Pirólise rápida de coprodutos do processo produtivo do biodiesel: efeito das condições de pirólise e caracterização dos produtos

Abstract

In this work we studied the thermal conversion of the tucumã (TU), murumuru (MU) and castor bean (MA) cakes as a use alternative for the solid residues from the biodiesel production process. The biomasses were characterized by different methodologies, to the adequacy of its characteristics in the conversion process. The thermal decomposition kinetics of the cakes was studied from dynamic assays and the kinetic parameters were calculated using the models called model-free methods. In the method of Kissinger, kinetic parameters were the same during the whole process, whereas the methods of FWO and KAS presented different values for the Ea and A of each conversion and showed a complex mechanism for reactions that occur during pyrolysis. The thermal conversion was conducted in a fluidized bed reactor in a fast pyrolysis regime. The temperature, particle size and N2 flow effects were studied. Under the best processing conditions of the materials: temperature 400°C for TU, 400°C for MU and 500°C for MA, particle size between 0.36 and 0.43mm for TU, 0.25 and 0.36 mm for MU and 0.25 and 0.36mm for MA and N2 flows of 500, 1000 and 500cm3min-1 for TU, MU and MA respectively, the highest amount of liquid products obtained was from 41.96% for TU, 62.09% for MU and 45.48% for the MA. However, the solid and gas yields were 32.76% and 25.27% respectively for TU, 26.06% and 11.85% for MU and 37.43% and 17.09% for MA. The liquid and solid wastes were subjected to various characterization tests and evidenced to be future sources of raw materials and chemical inputs