Search results for "Hydrothermal carbonization"

showing 3 items of 3 documents

Biomass Waste Processing into Artificial Humic Substances

2021

Abstract To address the biomass waste processing problem and transform it into refractory forms of carbon, recently suggested hydrothermal carbonization (HTC) of biomass in alkaline environment can be considered as a prospective and climate neutral approach. Biomass HTC provides possibilities to obtain form of biochar (hydrochar) and artificial humic substances, however the conditions of the HTC have not been much studied. Optimization by Response Surface Methodology of the HTC using microwave treatment with three experimental variables (treatment temperature, length of microwave treatment, amount of biomass per volume) provides the possibility to significantly increase the yield of humic s…

humic substancesRenewable Energy Sustainability and the EnvironmentChemistrybiomass wasteTJ807-830BiomassPulp and paper industrycomplex mixturesdigestive system diseasesRenewable energy sourceshydrothermal carbonizationartificial humic acidsGeneral Environmental ScienceWaste processingEnvironmental and Climate Technologies
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Mechanisms of Water Interaction with Pore Systems of Hydrochar and Pyrochar from Poplar Forestry Waste

2014

The aim of this study was to understand the water-surface interactions of two chars obtained by gasification (pyrochar) and hydrothermal carbonization (hydrochar) of a poplar biomass. The two samples revealed different chemical compositions as evidenced by solid state (13)C NMR spectroscopy. In fact, hydrochar resulted in a lignin-like material still containing oxygenated functionalities. Pyrochar was a polyaromatic system in which no heteronuclei were detected. After saturation with water, hydrochar and pyrochar were analyzed by fast field cycling (FFC) NMR relaxometry. Results showed that water movement in hydrochar was mainly confined in very small pores. Conversely, water movement in py…

Magnetic Resonance SpectroscopyWater flowSettore AGR/13 - Chimica Agraria1600 General Chemistry1100 General Agricultural and Biological SciencesHydrothermal carbonizationAdsorptionBiocharmedicine910 Geography & travelPorosityWaste ProductsChemistryTemperatureWaterForestryGeneral Chemistry10122 Institute of GeographyPopulusAgronomyChemical engineeringCharcoalGeneral Agricultural and Biological SciencesPorous mediumSaturation (chemistry)Porosityfast field cycling NMR relaxometry hydrochar pyrochar biochar water dynamicsActivated carbonmedicine.drug
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Reactivity of cellulose during hydrothermal carbonization of lignocellulosic biomass

2020

Abstract Hydrothermal carbonization (HTC) of pure cellulose (CE) and birchwood (BW) samples was carried out at temperatures between 160 and 280 °C, 0.5 h residence time and biomass-to-water ratio 1:5, to investigate the reactivity of cellulose in lignocellulosic biomass. Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) showed that the CE samples remained unaltered at temperatures up to 220 °C, but were significantly decomposed at 230 °C producing a thermal recalcitrant aromatic and high energy-dense material. FTIR showed that dehydration and aromatization reactions occurred at temperature equal or higher than 230 °C for the CE samples while a similar incre…

Thermogravimetric analysis020209 energyGeneral Chemical EngineeringEnergy Engineering and Power TechnologyLignocellulosic biomass02 engineering and technologyHydrothermal carbonizationBirchwoodchemistry.chemical_compoundHydrothermal carbonization020401 chemical engineeringSettore BIO/13 - Biologia Applicata0202 electrical engineering electronic engineering information engineeringSolid biofuelLignin0204 chemical engineeringCelluloseFourier transform infrared spectroscopyAromatizationAcid hydrolysiCellulose reactivityFuel TechnologychemistryAcid hydrolysisNuclear chemistrySettore AGR/16 - Microbiologia Agraria
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