Impact of antioxidant additives on the oxidation stability of biodiesel produced from Croton Megalocarpus oil

Kivevele, Thomas; Mbarawa, Makame; Bereczky, Ákos; Laza, Tamás; Madarász, János

doi:10.1016/j.fuproc.2011.02.009

Cited by 103 publications

(73 citation statements)

References 26 publications

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“…It was noted that although the oxidation stability index (OSI) of croton biodiesel satisfied the ASTM-6751 limit of 3 h, it did not meet the EN-14112/IS-15607 standard of 6 h. The low oxidation stability of croton biodiesel can be explained by the high proportion of polyunsaturated fatty acid methyl ester of about 78 % which makes it quite susceptible to oxidation [8,26].…”

Section: Resultsmentioning

confidence: 99%

“…Although TBHQ also has -OH groups bonded to the aromatic ring on the 1, 4 positions, its lower antioxidant activity as compared to BHA can be explained by undesirable prooxidant interaction with biodiesel and blends, which in some cases can result to a reduction in the oxidation stability of biodiesel [26]. The Rancimat IPs for croton biodiesel with either tert-butylhydroquinone (TBHQ) or Butylated hydroxytoluene were both lower than the European (EN-14112/IS-15607) recommended value of 6 h for biodiesel.…”

Section: Resultsmentioning

confidence: 99%

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Effects of antioxidants on oxidation and storage stability of Croton megalocarpus biodiesel

Osawa

Sahoo

Onyari

et al. 2015

Int J Energy Environ Eng

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The effects of antioxidants and storage on oxidation stability of croton biodiesel and its blends with petro-diesel were determined using PetroOxy equipment. The biodiesel and blends were kept in Pyrex reagent bottles and stored in a metallic locker at room temperature for 8 weeks, a condition that imitated ordinary storage environment in tanks before use. The oxidation stability indices of the biodiesel and blends were determined by measuring Rancimat induction periods for 8 weeks at intervals of 2 weeks. Although the Rancimat induction period for freshly prepared biodiesel of 4 h was higher than the commonly used American standard (ASTM D6751) limit of 3 h, it was lower than the European standard (EN 14214) of 6 h. The induction periods of B50 and lower blends were, however, equal to or greater than 6 h. The Rancimat induction periods for biodiesel with 100 ppm antioxidants were 5.6, 6.8 and 7.8 h for Butylated hydroxyanisol (BHA), Propyl gallate (PRG) and Pyrogallol (PYG), respectively, while the Rancimat induction periods for biodiesel with 1000 ppm antioxidants were 6.8, 8.2 and 10 h for BHA, PRG and PYG, respectively. The oxidation stability index for neat biodiesel decreased by 45 % while that for biodiesel with 1000 ppm antioxidants depreciated by 16, 12.2 and 20.59 % for PYG, PRG and BHA, respectively, during the 8-week storage period. A more rapid decline in oxidation stability was observed in the biodiesel and blends without antioxidants than those with antioxidants. The results from this study showed that the use of appropriate concentrations of suitable antioxidants can greatly improve the oxidation stability of biodiesel and blends which can therefore be stored over longer periods of time before use without undergoing extensive and deleterious oxidative deterioration.Keywords Croton biodiesel Á Oxidation stability Á Antioxidants Á Storage stability

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of antioxidants on oxidation and storage stability of Croton megalocarpus biodiesel

Osawa

Sahoo

Onyari

et al. 2015

Int J Energy Environ Eng

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“…Vapour produced during oxidation reaction from the biodiesel samples were flown together with air and collected in the flash containing distilled water. This flash was completed with conductivity meter to measure conductivity of produced oxidation samples in the reaction flash [5], [7].…”

Section: B Ip Measuring Kit and Limit Of Detectionmentioning

confidence: 99%

“…2, it can be concluded that concentration of 20 ppm of PY is the optimum PY concentration, providing the IP of 7.1 hours. Reference [5] obtained IP increase from 4 hours to become 12.1 hours when biodiesel from Croton Megalocarpus Oil (COME) was added 200 ppm PY antioxidant. Addition of PY antioxidant for biodiesel resulting from this study (PFAD or CPO quality 4) only consumed 1/10 of PY concentration added into COME.…”

