Curcas Biodiesel Research Articles

A Comprehensive exploration of jatropha curcas biodiesel production as a viable alternative feedstock in the fuel industry – Performance evaluation and feasibility analysis

Jatropha Curcas stands out as a promising plant-based feedstock, offering a non-edible oil that holds great potential as an alternative fuel to traditional diesel. Notably, Jatropha oil boasts favourable fuel properties, including a higher oil content compared to other alternatives. This attribute makes it an attractive candidate for biodiesel production. Importantly, as a non-edible oilseed feedstock, Jatropha Curcas helps mitigate concerns related to food prices and the ongoing food versus fuel debate, offering a sustainable solution to the growing energy demands. Furthermore, the plant exhibits impressive yields, with the potential to produce up to 40% oil weight per seed. This high yield not only enhances the economic viability of Jatropha-based biodiesel but also underscores its efficiency as a feedstock. The discussion extends beyond mere fuel properties, encompassing a comprehensive comparative review that delves into engine performance and emission characteristics associated with Jatropha Curcas. The novelty of this paper lies in its exploration of the crude oil aspects of Jatropha curcas, shedding light on an essential facet often overlooked. By presenting a thorough analysis of fuel properties, engine performance, and emission characteristics, the paper contributes valuable insights to the discourse on sustainable energy solutions. Moreover, it goes beyond technical aspects and provides perspectives on the current economic status, offering a holistic view of the potential impact of Jatropha Curcas in the broader context of renewable energy and economic development.

Comparative study of calorific value of rapeseed, soybean, jatropha curcas and crambe biodiesel

Biodiesel is a mixture of esters of short chain alcohols, produced as an alternative fuel for mineral diesel substitution. It is originated from renewable sources (fats and oils) and is less pollutants. But for its implementation, it is necessary to analyze some important quality parameters. A very important fuel`s feature is the calorific value, which represents the amount of heat transferred into the chamber during the combustion and indicates the available energy in fuel. The calorific value is obtained experimentally using a calorimetric bomb. The higher the calorific value, the higher is the yield of the fuel. The aim of this study is to determine the calorific value of rapeseed, soybean, jatropha curcas and crambe biodiesel using a calorimetric bomb. The results were associated with the ethyl ester composition of each biodiesel. The crambe biodiesel shows the highest calorific value (∆H= 40564 J g-1) influenced by the high amount of long chain ethyl ester originated from behenic acid (C22:0) that composes 57.2% of crambe oil. The rapeseed, soybean and jatropha curcas biodiesel that exhibit approximately the same amount of long chain ethyl ester showed calorific values near to ∆H= 39450 J g-1.

Evaluation of the Rate of Reduction of Greenhouse Gases from Diesel Engine Powered with Jatropha Curcas Seed Oil Blend Diesel

As part of the effort to reduce greenhouse gases emissions and lower its negative effects on climate change, this study was conceived with the aim of evaluating the rate of reduction of greenhouse gases emission from diesel engine powered with Jatropha Curcas seed oil blend diesel. The study produced biodiesel from the oil extracted from the Jatrophha Curcas seed using trans-esterification method. The amount of CO2, SO2 and NO2 emitted from a diesel engine powered with conventional oil and jatropha biodiesel blend were determined to ascertain whether there was reduction or increment in percentage of emissions. Laboratory analysis of Jatropha Curcas oil shows that 131.9524g jatropha curcas seed yielded 90.559ml of biodiesel and 41.2437ml of glycerol. Conventional diesel and Jatropha curcas biodiesel produced has similar physiochemical characteristics confirmed through ASTM(US) and DIN(EN) hence their combustibility. CO2 emissions increased with increase in diesel at B100 and B50 while it decreases in B20 and B40. While NO2 emissions increased by 1% in all the revolutions per minute, SO2 was only detected at B100 and B50 emission of the greenhouse gases. From the questionnaire survey conducted at Egbema, it was found that gas flaring has serious adverse effect on vegetation in the area, significant negative effect on the economy of the area due to the rise in air pollution. The result of the laboratory experiments showed that blended green diesel reduces the emission of greenhouse gases from combustion of diesel. The study recommended adoption of renewable energy sources for the operation of the oil firms in Egbema the study therefore concluded that blended green diesel is a promising alternative fuel for internal combustion engines.

