Biodiesel production from wet microalgal biomass by direct transesterification

Sánchez, María D. Macías; Medina, Alfonso Robles; Hita-Peña, E.; Callejón, María J. Jiménez; Esteban-Cerdán, L.; Moreno, Pedro A. González; Grima, E. Molina

doi:10.1016/j.fuel.2015.01.106

Cited by 84 publications

(28 citation statements)

References 34 publications

(55 reference statements)

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“…Supercritical CO 2 presents advantages such as low toxicity, minimal oxidation or thermal degradation of extracts, rapid penetration through the cellular matrix, high diffusivity and facile product/solvent separation compared to conventional solvent extraction . Moreover, CO 2 does not contaminate the aqueous phase and does not require distillation to produce a solvent‐free extract . Supercritical CO 2 is nonpolar and therefore only interacts with a portion of the NLs; specifically, the unbound neutral lipids that do not form complexes with the polar lipids present in the cell wall.…”

Section: Lipid Extractionmentioning

confidence: 99%

“…52 Moreover, CO 2 does not contaminate the aqueous phase and does not require distillation to produce a solvent-free extract. [53][54][55][56] Supercritical CO 2 is nonpolar and therefore only interacts with a portion of the NLs; specifically, the unbound neutral lipids that do not form complexes with the polar lipids present in the cell wall. With the addition of a polar co-solvent, affinity towards the NLs that form complexes with polar lipids can be enhanced, leading to greater biodiesel production.…”

Section: Conventional Organic Solvent Extractionmentioning

confidence: 99%

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Advances in microalgal lipid extraction for biofuel production: a review

Harris

Viner

Champagne

et al. 2018

Biofuels Bioprod Bioref

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Algal biomass is an attractive feedstock for sustainable biofuel production because of its high growth rate and the fact that it does not compete with food crops. This review examines progress made in the processing and extraction of microalgal lipids as feedstocks for algae‐derived biofuels. The discussion focuses on lipid extraction processes but also mentions drying, cell disruption, and transesterification processes because of their potential effect on the extraction process, and because of the possibility of performing them simultaneously with extraction. Some of the common themes discussed include the benefits of utilizing wet microalgal biomass, combining process steps (process intensification), and the importance of considering the entire life cycle when assessing the ‘greenness’ of a technology. Lipid extraction technologies will need to be improved for microalgal biofuels to compete effectively with fossil fuels, particularly through the development of energy‐efficient extraction methods and the adaptation of these methods for large‐scale production. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Lipid Extractionmentioning

confidence: 99%

Section: Conventional Organic Solvent Extractionmentioning

confidence: 99%

Advances in microalgal lipid extraction for biofuel production: a review

Harris

Viner

Champagne

et al. 2018

Biofuels Bioprod Bioref

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“…29 3.6 | Biodiesel properties Table 5 shows the FAME properties for Nannochloropsis sp. [39][40][41][42][43][44][45] As shown in Table 6, the FAME composition varies between C8:0 and C24:0 across the studies. 34 The results were compared against the ASTM D6751-02 standard and EN 14214 standards.…”

Section: Process Optimizationmentioning

confidence: 99%

“…by using relationships provided previously. [39][40][41] 3.7 | Reaction kinetics of the synergistic effect of MW/US using Nannochloropsis sp. According to the results obtained in this study, the algal FAME does not meet the standards due to high cold flow plugging point (CFPP), which does not meet the EN 14214 standards.…”

Section: Process Optimizationmentioning

confidence: 99%

Optimization of wet microalgal FAME production from Nannochloropsis sp. under the synergistic microwave and ultrasound effect

et al. 2018

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Summary The synergistic effect of microwave and ultrasound irradiations was evaluated for biodiesel production from microalgae biomass (Nannochloropsis sp.) as raw material. A response surface methodology technique based on central composite design was used to understand the process parametric interdependence and optimize the process reaction variables. Reaction kinetics of algal fatty acid methyl ester (FAME) production was also studied. The optimum reaction conditions were determined as wet algal biomass to methanol ratio of 20 g to 30 mL, 1 wt% catalyst concentration, and 7‐minute reaction time at 140 W of microwave power and 140 W of ultrasound power. The estimated activation energy was 17,298 J/mol−1 K−1 for a first‐order reaction kinetics. This study revealed that microwave energy dissipation at a low rate of 140 W combined with 140 W of ultrasound intensity is adequate to produce FAMEs at a maximum yield of 48.2%. Results from this optimization study suggest that a more detailed and mechanistic energy optimization study is critical to increase the FAME yield and maximize energy benefits.

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“…This method is simple to perform, very rapid, and visual, and it does not require sophisticated instrumentation. The application of this method is based on a comparison of the presence, intensity, and size of spots that correspond to different compounds in the reaction mixture with those of standard (reference) compounds; it gives only qualitative results and does not allow one to accurately determine the degree of conversion [29] without the use of additional equipment.…”

mentioning

confidence: 99%

Gas-chromatographic determination of the degree of conversion of microbiological synthesis products into biodiesel

et al. 2016

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In the development of promising methods for the production of biodiesel from different raw materials, it was proposed to perform the comparative evaluation of the degree of conversion of the source material and the effectiveness of the heterogeneous catalyst used by the gas-chromatographic determination of the resulting amount of glycerol with the direct injection of a reaction mixture (or end products) into the column without derivatization. A Bruker 430 GS gas chromatograph with a flame-ionization detector and a quartz capillary column in the isothermal regime was used for determining the glycerol formed. The degree of conversion was evaluated in a study of the transesterification of sunflower oil and microalgae lipids with the use of the enzyme catalyst Novozym 435. For comparison, the degree of conversion was determined by HPLC-MS based on the triglyceride content of the reaction mixture.

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Biodiesel production from wet microalgal biomass by direct transesterification

Cited by 84 publications

References 34 publications

Advances in microalgal lipid extraction for biofuel production: a review

Advances in microalgal lipid extraction for biofuel production: a review

Optimization of wet microalgal FAME production from Nannochloropsis sp. under the synergistic microwave and ultrasound effect

Gas-chromatographic determination of the degree of conversion of microbiological synthesis products into biodiesel

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