Análise Do Processo De Pirólise De Sementes De Açaí (Euterpe Oleracea, Mart): Influência Da Temperatura No Rendimento Dos Produtos De Reação E Nas Propriedades Físico-Químicas Do Bio-Óleo / Process Analysis of Pyrolise of Açaí (Euterpe Oleracea, Mart) Seeds: Influence of Temperature on the Yield of Reaction Products and Physico-Chemical Properties of Bio-Oil

Serrão, Alisson Caio Magalhães; Silva, Conceição Maria Sales; Assunção, Fernanda Paula da Costa; Ribeiro, Haroldo Jorge da Silva; Santos, Marcelo Costa; Almeida, Hélio da Silva; Duvoisin, Sérgio; Borges, Luiz Eduardo Pizarro; Castro, Douglas Alberto Rocha de; Machado, Nélio Teixeira

doi:10.34117/bjdv7n2-453

Cited by 7 publications

(12 citation statements)

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“…This is because at the beginning of reaction, the primary cracking occurs, forming oxygenated compounds [14][15][16]18]. Then, in the middle to the end of the reaction, secondary cracking occurs by de-carbonylation and de-carboxylation reactions, producing hydrocarbons [14][15][16]18,[30][31][32][33][34][35][36][37], and hydrocarbons have superior physicochemical properties than oxygenates, that is, lowers density, lower kinematic viscosity and lower acidity. Table 4.…”

Section: Effect Of Reaction Time On the Physicochemical Properties Of...mentioning

confidence: 99%

“…The kinematic viscosity of bio-oils decreases because at the beginning of the catalytic cracking reaction, the primary cracking occurs, forming oxygenated compounds [19][20][21]23]. Then, in the middle to the end of the reaction, secondary cracking occurs by de-carbonylation and de-carboxylation, producing hydrocarbons [19][20][21]23,[30][31][32][33][34][35][36][37], and hydrocarbons have much lower viscosity than oxygenates. The influence of reaction time on the density of bio-oil by catalytic upgrading of residual fat pyrolysis vapors at 450 • C, 1.0 atm, 0.0%, 5.0%, 7.5%, and 10.0% (wt.)…”

Section: Effect Of Reaction Time On the Viscosity Of Bio-oilmentioning

confidence: 99%

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Catalytic Upgrading of Residual Fat Pyrolysis Vapors over Activated Carbon Pellets into Hydrocarbons-like Fuels in a Two-Stage Reactor: Analysis of Hydrocarbons Composition and Physical-Chemistry Properties

et al. 2022

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This work investigated the influence of the reaction time and catalyst-to-residual fat ratio by catalytic upgrading from pyrolysis vapors of residual fat at 400 °C and 1.0 atmosphere, on the yields of reaction products, physicochemical properties (density, kinematic viscosity, and acid value) and chemical composition of bio-oils, over a catalyst fixed-bed reactor of activated carbon pellets impregnated with 10.0 M NaOH, in semi-pilot scale. The experiments were carried out at 400 °C and 1.0 atmosphere, using a process schema consisting of a thermal cracking reactor of 2.0 L coupled to a catalyst fixed-bed reactor of 53 mL, without catalyst and using 5.0%, 7.5%, and 10.0% (wt.) activated carbon pellets impregnated with 10.0 M NaOH, in batch mode. Results show yields of bio-oil decreasing with increasing catalyst-to-tallow ratio. The GC-MS of liquid reaction products identified the presence of hydrocarbons (alkanes, alkenes, ring-containing alkanes, ring-containing alkenes, and aromatics) and oxygenates (carboxylic acids, ketones, esters, alcohols, and aldehydes). For all the pyrolysis and catalytic cracking experiments, the hydrocarbon selectivity in bio-oil increases with increasing reaction time, while those of oxygenates decrease, reaching concentrations of hydrocarbons up to 95.35% (area).

