Oxidative stability of soybean oil fatty acid methyl esters by oil stability index (OSI)

2005 ◽  
Vol 82 (5) ◽  
pp. 381-387 ◽  
Author(s):  
Robert O. Dunn
Keyword(s):  
Fatty Acid ◽  
Soybean Oil ◽  
Oxidative Stability ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Stability Index ◽  
Oil Stability ◽  
Oil Stability Index ◽  
Acid Methyl

Catalytic hydrogenation of soybean oil-derived fatty acid methyl esters over Pd supported on Zr-SBA-15 with various Zr loading levels for enhanced oxidative stability

2018 ◽  
Vol 179 ◽  
pp. 422-435 ◽  
Author(s):  
Chachchaya Thunyaratchatanon ◽  
Apanee Luengnaruemitchai ◽  
Nuwong Chollacoop ◽  
Shih-Yuan Chen ◽  
Yuji Yoshimura
Keyword(s):  
Fatty Acid ◽  
Soybean Oil ◽  
Oxidative Stability ◽  
Catalytic Hydrogenation ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Acid Methyl

Evaluation of Dominant Parameters in Lipase Transesterification of Cottonseed Oil

2019 ◽  
Vol 62 (2) ◽  
pp. 467-474 ◽  
Author(s):  
Stanley Anderson ◽  
Terry Walker ◽  
Bryan Moser ◽  
Caye Drapcho ◽  
Yi Zheng ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Oxidative Stability ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Cottonseed Oil ◽  
Molar Ratio ◽  
Chromatography Method ◽  
Induction Periods ◽  
Acid Methyl ◽  
The Difference

Abstract. Eversa Transform was used as an enzymatic catalyst to transform glandless and crude (heavy pigment) cottonseed oils into biodiesel. The oils were reacted with methanol at a 6:1 molar ratio with modified amounts of water, lipase, and temperature. Reactions were conducted in the presence of lipase and water at doses of 2, 5, and 8 wt% and 1, 3, and 6 wt%, respectively. Product composition and conversion were determined using the gas chromatography method of ASTM D6584. Oxidative stability was determined following EN 15751. The conversion to fatty acid methyl esters averaged 98.5% across all samples. Temperature had the most significant effect on conversion (p < 0.0035). Lipase and water dosages did not affect conversion, while each had an effect with temperature that was significant across the difference between 3 and 1 wt% water content and between 8 and 5 wt% enzyme content between the two temperatures (p = 0.0018 and 0.0153), respectively. Induction periods (oxidative stability) of the glandless and crude cottonseed oils were significantly different, but there was no difference between the two oil conversions based on oil type. Keywords: Biodiesel, Cottonseed oil, Fatty acid methyl esters, Lipase, Oxidative stability, Transesterification.

Synthesis of Biodiesel by Different Carriers Supported KOH Catalyst

2012 ◽  
Vol 581-582 ◽  
pp. 197-201 ◽  
Author(s):  
Ling Mei Yang ◽  
Peng Mei Lv ◽  
Zhen Hong Yuan ◽  
Wen Luo ◽  
Hui Wen Li ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Soybean Oil ◽  
Heterogeneous Catalysts ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Catalyst Amount ◽  
Acid Methyl ◽  
And Performance

Transesterification of soybean oil with methanol to methyl eaters was found proceed in the presence of KOH loaded on five different oxides (CaO, MgO, Al2O3, Bentonite, kaolin) as heterogeneous catalysts. The structure and performance of these catalysts were studied using the techniques of XRD, CO2-TPD, and SEM. It was found that the 15wt% KOH/CaO catalyst provided best activity. In the presence of this catalyst, the yield of fatty acid methyl esters was 97.1%. The reaction conditions were as follows: methanol to soybean oil molar ratio was 16:1, temperature of 65 °C, reaction time of 1 h, and a catalyst amount of 4 wt%. The catalysts of KOH loaded on CaO showed a new crystalline phase of K2O. However, the catalyst of 15-KOH/CaO has more basic sites than the catalyst of 15-KOH/MgO. Therefore, the catalyst of 15-KOH/CaO has been associated with higher transesterification activity.

scholarly journals Creosote Bush (Larrea tridentata) Extract Assessment as a Green Antioxidant for Biodiesel

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1786 ◽  
Author(s):  
Carlos A. Sagaste ◽  
Gisela Montero ◽  
Marcos A. Coronado ◽  
José R. Ayala ◽  
José Á. León ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Oxidative Stability ◽  
Antioxidant Capacity ◽  
Fatty Acid Methyl Esters ◽  
Methanolic Extract ◽  
Methyl Esters ◽  
Larrea Tridentata ◽  
Creosote Bush ◽  
Antioxidant Power ◽  
Acid Methyl

