Stabilizing sunflower biodiesel with synthetic antioxidant blends

Westhuizen, Isbe Van der; Focke, Walter Wilhelm

doi:10.1016/j.fuel.2018.01.086

Cited by 46 publications

(22 citation statements)

References 19 publications

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“…However, as is common in biodiesel from vegetable oils, the oxidative stability is low, not complying with the standard. Nevertheless, biodiesel from similar feedstocks showed shorter induction periods (Focke et al, ; Knothe and Razon, ; Westhuizen and Focke, ). The unsaturations of the chain of many FAME are related to low oxidative stabilities, especially in the case of double or triple unsaturations.…”

Section: Resultsmentioning

confidence: 99%

“…, the FAME profile had over 85% of unsaturated FAME, which could explain the above‐mentioned reasoning. Consequently, the addition of antioxidants is needed and justified, as is carried out in most cases in the literature (Dunn, ; Pullen and Saeed, ; Saluja et al, ; Varatharajan and Pushparani, ; Westhuizen and Focke, ). Compared to the literature, these values were similar to other FAME from different sources such as olive oil (60.76% methyl oleate and 18.45% methyl linoleate) or rapeseed oil (60.…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Nogales-Delgado

Martín

Cabanillas

et al. 2019

J Americ Oil Chem Soc

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Biodiesel is an alternative to mineral fuels, with advantages such as biodegradability. However, this makes biodiesel unstable to oxidation. In this way, the use of natural or synthetic antioxidants is necessary. Although many studies have paid attention to the effect of these antioxidants on oxidation stability, not much literature about their effect of them on other properties (before and during storage) was found. The aim of this research study was to characterize biodiesel from corn and sunflower by adding two antioxidants, butylated hydroxyanisole (BHA) and tertbutylhydroquinone (TBHQ), in order to improve its oxidation stability. Moreover, the effect of oxidation on the parameters of biodiesel was studied by using extreme oxidation conditions to accelerate the oxidation process. Both antioxidants improved the oxidation stability of biodiesel, whereas some parameters were altered (viscosity and acid number), which could make this biofuel, if high concentrations of antioxidants are used, unsuitable for commercialization according to standards.Keywords BHA Á TBHQ Á Oxidation stability Á Viscosity Á Thermal analysis Á Fatty acid methyl esters J Am Oil Chem Soc (2020) 97: 201-212.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Nogales-Delgado

Martín

Cabanillas

et al. 2019

J Americ Oil Chem Soc

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“…As mentioned previously, safflower biodiesel required antioxidant addition to increase its oxidative stability. For this purpose, BHA and TBHQ, two antioxidants with many uses in industry, were selected at the most usual concentrations found in the literature (from 100 to 1000 ppm) [38,42,61].…”

Section: Antioxidant Additionmentioning

confidence: 99%

“…Consequently, the mixture with other more stable biodiesel [40], the use of antioxidants (both natural and artificial) [41][42][43][44][45], and other chemical reactions [34] have been attempted in order to increase the oxidative stability of biodiesel samples, to revalue this product. Although the raw material usually contains natural antioxidants, during biodiesel production and purification they are usually missed.…”

Section: Introductionmentioning

confidence: 99%

Safflower Biodiesel: Improvement of its Oxidative Stability by Using BHA and TBHQ

2019

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Biodiesel is gaining more and more importance due to environmental issues. This way, alternative and sustainable crops as new biofuel sources are demanded. Safflower could be a sustainable raw material for biodiesel production, showing one disadvantage (as many biodiesels from vegetable oils), that is, a short oxidative stability. Consequently, the use of antioxidants to increase this parameter is mandatory. The aim of this research work was to assess the effect of two antioxidants (butylated hydroxyanisole, BHA, and tert-butylhydroquinone, TBHQ) on the oxidative stability of safflower biodiesel, which was characterized paying attention to its fatty acid methyl ester profile. For oxidative stability, the Rancimat method was used, whereas for fatty acid profile gas chromatography was selected. For the remaining parameters, the methods were followed according to the UNE-EN 14214 standard. The overall conclusion was that safflower biodiesel could comply with the standard, thanks to the use of antioxidants, with TBHQ being more effective than BHA. On the other hand, the combined use of these antioxidants did not show, especially at low concentrations, a synergic or additive effect, which makes the mixture of these antioxidants unsuitable to improve the oxidative stability.

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“…The search for several sources of renewable energy to produce biofuels, in order to replace fossil diesel, has been increasing every year. Among the many advantages of biodiesel compared to diesel are the raw material used in its production, which is renewable (DÍAZ et al 2018;WESTHUIZEN & FOCKE, 2018;, FOCKE et al 2012, the low emission of greenhouse gases (SERES et al 2015;LINARES et al 2014) and the reduction in the emission of particulate matter (KNOTHE, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of the natural antioxidant eugenol on quality preservation of commercial biodiesels produced with soybean oil or waste frying oil during storage at different temperatures

Souza

Ramos

Santos

et al. 2018

CeN

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The objetive of this study was to evaluate the eugenol antioxidant efficiency on the oxidation stability of commercial biodiesel synthesized from soybean oil (SB) and wast fring oil (ORB) by determining induction period (IP) and acid number (AN) during storage at 10 °C or in accelerated oxidation test at 85 °C. For the oxidation stability evaluation, the Rancimat method (EN 14112) and AN (ASTM D664) analyses were used. The initial studies showed that the antioxidants eugenol and TBHQ when added separately increased IP values for the two types of biodiesel analyzed. During the storage at 10 °C, the IP was reduced for all samples. However, the lowest reduction percentages were for samples containing eugenol (-2.07 and -11.30% for SB and ORB, respectively). In relation to AN, the samples with the antioxidant eugenol led a greater decrease of this index, with the 10000 mg kg-1 concentration being the most efficient in the conservation of biodiesel. In the accelerated oxidation test in oven at 85 °C, pure BS presented higher susceptibility to degradation than the sample containing 10000 mg kg-1 of eugenol. In both storage studies, the eugenol natural antioxidant efficiency in the control of oxidative degradation of biodiesel becomes evident.

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Stabilizing sunflower biodiesel with synthetic antioxidant blends

Cited by 46 publications

References 19 publications

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

The Effect of Antioxidants on Corn and Sunflower Biodiesel Properties under Extreme Oxidation Conditions

Safflower Biodiesel: Improvement of its Oxidative Stability by Using BHA and TBHQ

Effect of the natural antioxidant eugenol on quality preservation of commercial biodiesels produced with soybean oil or waste frying oil during storage at different temperatures

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