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Section: Effect Of Reaction Time On the Physicochemical Properties Of...mentioning

confidence: 99%

Section: Effect Of Reaction Time On the Viscosity Of Bio-oilmentioning

confidence: 99%

Catalytic Upgrading of Residual Fat Pyrolysis Vapors over Activated Carbon Pellets into Hydrocarbons-like Fuels in a Two-Stage Reactor: Analysis of Hydrocarbons Composition and Physical-Chemistry Properties

et al. 2022

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“…The weight loss of hydro-chars obtained by hydrothermal processing of corn stover at 175, 200, 225, and 250 • C, 240 min, and biomass/H 2 O proportion of 1:10, using a reactor of 18.927 L, was analyzed by TG/DTG/DTA, and the equipment and procedures were described elsewhere [57].…”

Section: Thermo-gravimetric Analysis (Tg/dtg/dta)mentioning

confidence: 99%

“…At 200 • C, X-ray-diffraction data identified two crystalline phases-crystalline cellulose with a peak of higher intensity (100%) on the positions 2θ: 20.68, 15.53 (79%), and 21.96 (90.07%), because of amorphous cellulose matrix degradation and the exposure of the crystalline cellulose [57], and graphite (C) with a peak of medium intensity (59.38%) on the position 2θ: 26.45, as shown in Figure 7b. The XRD at 225 • C identified two crystalline phases-graphite (C) with a peak of medium intensity (53.75%) on the position 2θ: 26.57, and crystalline cellulose with peaks of high and low intensity on the positions 2θ: 22.47 (100%) and 49.94 (49.86%), as well as three peaks of medium and low intensity on the positions 2θ: 20.73 (65.99%) and 49.94 (49.86%), as shown in Figure 8a.…”

Section: Edx Analysismentioning

confidence: 99%

Characterization of Bio-Adsorbents Produced by Hydrothermal Carbonization of Corn Stover: Application on the Adsorption of Acetic Acid from Aqueous Solutions

et al. 2021

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In this work, the influence of temperature on textural, morphological, and crystalline characterization of bio-adsorbents produced by hydrothermal carbonization (HTC) of corn stover was systematically investigated. HTC was conducted at 175, 200, 225, and 250 °C, 240 min, heating rate of 2.0 °C/min, and biomass-to-H2O proportion of 1:10, using a reactor of 18.927 L. The textural, morphological, crystalline, and elemental characterization of hydro-chars was analyzed by TG/DTG/DTA, SEM, EDX, XRD, BET, and elemental analysis. With increasing process temperature, the carbon content increased and that of oxygen and hydrogen diminished, as indicated by elemental analysis (C, N, H, and S). TG/DTG analysis showed that higher temperatures favor the thermal stability of hydro-chars. The hydro-char obtained at 250 °C presented the highest thermal stability. SEM images of hydro-chars obtained at 175 and 200 °C indicated a rigid and well-organized fiber structure, demonstrating that temperature had almost no effect on the biomass structure. On the other hand, SEM images of hydro-chars obtained at 225 and 250 °C indicated that hydro-char structure consists of agglomerated micro-spheres and heterogeneous structures with nonuniform geometry (fragmentation), indicating that cellulose and hemi-cellulose were decomposed. EDX analysis showed that carbon content of hydro-chars increases and that of oxygen diminish, as process temperature increases. The diffractograms (XRD) identified the occurrence of peaks of higher intensity of graphite (C) as the temperature increased, as well as a decrease of peaks intensity for crystalline cellulose, demonstrating that higher temperatures favor the formation of crystalline-phase graphite (C). The BET analysis showed 4.35 m2/g surface area, pore volume of 0.0186 cm3/g, and average pore width of 17.08 μm. The solid phase product (bio-adsorbent) obtained by hydrothermal processing of corn stover at 250 °C, 240 min, and biomass/H2O proportion of 1:10, was activated chemically with 2.0 M NaOH and 2.0 M HCl solutions to investigate the adsorption of CH3COOH. The influence of initial acetic acid concentrations (1.0, 2.0, 3.0, and 4.0 mg/mL) was investigated. The kinetics of adsorption were investigated at different times (30, 60, 120, 240, 480, and 960 s). The adsorption isotherms showed that chemically activated hydro-chars were able to recover acetic acid from aqueous solutions. In addition, activation of hydro-char with NaOH was more effective than that with HCl.

