Pyrolysis of orange waste: A thermo-kinetic study

Lopez-Velazquez, M.A.; Santes, Vı́ctor; Balmaseda, J.; Torres-Garcı́a, E.

doi:10.1016/j.jaap.2012.09.016

Cited by 249 publications

(118 citation statements)

References 47 publications

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“…Probably, this is an indication of the inadequacy of the kinetic chemical models as the thermal decomposition process is not entirely a chemical-based reaction. The correlation coefficients obtained for the methods were fairly high, which attests to the reliability of the models [25]. Generally, the trends of the apparent activation energy for both methods and samples are fairly comparable; reaching a peak of 171.78 and 187.73 kJ mol respectively for Friedman's and Starink's.The apparent activation energy obtained for both methods were within the range reported for biomass residues [36,40].…”

Section: Tga and Kinetic Datasupporting

confidence: 57%

“…The TGA data is valuable in developing mathematical models that can predict the decomposition mechanisms of the respective polymeric fractions. Balogun et al [24], Lopez-Velaquez et al [25] and Burhenne et al [26] have all developed mathematical models from TGA data, which were subsequently used in evaluating the kinetic parameters for some biomass materials.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-kinetic, spectroscopic study of brewer’s spent grains and characterisation of their pyrolysis products

Balogun

Sotoudehniakarani

McDonald

2017

Journal of Analytical and Applied Pyrolysis

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A B S T R A C TBrewer's spent grains, major by-products of the beverage industries, were obtained from a Nigerian brewery and subjected to pyrolysis at 500°C. Analytical pyrolysis (Py-GC/MS) was conducted on the original BSG, extractivefree BSG and BSG CH 2 Cl 2 extract. There was a marked difference in the concentration of levoglucosan between the extractive-free BSG (40.5%) and the original BSG (11.5%). The Py-GC/MS detected significant amount of palmitic and oleic acids in the three samples. Prior to pyrolysis, the extractives content were isolated through methanolysis, transesterified and subjected to GC/MS analysis. The analysis revealed the presence of linoleic, oleic and palmitic acids in an appreciable quantity. The BSG and its biochar were also characterised according to Fourier transform infrared and Raman spectroscopic, and thermogravimetric analyses alongside some conventional physico-chemical analysis. The total crystallinity and condensation indices were evaluated from specific FTIR spectra peaks so as to monitor structural transformations in the bio-char. Kinetic data were deduced from TGA measurements and it was apparent that thermal decomposition of BSG is better modelled as a multi-step reaction mechanism. The nitrogen content of the bio-char was relatively high making it a suitable feedstock for the production of in situ nitrogenised activated bio-carbon. There was a significant variation between the structural configuration of the original BSG and the bio-char as revealed by the change in the value of the condensation index as well as the cellulose crystallinity content. It may thus be concluded that the BSG biomass would be a viable feedstock for thermal decomposition and other valorisation processes.

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Section: Tga and Kinetic Datasupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Thermo-kinetic, spectroscopic study of brewer’s spent grains and characterisation of their pyrolysis products

Balogun

Sotoudehniakarani

McDonald

2017

Journal of Analytical and Applied Pyrolysis

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“…The endothermic decomposition of pectin may be largely counter balanced by the exothermic depolymerization of hemicelluloses [26]. As shown in [45], in temperature range of 220-375°C, lignin is partially decomposed. The determined mass loss for these temperature range corresponding two peaks was about 59.7% in air and 24.9% in nitrogen atmosphere.…”

Section: Referential Hemp Hurds (Rhh)mentioning

confidence: 99%

Thermal degradation of natural and treated hemp hurds under air and nitrogen atmosphere

Števulová

Estokova

Cigasova

et al. 2016

J Therm Anal Calorim

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Sustainability goals are essential driving principles for the development of innovative materials in the construction industry. Natural fibers represent an attractive alternative as reinforcing material due to good mechanical properties and sustainability prerequisites. The study has been focused on the comparative investigation of chemical and physical treatments of hemp hurds and their influence on the thermal behavior of main hemp constituents in air and nitrogen atmosphere. Thermal decomposition of hemp hurds involves several parallel reactions related to heat and mass transfer processes. A comparison of DSC and TG/ DTG results of hemp hurds samples before and after treatments demonstrates a better thermal stability for treated samples. It is caused by changes in chemical composition due to a partial removal of non-cellulosic components from hemp hurds structure, an increase in cellulose content and decrease in its degree of polymerization. The results show different thermal behavior of the hurds samples heated under nitrogen and air atmosphere. Based on DTG records, several-stage process of mass loss has been found for the samples under air, whereas only two-stage process under nitrogen.

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“…Several authors [18][19][20] recently studied pyrolysis and gasification of citrus peel wastes and their potential use as bio-fuel for electrical and thermal energy production. As per other similar agro industrial waste, in order to be efficiently used as a bio-fuel, feedstock require treatments aimed at increasing their stability and energy density as well as lowering the hydrophilicity and their oxy- 50 30 250 N2 50 30 300 N2 50 30 LP/OP 325 N2 50 30 400 He 50 30 500 He 50 30 650 He 50 30 gen content.…”

Section: Introductionmentioning

confidence: 99%