Kinetic of the Pyrolysis Process of Peach and Apricot Pits by TGA and DTGA Analysis

Abstract

The kinetic constant rate of the slow pyrolysis process has been estimated, at non-isothermal states, through TGA analysis (Thermogravimetry) for two typologies of biomass: peach and apricot pits. Thermal degradation was implemented using two heating rates (HR), 10 °C/min and 20 °C/min, with the aim of estimating the influence of such parameter on the process kinetics. Results, obtained through the Derivative Thermogravimetric Analysis (DTGA), illustrate that volatilization of both peaches and apricots starts at 200 °C and degradation mainly takes place in the temperature range 200-400 °C. At the end of the thermal degradation process (T = 600 °C), the amount of weight loss was 63÷73% and 58÷60% respectively for peach and apricot pits. It was found that the heating rate considerably influences the weight loss and kinetic constants. Higher heating rates provoke the shift of thermograms towards more elevated temperatures. The energy of activation of the pyrolysis process was calculated by the Friedman model and, for the HR of 10 C/min, it was discovered that this one is fairly independent by the range of conversion. Instead, for the HR of 20 °C/min, the energy of activation decreases, in average by 35%, while the conversion range rises.

Kenaf stems: Thermal characterization and conversion for biofuel and biochar production

“…A fixed carbon content of 15.1%wt is obtained indicating the yield of biochar during slow pyrolysis. Using these values, the calculation of the High heating value (HHV) gives 18.54 MJ/kg, which is in the order of magnitude of other biomasses HHV[28]. The Low Heating Values (LHV) are also determined.and Mg (1.75 g/kg) are the major minerals present in the Kenaf stems.…”

Development of Kenaf Biochar in Engineering and Agricultural Applications

“…In addition, the production of biochar due to slow pyrolysis suggesting a fixed carbon content of 15.80 wt%. From the study, the heating value (HHV) and low heating value (LHV) of the kenaf fibre is 18.54 MJ/kg and 17.38 MJ/kg, respectively, which is comparable to the HHV of other biomasses [ 23 , 37 ].

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Characteristics of Non-Polar Bio-oil Produced by Co-pyrolysis of Corn Cobs and Polypropylene using CO_2 as Carrier Gas

“…In this regime where PP compositions started to exceed biomass compositions in feeds, the heat radiation enhanced by CO 2 gas carrier worked with partial transparency of PP 20) . The high emissivity of CO 2 gas enhanced the primary and secondary pyrolysis of biomass where most of cellulose and hemicellulose decomposition occurred between 270 to 320 o C 21) and high mass decomposition of PP occurred above 400 o C 22) . These mass decomposition data indicate that biomass particles were still blanketed with PP melt when most of cellulose and hemicellulose were pyrolysed.…”