Determination of kinetic parameters of thermal degradation of palm oil mill by-products using thermo gravimetric analysis and differential scanning calorimetry
Publicación:
Revista Palmas; Vol. 29 Núm. 4 (2008); 31-46
0121-2923
Revista Palmas; Vol. 29 Núm. 4 (2008); 31-46
0121-2923
Abstract
Empty fruit bunches (EFB), fiber, and shell are the main solid residues produced during extraction of oil from oil palm (Elaeis guineensis Jacq.). Thermo gravimetric (TG) and differential scanning calorimetric (DSC) analyses of these materials were carried out on samples as received and after solvent extraction. Presence of extractives and ash had a strong effect on the thermal behavior of EFB. Observed thermal degradation behavior was described using two analytical approaches. The first approach considered that biomass thermal degradation occurs in three consecutive steps, while the second approach used three independent reactions as the model. The shapes of the TG and DSC curves were used to identify the degradation steps. The thermal degradation activation energy (E) and pre-exponential factor (A) obtained by both approaches were very similar. Los principales residuos sólidos producidos durante la extracción de aceite de la palma de aceite (Elaeis guineensis Jacq.) son los racimos vacíos de fruta o tusas, fibras y cuesco. Se realizaron análisis termogravimétrico (TG) y calorimétrico diferencial de barrido (CDB) de estos materiales en muestras tal como se recibieron y luego de la extracción con disolvente. La presencia de extractivos y cenizas tuvo un importante efecto en el comportamiento térmico de la tusa. El comportamiento de degradación térmica observado se describió mediante dos métodos analíticos. El primero consideró tres pasos consecutivos para la degradación térmica de la biomasa, mientras que el segundo método empleó tres reacciones independientes como modelo. Las formas de las curvas TG y CDB se usaron para identificar los pasos de degradación. La energía de activación (E) de la degradación térmica y el factor pre-exponencial (A) obtenidos mediante ambos métodos fueron muy similares.
Empty fruit bunches (EFB), fiber, and shell are the main solid residues produced during extraction of oil from oil palm (Elaeis guineensis Jacq.). Thermo gravimetric (TG) and differential scanning calorimetric (DSC) analyses of these materials were carried out on samples as received and after solvent extraction. Presence of extractives and ash had a strong effect on the thermal behavior of EFB. Observed thermal degradation behavior was described using two analytical approaches. The first approach considered that biomass thermal degradation occurs in three consecutive steps, while the second approach used three independent reactions as the model. The shapes of the TG and DSC curves were used to identify the degradation steps. The thermal degradation activation energy (E) and pre-exponential factor (A) obtained by both approaches were very similar.
Palabras clave:
aceite de palma
extracción
análisis térmico
técnicas analíticas
biomasa
calorimetría
aceite de palma
extracción
análisis térmico
técnicas analíticas
biomasa
calorimetría