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“…al. [43], who studied the pyrolysis of Açaí seeds in nature at 350, 400, and 450 °C, 1.0 atmosphere, in pilot scale, showing yields between 2.0 and 4.39% (wt. ), as well as those reported by Castro et.…”

Section: Mass Balances By Pyrolysis Of Açaí Seedsmentioning

confidence: 99%

Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-treatment

Daniel¹,

Valois²,

Bremer³

et al. 2023

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This work investigated the effect of temperature and acid or alkalis chemical activation by pyrolysis of Açaí seeds (Euterpe Oleraceae, Mart.) on the yield of bio-oil, hydrocarbon content of bio-oil, and chemical composition of aqueous phase. The experiments were carried out at 350, 400, and 450 °C and 1.0 atmosphere, KOH and HCl activation, in laboratory scale. The acidity of bio-oils and aqueous phases determined by AOCS methods, while the chemical composition of bio-oils and aqueous phase by GC-MS and FT-IR. The bio-char characterized by XRD. For the activation with KOH, the XRD analysis identified the presence of Kalicinite (KHCO3), the dominant crystalline phase in bio-char, while an amorphous phase was identified in bio-chars for the activation with HCl. The yield of bio-oil, for the pyrolysis of Açaí seeds activated with KOH, varied between 3.19 and 6.79 (wt.%), showing a smooth exponential increase with temperature. The acidity of bio-oil varied between 12.3 and 257.6 mgKOH/g, decreasing exponentially with temperature, while the acidity of aqueous phase lies between 17.9 and 118.9 mgKOH/g, showing and exponential decay behavior with temperature, demonstrating that higher temperatures favor not only the yield of bio-oil but also bio-oils with lower acidity. For the pyrolysis experiments activated with HCl, the yield of bio-oil varied between 2.13 and 3.37 (wt.%), decreasing linearly with temperature, while that of gas phase varied between 17.91 and 37.94 (wt.%), increasing linearly with temperature. The acidity of bio-oil varied between 127.1 and 218.5 mgKOH/g, increasing with temperature, showing that higher temperatures did not favor the yield of bio-oil and bio-oils acidity. For the chemical activation with KOH, the FT-IR analysis of bio-oils identified the presence of chemical groups characteristics of hydrocarbons and oxygenates, while that of aqueous phase only groups characteristics of oxygenates. For the chemical activation with HCl, the FT-IR analysis of bio-oil and aqueous phases identified only the presence of groups characteristics of oxygenates. For the experiments with KOH activation, the GC-MS of bio-oil identified the presence of hydrocarbons (alkanes, alkenes, cycloalkanes, cycloalkenes, and aromatics) and oxygenates (carboxylic acids, phenols, ketones, and esters). The concentration of hydrocarbons varied between 10.19 to 25.71 (area.%), increasing with temperature, while that of oxygenates from 52.69 to 72.15 (area.%), decreasing with temperature. For the experiments with HCl activation, the GC-MS of bio-oil identified only the presence of oxygenates. Finally, it can be concluded that chemical activation of Açaí seeds with KOH favors the not only the yield of bio-oil but also the content of hydrocarbons while activation with HCl produced bio-oils with only oxygen compounds.

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Cited by 7 publications

References 11 publications

Catalytic Upgrading of Residual Fat Pyrolysis Vapors over Activated Carbon Pellets into Hydrocarbons-like Fuels in a Two-Stage Reactor: Analysis of Hydrocarbons Composition and Physical-Chemistry Properties

Catalytic Upgrading of Residual Fat Pyrolysis Vapors over Activated Carbon Pellets into Hydrocarbons-like Fuels in a Two-Stage Reactor: Analysis of Hydrocarbons Composition and Physical-Chemistry Properties

Characterization of Bio-Adsorbents Produced by Hydrothermal Carbonization of Corn Stover: Application on the Adsorption of Acetic Acid from Aqueous Solutions

Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-treatment

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