Effect of water content on [Bmim][HSO4] assisted in-situ transesterification of wet Nannochloropsis oceanica

Sun, Yingqiang; Xu, Chunyan; Igou, Thomas; Liu, Peilu; Hu, Zixuan; Ginkel, Steven W. Van; Chen, Yongsheng

doi:10.1016/j.apenergy.2018.06.029

Cited by 30 publications

(14 citation statements)

References 37 publications

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“…[8] Among vast biomass resources for bio-oil production, microalgae are recognized as the most promising biofuel feedstocks because of their high photosynthetic efficiency, fast growth rate and high lipid content properties. [9][10][11] During the HTL of microalgae, their cellular compounds including lipids, proteins, and carbohydrates are converted into bio-oil, water soluble nutrients, gases, and residues, through hydrolysis of cellular compositions into monomers, deamination, decarboxylation and dehydration of the monomers, and the following tandem reaction including cyclization, condensation and repolymerization of the fragments. [12,13] Besides the valuable bio-oil products, the inorganic nutrients of microalgae are transformed into water soluble nutrients during HTL process, which can be recycled for algae growth.…”

Section: Introductionmentioning

confidence: 99%

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Shen

Long

et al. 2020

ChemSusChem

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Hydrothermal liquefaction (HTL) of microalgae for biofuel production is suffering from low bio-oil yield and high heteroatomic compositions owing to their low efficiency and selectivity to hydrolysis of cellular compounds. Hereby we report Keggin-type (MoÀ VÀ P) heteropolyacids (HPAs)-catalyzed HTL of microalgae for efficient low-nitrogen biocrude production. The increases of reaction temperature, reaction time, and vanadium substitution degrees of HPAs are favorable to biocrude yield initially, whereas a significant decrease of biocrude yield is observed owing to the enhanced oxidation of carbohydrates above the optimum reaction conditions. The maximum biocrude yield of HPAs-catalyzed HTL of microalgae is 29.95 % at reaction temperature of 300°C, reaction time of 2 h, and 5 wt% of HPA-4, which is about 19.66 % higher than that of control with 71.17 % less N-containing compounds, including 1,3-propanediamine, 1-pentanamine, and 2, 2'heptamethylene-di-2-imidazoline than that of control. This work reveals that HPAs with Brønsted acidity and reversible redox properties are capable of both enhancing biocrude production via catalyzing the hydrolysis of cellular compounds and reducing their nitrogen content through avoiding the Maillard reactions between the intermediates of hydrolysis of carbohydrates and proteins. HPAs-catalyzed HTL is an efficient strategy to produce low N-containing biofuels, possibly paving the way of their direct use in modern motors.

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Section: Introductionmentioning

confidence: 99%

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Shen

Long

et al. 2020

ChemSusChem

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“…(ii) More methanol increases the contact probability of methanol and camelina oil. (iii) Extra methanol is also a good solvent of [Bmim][HSO 4 ], which is favorable to the ionization of [Bmim][HSO 4 ] .…”

Section: Resultsmentioning

confidence: 99%

“…Ionic liquids (ILs) are organic salts are composed of organic cations and organic/inorganic anions, which are usually in liquid state below 100 °C . They are recognized as “green solvents” due to their low melting point, low vapor pressure, and high thermal stability .…”

Section: Introductionmentioning

confidence: 99%

“…They are recognized as “green solvents” due to their low melting point, low vapor pressure, and high thermal stability . Recently, acid/basic ILs have been widely used in biofuel studies because of their solubility of cellulose and catalytic property of transesterification , . Also, Brønsted or Lewis acid ionic liquids (ILs) can also catalyze the transesterification since they can donor protons , .…”

Section: Introductionmentioning

confidence: 99%

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Optimization of [Bmim][HSO₄]‐Catalyzed Transesterification of Camelina Oil

Shen

et al. 2019

Chem Eng & Technol

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1‐Butyl‐3‐methylimidazolium hydrogen sulfate ([Bmim][HSO4]) is utilized to catalyze transesterification of camelina oil with methanol. The major compositions of camelina biodiesel are saturated fatty acid esters (C16:0, C18:0), monounsaturated, and polyunsaturated fatty acid esters (C18:2, C18:3). The effects of reaction temperature, reaction time, Mmethanol:MCamelina oil, and M[Bmim][HSO4]:MCamelina oil on biodiesel production are investigated in detail, and a general mathematical model is developed to well predict the biodiesel yield. Also, [Bmim][HSO4] is thermally stable to recycle for four times with a high biodiesel yield. The fuel properties of camelina biodiesel are all comparable to the American Society for Testing Materials (ASTM) standards.

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“…%, in raw oil might enhance hydrolysis of fatty acids, which leads to activation of the transesterification reaction [9]. Sun et al [10] studied the effect of water content in wet Nannochloropsis oceanica on 1-butyl-3-methylimidazolium hydrogen sulfate ([Bmim][HSO 4 ])-catalyzed in situ transesterification. They found that when the water content was increased from 0 wt.…”

Section: Introductionmentioning

confidence: 99%

Fluid Characteristics of Biodiesel Produced from Palm Oil with Various Initial Water Contents

Lin

2021

Processes

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Biodiesel is regarded as a significant alternative fuel to petrodiesel due to its excellent combustion features and renewable character. The water content in the reactant mixtures needs to be considered so as to retard the conversion rate and it is suggested to be kept as low as possible. The fluid characteristics of biodiesel might be affected by initial water content; however, the optimum ratio of water content added to raw oil for achieving superior fluid characteristics of biodiesel has not yet been studied. Hence, this study empirically investigated the influences of the initial water content added to raw feedstock oil on the fluid characteristics of biodiesel. The experimental results show that an adequate amount of water content in the reactant mixture was found effective for improving the transesterification reaction and, in turn, the fluid characteristics. The biodiesel made from raw oil with 0.05 wt. % water content added was observed to bear the lowest water content, acid value, and cold filter plugging point (CFPP) and, therefore, superior fluidity at low temperatures. The lower CFPP of biodiesel is attributed to its more unsaturated fatty acids and lower iodine value. In addition, the biodiesel produced from feedstock oil with 0.02 wt. % water added was observed to have the lowest iodine value but the highest kinematic viscosity. The optimum content of initial water added to palm oil for superior fluid characteristics of the biodiesel product is thus suggested to be in the range between 0.02 wt. % and 0.05 wt. %.

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Effect of water content on [Bmim][HSO4] assisted in-situ transesterification of wet Nannochloropsis oceanica

Cited by 30 publications

References 37 publications

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Optimization of [Bmim][HSO₄]‐Catalyzed Transesterification of Camelina Oil

Fluid Characteristics of Biodiesel Produced from Palm Oil with Various Initial Water Contents

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Effect of water content on [Bmim][HSO4] assisted in-situ transesterification of wet Nannochloropsis oceanica

Cited by 30 publications

References 37 publications

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Optimization of [Bmim][HSO4]‐Catalyzed Transesterification of Camelina Oil

Fluid Characteristics of Biodiesel Produced from Palm Oil with Various Initial Water Contents

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Optimization of [Bmim][HSO₄]‐Catalyzed Transesterification of Camelina Oil