Rheology of acid suspensions containing cassava bagasse: Effect of biomass loading, acid content and temperature

• Autor(a) principal: Polachini, Tiago Carregari [UNESP]
• Data de Publicação: 2019
• Outros Autores: Mulet, Antonio, Cárcel, Juan A., Telis-Romero, Javier [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.powtec.2019.05.086; http://hdl.handle.net/11449/189241
• topic: Apparent viscosity; Arrhenius-type equation; Herschel-Bulkley model; Lignocellulose; Residual starch; Shear-thinning

Understanding the characterization and rheological behavior of acid suspensions of cassava bagasse provides essential information for the design of conversion processes. Samples with different cassava bagasse concentrations (0–10% w∙w−1), phosphoric acid (0–10% w∙w−1) at temperatures between 278.13 and 318.13 K were submitted to steady-state flow over a wide range of shear rates (1–265 s−1). The biomass particles had considerable residual starch (~50% db), low lignin content and adequate particle size (<200 μm) for the conversion process. Flow curves were well-fitted to the Herschel-Bulkley model, presenting a Newtonian domain at low solids and acid content and a non-Newtonian behavior with noticeable yield stress and shear-thinning characteristic (n < 1) at above 6% of cassava bagasse. Resistance to flow increased as the solids loading and acid content increased. Temperature dependence could be expressed as a function of an Arrhenius-type equation with good accuracy of fit.