry bark, at 450 °, presented the highest value. The 450 ° green coconut biochar showed higher density. The ash content of biocarbons varied from 10 to 27%. The C / N ratio was high, between 67.3 and 83. Both coals produced had an effective CTC above 50.1; which influences positively. With the analyzes carried out, the biochar obtained from the dry shell at 450 ° proved to be the best among those produced.