Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

Conesa, Juan A.; Sánchez, Nazly E.; Garrido, María A.; Casas, Juan Carlos

doi:10.1021/acs.energyfuels.6b00791

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…For example, the decomposition of coffee husks [39] can only be explained if three different fractions are considered. Figure 7 shows the fitting obtained using the runs performed at 5, 10 and 20 K/min.…”

Section: Simulations and Application To Some Materialsmentioning

confidence: 99%

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Conesa

2021

Thermo

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Research abounds in the literature on kinetic analyses using thermogravimetric (TG) runs. Many of these studies use approximations of integral or derivative forms of the kinetic law and all of them use programmed temperatures. In the present work, a numerical integration procedure was discussed and applied to different examples. We focused on materials presenting a single decomposition curve as well as other materials with more complex processes. Different examples were explored, and the methodology was applied to a number of wastes such as coffee husks, polystyrene and polyethylene. In all cases, the actual temperature measured by thermocouples close to the sample is used, and several runs are fitted using the same kinetic parameters, giving robustness to the results.

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Section: Simulations and Application To Some Materialsmentioning

confidence: 99%

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Conesa

2021

Thermo

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“…For example, the decomposition of coffee husks [41] can only be explained if three different fractions are considered. Figure 7 shows the fitting obtained using the runs performed at 5, 10 and 20 K/min.…”

Section: Simulations and Application To Some Materialsmentioning

confidence: 99%

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Conesa¹

2021

Preprint

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Research abounds in the literature on kinetic analyses using thermogravimetric (TG) runs. Many of these studies use approximations of integral or derivative forms of the kinetic law and all of them use programmed temperature, not the actual temperature measured by thermocouples close to the sample. In addition, it is common to conduct a single run in order to perform the calculation. Nevertheless, many authors consider that numerical methods should be used to analyse the kinetics of decomposition. In such cases, the actual temperature is used and, generally, several runs are fitted using the same kinetic parameters, giving robustness to the results. In the present work, a numerical integration procedure was discussed and applied to different examples. We focused on materials presenting a single decomposition curve as well as other materials with more complex processes. Different examples were explored, and the methodology was applied to a number of wastes such as coffee husks, polystyrene and polyethylene.

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“…On the other hand, one of the wastes generated in large quantities during the process of the coffee bean transformation is the coffee husk. This material represents 4.5% of the grain composition, and about 33.000 tons/year is produced in Colombia [9]. The proposed uses for this waste are fermentation in order to obtain enzymes, organic acids, or bioethanol.…”

Section: Introductionmentioning

confidence: 99%

Recycled Polypropylene-Coffee Husk and Coir Coconut Biocomposites: Morphological, Mechanical, Thermal and Environmental Studies

Hidalgo-Salazar¹,

Correa-Aguirre²,

Montalvo-Navarrete³

et al. 2020

Thermosoftening Plastics

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In this work, biocomposites based on recycled polypropylene (r-PP) and two different natural fibers (coffee husk-CHF and coconut coir-CCF fibers) were prepared using extrusion and injection molding processes. Also, the addition of maleated polypropylene (MAPP) as a coupling agent on the biocomposites was explored. Recycled polypropylene and its biocomposites were tested following ASTM standards in order to evaluate tensile and flexural mechanical properties. Also, thermal behavior and the morphology of these materials have been studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electronic microscopy (SEM). The experimental results showed that the addition of CHF and CCF to the r-PP resulted in an increase in the flexural modulus and thermal properties of the composites but resulted in poor impact properties. Thermal characterization showed that CHF possesses a better thermal stability compared to CCF. However, both fibers act as nucleating agents and generate an increase in the thermal stability of the r-PP phase. Finally, it was observed that addition of 4% of MAPP significantly improved the mechanical strength and impact behavior of the biocomposites. Regarding environmental issues, a cradle to gate life cycle assessment was made in order to define the carbon footprint of the materials.

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Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

Cited by 9 publications

References 32 publications

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Recycled Polypropylene-Coffee Husk and Coir Coconut Biocomposites: Morphological, Mechanical, Thermal and Environmental Studies

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