Análise Da Composição Química Do Bio-Óleo Produzido via Pirólise De Sementes De Açaí (Euterpe Oleracea, Mart) / Chemical Analysis of Bio-Oil Produced by Pyrolise of Açaí (Euterpe Oleracea, Mart) Seeds

Sousa, Jordy Lima de; Guerreiro, Lauro Henrique Hamoy; Bernar, Lucas Pinto; Ribeiro, Haroldo Jorge da Silva; Oliveira, Rafael Lopes e; Santos, Marcelo Costa; Almeida, Hélio da Silva; Duvoisin, Sérgio; Borges, Luiz Eduardo Pizarro; Castro, Douglas Alberto Rocha de; Machado, Nélio Teixeira

doi:10.34117/bjdv7n2-261

Cited by 2 publications

(6 citation statements)

References 7 publications

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“…These results were effectively modeled using a first-order exponential growth model, with an r 2 value of 1.00 for both categories. These findings align with the research conducted by de Sousa et al [32], who investigated the influence of process temperature on the concentration of hydrocarbons and oxygenates in bio-oil derived from açaí seeds using a pilot-scale pyrolysis setup. Their study, which examined temperatures of 350, 400, and 450 • C under a pressure of 1.0 atm, demonstrated that the concentration of hydrocarbons increased while the concentration of oxygenates decreased with rising temperature.…”

Section: Process Analysis 211 Effect Of Process Temperaturesupporting

confidence: 91%

“…The concentrations of phenols, esters, and ketones decrease with increasing pyrolysis temperature, showing a smooth exponential decay behavior, as shown in Figure 3. The results are according to those reported by de Sousa et al [32]. The concentration of oxygenates in bio-oil was correlated with a first-order exponential decay model, exhibiting in all the cases a rootmean-square error (r 2 ) of 1.00.…”

Section: Process Analysis 211 Effect Of Process Temperaturesupporting

confidence: 90%

“…Their study, which examined temperatures of 350, 400, and 450 • C under a pressure of 1.0 atm, demonstrated that the concentration of hydrocarbons increased while the concentration of oxygenates decreased with rising temperature. Additionally, it was observed that the concentrations of alkanes, alkenes, and aromatics in the bio-oil increased with temperature, suggesting that higher pyrolysis temperatures promote the formation of hydrocarbons [32].…”

Section: Process Analysis 211 Effect Of Process Temperaturementioning

confidence: 99%

“…The concentration of oxygenates in bio-oil was correlated with a first-order exponential decay model, exhibiting in all the cases a root-mean-square error (r 2 ) of 1.00. According to de Sousa et al [32], the concentrations of cresols, phenols, and ketones decrease with increasing pyrolysis temperature because of deoxygenation reactions converting phenols, esters, and ketones into hydrocarbons, carbon monoxide, carbon dioxide, and water (decarboxylation and decarbonylation). The mechanism of deoxygenation is not well understood, but it seems that the reaction rate of deoxygenation is influenced positively by reaction temperature.…”

Section: Process Analysis 211 Effect Of Process Temperaturementioning

confidence: 99%

“…In addition, temperature is one of the key factors influencing the thermochemical decomposition of biomass compounds during the production of bio-oil by pyrolysis. The bio-oil obtained by the pyrolysis of açaí seeds contains hydrocarbons and an oxygenate fraction rich in phenols [31,32], which are of great interest due to their potential applications as sources of antioxidants, nutraceuticals, and preservatives in the food industry [33,34]. In the food industry, phenolic compounds are recognized for their natural antioxidant properties.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Antioxidant Activity, Yield, and Hydrocarbon Content of Bio-Oil from the Pyrolysis of Açaí Seeds by Chemical Activation: Effect of Temperature and Molarity

