| Abstrakt: |
Despite the importance of the bio-oil collection system for pyrolysis, this component is little discussed in the literature, mainly when it involves the adherence of the bio-oil and the separation of chemical species. In this study, we present a collection system that simultaneously reduces the bio-oil adhesion to the walls of the equipment and separates phenolic species from the bio-oil while the biomass is pyrolyzed. The collection system is formed by four condensers and five waterbeds in series. The biomass used was the sisal residue, whose pyrolysis produces one of the bio-oils with the highest viscosity. Adherence was initially studied in a prototype by varying the mass flow rate of biomass, the volumetric flow rate of nitrogen, reaction temperature, and the insertion site of the waterbed. We identified that bio-oil adhesion on the equipment walls was reduced when the independent variable values were the lowest; however, approximately 50% of the fluid adhered to the equipment walls. The fluid adhesion reduction was obtained by eliminating high-pressure points in the pyrolysis gas flow, increasing the bio-oil produced in the waterbeds to 93%. The chemical species were separated in the waterbeds by bubbling the pyrolysis gas, producing agglomerates of bio-oil on the liquid surface and chemical species in solution. FTIR and GC/MS were used to characterize the bio-oils and aqueous solutions for the products formed in higher yields. The analyses show a high transfer of phenolic species to the aqueous phase, mainly in the first waterbed, and that the bio-oil composition was similar in all beds, showing no separation signs. These results showed that the system studied is a viable alternative to the bio-oil collection of different characteristics, ensuring little internal fluid adhesion and a high ability to separate chemical species. [ABSTRACT FROM AUTHOR] |
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