In this work, the antioxidant properties of methanolic extract of Larrea tridentata were assessed through the free radical scavenging method, ferric reducing antioxidant power and oxygen radical absorbance capacity. The phenolic acids content in the extract was quantified by high-performance liquid chromatography (HPLC) and the total phenol content by the Folin–Ciocalteu method. The extract was used as an antioxidant in biodiesel from canola oil composed mostly by fatty acid methyl esters identified and quantified by gas chromatography-mass spectrophotometry (GC-MS). The performance of the extract as an antioxidant was assessed by the oxidative stability index (OSI) with a Rancimat equipment at 100, 110, 120 and 130 °C. Additionally, the change of the peroxide value (PV) and the higher heating value under conditions of oxidative stress at 100 °C and air injection were measured. The antioxidant capacity of the extract reached 50,000 TAEC (micromole of Trolox antioxidant equivalent capacity per gram). The biodiesel was constituted by more than 70% of unsaturated fatty acid methyl esters (FAME), mainly methyl oleate. The time needed to reach a PV of 100 meqO2/kg was almost four times longer with an antioxidant concentration of 250 mg/L than the blank. The biodiesel showed an OSI time of 1.25 h at 110 °C, while it increased to 8.8, 15.89 and 32.27 h with the antioxidant at concentrations of 250, 500 and 1000 mg/L, respectively. The methanolic Larrea tridentata extract proved to have an antioxidant capacity and it is a green antioxidant in biodiesel to increase its oxidative stability. According to the results obtained, the L. tridentata methanolic extract is an alternative to the commercial synthetic antioxidants used in biodiesel nowadays.

Density, refractive index and viscosity as content monitoring tool of acylglycerols and fatty acid methyl esters in the transesterification of soybean oil

2016 ◽  
Vol 8 (28) ◽  
pp. 5619-5627 ◽  
Author(s):  
Luis R. S. Kanda ◽  
Carlos I. Yamamoto ◽  
André R. Lopes ◽  
Fernando A. P. Voll ◽  
Marcos L. Corazza ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fatty Acid ◽  
Soybean Oil ◽  
Physical Properties ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Chemometric Analysis ◽  
Monitoring Tool ◽  
Acid Methyl

A chemometric analysis was developed to correlate physical properties with the composition of four-compound systems.

scholarly journals Potassium iodide–polyethylene glycol catalyzed cycloaddition reaction of epoxidized soybean oil fatty acid methyl esters with CO2

RSC Advances ◽  
2018 ◽  
Vol 8 (54) ◽  
pp. 30860-30867 ◽  
Author(s):  
Wei Liu ◽  
Guanghui Lu ◽  
Bing Xiao ◽  
Chenfei Xie
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acid ◽  
Polyethylene Glycol ◽  
Soybean Oil ◽  
Potassium Iodide ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Cycloaddition Reaction ◽  
Acid Methyl ◽  
Fixation Of Carbon Dioxide

Nowadays, the clean production of bio-based products and fixation of carbon dioxide (CO2) are highly desirable.

scholarly journals Synthesis, characterization and application of [CTA+]MCM-41 in the catalytic conversion of soybean oil to fatty acid methyl esters

2016 ◽  
Vol 12 (6) ◽  
pp. 4117-4126 ◽  
Author(s):  
Vinícius Kothe ◽  
Helton José Alves ◽  
Marcos Henrique Luciano Silveira ◽  
Luiz Pereira
Keyword(s):  
Catalytic Activity ◽  
Fatty Acid ◽  
Soybean Oil ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Solid Catalyst ◽  
Reaction Yield ◽  
Acid Methyl ◽  
Mesoporous Solids ◽  
Mcm 41

The transesterification of vegetable oil and/or animal fats in homogeneous alkaline medium is still the most widely used method for the production of biodiesel. However, this process requires raw materials with low acidity and moisture content to prevent undesirable side reactions such as saponification, which leads to emulsification and promotes losses in the reaction yield. Many solid compounds can be used in catalytic processes to reduce these limitations. Heterogeneous catalysts allow easy separation of the reaction media and have the possibility of reuse in several cycles. In this work, [CTA+]MCM-41 molecular sieves were synthesized and characterized by several methods (XRD, SEM, TGA and BET) to be applied in the methanolysis of soybean oil. The resulting materials were characterized as mesoporous solids of type IV with similar textural properties and thermal stability. The catalytic activity of [CTA+]MCM-41 in soybean oil methanolysis was analyzed by gel permeation chromatography (GPC) and the best solid catalyst was applied in a factorial design that was validated by Analysis of Variance (ANOVA). The oil:methanol molar ratio and the catalyst concentration were the variables with the highest statistical effects, with the latter showing a quadratic profile in relation to the response function. The best conversion was achieved at 343 K, 30 min and 3.75 wt % catalyst, which corresponded to a product with 99.2% in fatty acid methyl esters. Calcination caused a total loss in catalytic activity due to the removal of CTA+ cations from the mesoporous solids. Hence, such activity was associated with the formation of (SiO-)(CTA+) ion pairs at the surface of the solid catalyst

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