Valois,

Bezerra,

Assunção

et al. 2024

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Biomass-derived products are a promising way to substitute the necessity for petroleum-derived products, since lignocellulosic material is widely available in our atmosphere and contributes to the reduction of greenhouse gases (GHGs), due to zero net emissions of CO2. This study explores the impact of temperature and molarity on the pyrolysis of açaí seeds (Euterpe oleracea, Mart.) activated with KOH and subsequently on the yield of bio-oil, hydrocarbon content of bio-oil, antioxidant activity of bio-oil, and chemical composition of the aqueous phase. The experiments were carried out at 350, 400, and 450 °C and 1.0 atmosphere, with 2.0 M KOH, and at 450 °C and 1.0 atmosphere, with 0.5 M, 1.0 M, and 2.0 M KOH, at laboratory scale. The composition of bio-oils and the aqueous phase were determined by GC-MS, while the acid value, a physicochemical property of fundamental importance in biofuels, was determined by AOCS methods. The antioxidant activity of bio-oils was determined by the TEAC method. The solid phase (biochar) was characterized by X-ray diffraction (XRD). The diffractograms identified the presence of Kalicinite (KHCO3) in biochar, and those higher temperatures favor the formation peaks of Kalicinite (KHCO3). The pyrolysis of açaí seeds activated with KOH show bio-oil yields from 3.19 to 6.79 (wt.%), aqueous phase yields between 20.34 and 25.57 (wt.%), solid phase yields (coke) between 33.40 and 43.37 (wt.%), and gas yields from 31.85 to 34.45 (wt.%). The yield of bio-oil shows a smooth exponential increase with temperature. The acidity of bio-oil varied between 12.3 and 257.6 mg KOH/g, decreasing exponentially with temperature, while that of the aqueous phase varied between 17.9 and 118.9 mg KOH/g, showing an exponential decay behavior with temperature and demonstrating that higher temperatures favor not only the yield of bio-oil but also bio-oils with lower acidity. 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 and 25.71 (area.%), increasing with temperature, while that of oxygenates varied between 52.69 and 72.15 (area.%), decreasing with temperature. For the experiments with constant temperature, the concentrations of hydrocarbons in bio-oil increased exponentially with molarity, while those of oxygenates decreased exponentially, showing that higher molarities favor the formation of hydrocarbons in bio-oil. The antioxidant activity of bio-oils decreases with increasing temperature, as the content of phenolic compounds decreases, and it decreases with increasing KOH molarity, as higher molarities favor the formation of hydrocarbons. Finally, it can be concluded that chemical activation of açaí seeds with KOH favors not only the yield of bio-oil but also the content of hydrocarbons. The study of process variables is of utmost importance in order to clearly assess reaction mechanisms, economic viability, and design goals that could be derived from chemically activated biomass pyrolysis processes. The study of the antioxidant properties of pyrolysis oils provides insight into new products derived from biomass pyrolysis.

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Section: Process Analysis 211 Effect Of Process Temperaturesupporting

confidence: 91%

Section: Process Analysis 211 Effect Of Process Temperaturesupporting

confidence: 90%

Section: Process Analysis 211 Effect Of Process Temperaturementioning

confidence: 99%

Section: Process Analysis 211 Effect Of Process Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the Antioxidant Activity, Yield, and Hydrocarbon Content of Bio-Oil from the Pyrolysis of Açaí Seeds by Chemical Activation: Effect of Temperature and Molarity

Valois,

Bezerra,

Assunção

et al. 2024

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

et al. 2023

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In this study, we investigated the acid (HCl) and alkali (KOH) chemical activation of açaí seeds (Euterpe Oleraceae, Mart.) pre-treatment before pyrolysis at temperatures of 350–450 °C in order to assess how reactions proceed when affected by temperature. Chemical composition of bio-oil and aqueous phase were determined by GC-MS and FT-IR. The bio-char is 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 experiments have shown that bio-oil yield increases with temperature for the KOH activated biomass and decreases for the acid activated one. The KOH bio-oil is primarily composed of alcohols and ketones, showing the lowest acid values when compared with the HCl one, which is composed mainly of carboxylic acids and phenols. An increase in alcohol content and a decrease in ketones in the KOH bio-oil with temperature suggests conversion reactions between these two functions. For HCl bio-oil, carboxylic acid concentration increases with temperature while phenols decrease. For production of hydrocarbons, KOH activated biomass pyrolysis is better than acid-activated one, since no hydrocarbons were produced for HCl bio-oil.

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Análise Da Composição Química Do Bio-Óleo Produzido via Pirólise De Sementes De Açaí (Euterpe Oleracea, Mart) / Chemical Analysis of Bio-Oil Produced by Pyrolise of Açaí (Euterpe Oleracea, Mart) Seeds

Cited by 2 publications

References 7 publications

Improving the Antioxidant Activity, Yield, and Hydrocarbon Content of Bio-Oil from the Pyrolysis of Açaí Seeds by Chemical Activation: Effect of Temperature and Molarity

Improving the Antioxidant Activity, Yield, and Hydrocarbon Content of Bio-Oil from the Pyrolysis of Açaí Seeds by Chemical Activation: Effect of Temperature and Molarity

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

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