Single-step conversion of wet Nannochloropsis gaditana to biodiesel under subcritical methanol conditions

Sitthithanaboon, Weena; Reddy, Harvind K.; Muppaneni, Tapaswy; Ponnusamy, Sundaravadivelnathan; Punsuvon, Vittaya; Holguim, Francisco; Dungan, Barry; Deng, Shuguang

doi:10.1016/j.fuel.2015.01.051

Cited by 34 publications

(15 citation statements)

References 40 publications

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“…It is mostly considered environmental friendly and inexpensive due to the significant in of the production time [25]. The main advantages of transesterification in subcritical condition for biodiesel production was high conversion and reaction rates [26]. The operating temperature under subcritical methanol ranges from 150 to 250 • C [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Winoto

Yoswathana

2019

Energies

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The molar ratio of methanol to rubber seed oil (RSO), catalyst loading, and the reaction time of RSO biodiesel production were optimized in this work. The response surface methodology, using the Box–Behnken design, was analyzed to determine the optimum fatty acid methyl ester (FAME) yield. The performance of various nanomagnetic CaO-based catalysts—KF/CaO-Fe3O4, KF/CaO-Fe3O4-Li (Li additives), and KF/CaO-Fe3O4-Al (Al additives)—were compared. Rubber seed biodiesel was produced via the transesterification process under subcritical methanol conditions with nanomagnetic catalysts. The experimental results indicated that the KF/CaO-Fe3O4-Al nanomagnetic catalyst produced the highest FAME yield of 86.79%. The optimum conditions were a 28:1 molar ratio of methanol to RSO, 1.5 wt % catalyst, and 49 min reaction time. Al additives of KF/CaO-Fe3O4 nanomagnetic catalyst enhanced FAME yield without Al up to 18.17% and shortened the reaction time by up to 11 min.

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Section: Introductionmentioning

confidence: 99%

“…The main advantages of transesterification in subcritical condition for biodiesel production was high conversion and reaction rates [26]. The operating temperature under subcritical methanol ranges from 150 to 250 • C [26,27]. Subcritical methanol at 220 • C achieved the highest FAME yield.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Winoto

Yoswathana

2019

Energies

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“…Both nitrogen and oxygen contents can be reduced either by upgrading the bio-oil (Guo et al, 2015) or adding catalysts during HTL (Pragya et al, 2013). Recently, it has been reported that processing microalgae with organic solvents can led to better bio-oil quality; some examples are ethanol (Huang et al, 2011;Chen et al, 2012;Reddy et al, 2014;Zhang and Zhang, 2014;Peng et al, 2016), methanol (Patil et al, 2011;Sitthithanaboon et al, 2015) and others (Yuan et al, 2011;Jin et al, 2014a). However, most of these experiments were performed in pure organic solvents or with a negligible amount of water compared to the amount of the organic solvent, which requires low-water content in microalgae.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 1 summarises the operating conditions applied by several authors using alcohols as co-solvents for the HTL of microalgae amongst some other substrates (Yuan et al, 2007;Cheng et al, 2010;Patil et al, 2011;Chen et al, 2012;Jin et al, 2014b;Reddy et al, 2014;Zhang and Zhang, 2014;Sitthithanaboon et al, 2015). Processing wet microalgae with organic solvents resulted in increased bio-oil and biodiesel yields (Patil et al, 2011;Chen et al, 2012;Jin et al, 2014a,b;Reddy et al, 2014;Zhang and Zhang, 2014), but the experiments were carried out at high temperatures (Chen et al, 2012) and high con-centration of alcohols (Reddy et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

Caporgno

Pruvost

Legrand

et al. 2016

Bioresource Technology

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Although the hydrothermal liquefaction is considered a promising technology for converting microalgae into liquid biofuels, there are still some disadvantages. This paper demonstrated that the bio-oil yield can be significantly improved by adding alcohols as co-solvents and carrying out the conversion at mild conditions (<250°C), but at the expense of a reduced bio-oil quality. By adding ethanol, the bio-oil yields obtained (up to ∼60%) were comparable to the yield obtained at severe operating conditions using only water as solvent (54±2% on average), but the quality of the bio-oil was lower. However, the main advantages of the process here described lie in the utilisation of wet microalgae (∼75% moisture) and alcohol concentrations which avoid both drying the microalgae and decreasing the amount of microalgae loaded in the reactor.

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“…As demonstrated in Fig. , the asymmetric axial stretching vibrations of O–C–C bonds appear at about 1165 cm −1 , and the C=O stretching of methyl ester is observed at 1745 cm −1 , indicating that the main components of camelina biodiesel are aliphatic hydrocarbons .…”

Section: Resultsmentioning

confidence: 99%

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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Single-step conversion of wet Nannochloropsis gaditana to biodiesel under subcritical methanol conditions

Cited by 34 publications

References 40 publications

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

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

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Single-step conversion of wet Nannochloropsis gaditana to biodiesel under subcritical methanol conditions

Cited by 34 publications

References 40 publications

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

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

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