Bio-Gasoline and Bio-Kerosene Production by Fractional Distillation of Pyrolysis Bio-Oil Açaí Seeds

Da, Rocha de Castro; Hj, da Silva Ribeiro; Lh, Hamoy Guerreiro; L, Pinto Bernar; Sj, Sebesta; H, da Silva Almeida; M, Costa Santos; S, Duvoisin Jr; Le, Pizarro Borges; N, Teixeira Machado

doi:10.20944/preprints202102.0188.v1

Cited by 1 publication

(6 citation statements)

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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 pilotscale 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: Effect Of Process Temperaturesupporting

confidence: 91%

“…al. [32]. The concentration of oxygenates in bio-oil were correlated with a first order exponential decay model, exhibiting in all the cases root-mean-square error (r 2 ) of 1.00.…”

Section: Effect Of Process Temperaturementioning

confidence: 93%

“…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]. Figure 10 illustrates the concentration of oxygenates in bio-oil.…”

Section: Effect Of Process Temperaturementioning

confidence: 99%

“…al. [32], the concentration 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). Mechanism of deoxygenation is not well understood but it seems that reaction rate of deoxygenation is influenced positively by reaction temperature.…”

Section: 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 pyrolysis of Açaí seeds contains hydrocarbons and a 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 [34]. In the food industry, phenolic compounds are recognized for their natural antioxidant properties.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Yield and Quality of Bio-Oil from Açaí Seeds Pyrolysis by Activation with KOH: Effect of Temperature and Molarity

Valois¹,

Bezerra²,

Assunção³

et al. 2023

Preprint

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This study explores the impact of temperature and molarity on the pyrolysis of Açaí seeds (Euterpe Oleraceae, Mart.) activated with KOH on the yield of bio-oil, hydrocarbon content of bio-oil, antioxidant activity of bio-oil and chemical composition of 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 at-mosphere, with 0.5 M, 1.0 M and 2.0 M KOH, in laboratory scale. The composition of bio-oils and aqueous phase determined by GC-MS, while the acid value, a physical-chemical property of fundamental importance in biofuels, of bio-oils and aqueous phases by AOCS methods. The antioxidant activity of bio-oils determined by the TEAC method. The solid phase (biochar) characterized by X-ray diffraction (XRD). The diffractograms identified the presence of Kalicinite (KHCO3) in bio-char, 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 mgKOH/g, decreasing exponentially with temperature, while that of aqueous phase 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 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 constant temperature, the concentrations of hydrocarbons in bio-oil in-crease exponentially with molarity, while those of oxygenates decrease 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 de-creases with increasing KOH molarity, as higher molarities favors the formation of hydrocarbons. 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. 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.

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Section: Effect Of Process Temperaturesupporting

confidence: 91%

“…al. [32]. The concentration of oxygenates in bio-oil were correlated with a first order exponential decay model, exhibiting in all the cases root-mean-square error (r 2 ) of 1.00.…”

Section: Effect Of Process Temperaturementioning

confidence: 93%

Section: Effect Of Process Temperaturementioning

confidence: 99%

Section: Effect Of Process Temperaturementioning

confidence: 99%