Section: Addition Of Antioxidant 1) Addition Of Pyrogallol (Py)mentioning

confidence: 99%

“…Several types of antioxidant usually added include butylated hydroxyanisole (BHA), pyrogallol (PY), propylgallate (PG), tert-butyl hydroquinone (TBHQ). The type and doses of antioxidant applied depend on raw materials of biodiesel, as well as its composition and mixture [5], [6]. This research studied about type and doses of antioxidant added into the biodiesel produced from crude palm oil (CPO) quality 4 or called palm fatty acid distillate (PFAD).…”

Section: Introductionmentioning

confidence: 99%

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Increase of Oxidation Stability of Biodiesel from Palm Fatty Acid Distillate (PFAD) by Antioxidant Additions

Budiastuti¹,

Widarti²,

Riniati³

2015

JOCET

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Abstract-Biodiesel is a renewable energy, possesses high cetane number and flash points, resulting in its suitable uses in diesel machines and its safe distribution and storage, as well as low gas emission, and its function as lubricant. Disadvantages of the biodiesel include its high density and viscosity, resulting in plug and ineffective injection system, and low oxidation stability. This research studied about antioxidant additions to maintain oxidation stability of biodiesel. Induction period (IP) measuring kit, to measure oxidation stability, was constructed by using modified Rancimat principle. The best operation conditions were at temperature of 110 0 C and pressure of <100 Kpa/h, resulting in relation coefficient (r) of 0.996 and detection limits of 6.54 ppm of oil samples. Palm fatty acid distillate (PFAD) used contains free fatty acids (FFA) of 86.43%. The IP of the biodiesel was only 1.7 hours. The optimum concentration of pyrogallol (PY) antioxidant added into biodiesel was 20 ppm whereas of propylgallate (PG) was 40 ppm. At these concentrations, the biodiesel IP increased to become 7.1 and 6.5 hours, respectively. Additions of these antioxidants fulfill the IP requirement of biodiesel measured by European Standard of EN 14214 (> 6 hours).

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Effects of Temperature, Antioxidants, and High‐Vacuum Distillation on the Oxidation of Biodiesel Derived from Waste Vegetable Oil

Maglinao

Wagner

Duff

2020

J Americ Oil Chem Soc

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Biodiesel offers several environmental benefits and improvements to some fuel performance properties, but its poor oxidative stability has been a major concern. Currently, the accepted practice to improve biodiesel oxidative stability is the addition of antioxidants; numerous antioxidants have been studied but their effectiveness in inhibiting biodiesel oxidation is difficult to predict due to variation with resonance stability, solubility, reactivity, and volatility. To improve prediction efforts, this study explored the Rapid Small‐Scale Oxidation Test (RSSOT) as a means to investigate how biodiesel oxidation is affected by antioxidant concentration and temperature, and compared its results with the oxidative stability index test. A weak correlation was identified due to antioxidant variation. A kinetic model expressed in temperature and induction period was developed for biodiesel before high‐vacuum distillation (HVD), after HVD and also after HVD with three concentrations of propyl gallate (PG) and tert‐butylhydroquinone (TBHQ) antioxidants. The approach was validated by comparing collected data on the oxidation of methyl oleate with kinetic parameters found in the literature. Antioxidant concentrations from 130–930 ppm were tested, and the results revealed that the apparent activation energy of biodiesel oxidation increases with increasing concentration of primary antioxidants and decreases during vacuum distillation. When treated with an increasing concentration (130–930 ppm) of PG and TBHQ, the apparent activation energies of a vacuum distilled biodiesel changed from 108.46 ± 4.45 to 112.72 ± 1.46 kJ·mol−1 and from 77.14 ± 2.25 to 89.91 ± 2.29 kJ·mol−1, respectively. These observed trends agree with both the accepted mechanism of primary oxidation of fuels and mode of action of primary antioxidants.

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Impact of antioxidant additives on the oxidation stability of biodiesel produced from Croton Megalocarpus oil

Cited by 103 publications

References 26 publications

Effects of antioxidants on oxidation and storage stability of Croton megalocarpus biodiesel

Effects of antioxidants on oxidation and storage stability of Croton megalocarpus biodiesel

Increase of Oxidation Stability of Biodiesel from Palm Fatty Acid Distillate (PFAD) by Antioxidant Additions

Effects of Temperature, Antioxidants, and High‐Vacuum Distillation on the Oxidation of Biodiesel Derived from Waste Vegetable Oil

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