Thermal degradation of rice-bran with high density polyethylene: A kinetic study

Abstract

Thermal degradation behavior of mixtures of rice bran (RB) and high density polyethylene (HDPE) was investigated by thermo-gravimetric analyses (TGA) under dynamic conditions in nitrogen atmosphere and was compared with that of individual materials. Experiments were carried out in the range of ambient temperature to 900 o C at two heating rates (5 and 20 o C per minute). Kinetic analysis indicated that activation energy for pyrolysis of RB, HDPE and those for RB-HDPE mixtures varied with rate of heating as well as with the three temperature ranges. This variation has been explained on the materials' decomposition behavior. Maximum difference between experimental and theoretical mass loss (∆m) was 26% at 475 o C and 34% at 489 o C at the heating rates of 5 and 20 o C per minute, respectively. These maxima indicate stronger interactions at corresponding temperature between RB and HDPE during copyrolysis. Reduction in activation energy for pyrolysis, lower temperatures at which rate of decomposition is highest, and negligible quantity of the residue suggest a synergism between thermal degradation of RB and HDPE.

Kinetic study for the co-pyrolysis of lignocellulosic biomass and plastics using the distributed activation energy model

“…Several studies on co-pyrolysis have been developed to examine the thermal behaviour and decomposition kinetics of organic and plastic blends using thermogravimetric analysis. Interactions between biomass and plastics have been studied by comparison of experimental and theoretical mass loss calculated assuming additive effect of pure materials [13,[16][17][18][19][20][21][22][23][24][25][26]. The kinetic parameters of pure components and their mixtures have also been compared to study interactions between biomass and plastics.…”

“…The kinetic parameters of pure components and their mixtures have also been compared to study interactions between biomass and plastics. The kinetic parameters were calculated either by dividing the mixture into main degradation regions for each material [13,[20][21][22][23][24][25][26][27][28] or by applying the isoconversional method [19,29,30]. Narobe et al [30] concluded with the isoconversional method that the activation energy (E a ) parameter did not have a constant value throughout the whole process of thermal decomposition.…”

Influence of the Design Solutions of Extruder Screw Mixing Tip on Selected Properties of Wheat Bran-Polyethylene Biocomposite

“…In the 3D FTIR spectrum of gases emitted during the decomposition of the extrudates (Figure 21), only absorption bands from carbon dioxide and water are observed, and the decomposition of composites takes place in a wider temperature range in comparison with individual components. This is caused on the one hand by the slower diffusion of heat into the sample, especially at higher temperatures, and on the other hand by hindered diffusion from the sample interior of the produced gaseous decomposition products [90]. Figure 20.…”

Thermal Behavior and Kinetic Analysis of Enzymatic Hydrolysis Lignin and High-Density Polyethylene during Co-Pyrolysis

“…Kinetic analysis is essential to reveal the synergistic effect during co-pyrolysis and to better understand the thermal conversion mechanism. Moreover, the kinetic parameters can accurately predict the optimum conditions for the co-pyrolysis process to produce the desired products and design the thermochemical processes for fuel and chemical production (Mui et al 2010;Rotliwala and Parikh 2011). Various methods have been applied to determine the kinetic parameters from the thermogravimetric (TG) data.…”