Effect of phospholipids on the premixed combustion behavior of Jatropha curcas biodiesel

Effect of phospholipids on the premixed combustion behavior of Jatropha curcas biodiesel

Impact of binary blends of biodiesels on fuel quality, engine performance and emission characteristics

AbstractThe incessant pressure of energy requirements by the growing global populace has led to the exploration of unconventional methods to produce renewable and sustainable fuels. Among these, biodiesel is most suited to the present needs of eco-friendly standards to keep the atmosphere free from residual emissions. Various fuel-modification methods were developed over a couple of decades to make biodiesel suitable for diesel engines. In the present research, Jatropha curcas biodiesel and waste-cooking-oil (WCO) biodiesel were used to craft a unique binary blend to obtain desirable fuel properties and operational suitability for the diesel engine. The blend with 80% WCO biodiesel and 20% J. curcas biodiesel, which had the most suitable fuel properties, was tested on a four-stroke single-cylinder vertical diesel engine. The emissions and operational parameters were analysed and compared with diesel. The results of the study indicated that engine emissions for binary blend, carbon monoxide and unburnt hydrocarbon emissions were highly reduced, and carbon dioxide and nitrogen oxide (NOx) emissions increased relative to diesel. At full load, NOx emission was found to be 51.32% higher than that from diesel and 3.8% lower than that from WCO biodiesel. Engine performance showed that for the binary blend, at full load, the brake-specific fuel consumption was 396.82 g/kWh, which was 15.26% higher, and the brake thermal efficiency was 22.7%, which was 2.74% lower than regular diesel fuel. The present study suggests that the binary blend of J. curcas biodiesel and WCO biodiesel can be a promising approach towards advancements in the fuel properties of biodiesels.

Thermogravimetric and combustion efficiency analysis of Jatropha curcas biodiesel and its derivatives

Thermal behavior of diesel, Jatropha curcas methyl ester (JOME), and its B20 blend (20% biodiesel and 80% diesel) are examined from the profiles of thermogravimetry – differential scanning calorimetry (TG-DSC) under air. TG profiles of samples indicate the mass loss steps to volatilization and combustion of methyl esters. Due to the higher temperature combustion of the intermediate stable compounds that are formed, the peak temperature of combustion is high for JOME compared to diesel and B20 blend. DSC profiles of diesel and B20 JOME indicate an endothermic peak associated with the vaporization of methyl esters for B20 JOME and the volatilization of a small fraction of the diesel. The ignition temperature for diesel and B20 blend is 128 °C, whereas JOME has an ignition temperature of 220 °C. The burnout temperatures for the diesel, JOME, and B20 blend are 283.24, 470.02, and 376.92 °C, respectively. The ignition index for the B20 blend was found to be 73.73% more compared to diesel. The combustion index for the B20 blend was found to be 37.81% higher compared to diesel. The B20 blend exhibits high enthalpy, better thermal stability, and a reduced peak temperature of combustion, with an improved combustion index and an intensity of combustion making it nearly comparable with diesel.

Impact of adding EDA in Jatropha and Waste cooking oil biodiesel on NOx reduction in diesel engine emission

ABSTRACT Biodiesel usage in diesel engines is generally accepted as comparable fuel. To improve the quality of biodiesel, several fuel additives are used. In the present research, ethylenediamine (EDA) was used as an additive in Jatropha curcas biodiesel (JCB) and Waste cooking oil biodiesel (WCB) to reduce the nitrogen oxides (NOx) emission. Different blends of JCB and WCB with diesel have been prepared with and without EDA and tested on a vertical, 4-stroke, single-cylinder diesel engine. Results showed that by using 0.02% (by weight) EDA additive in WCB10 and JCB10 blends, NOx and carbon dioxide emissions were reduced by nearly 5% and 1.5% respectively. However, small rise in carbon mono-oxide (∼1%), unburnt hydrocarbon (∼0.7%), brake specific fuel consumption (∼0.26%) and a slight reduction in brake thermal efficiency (∼0.5%) were observed. The blends WCB10 and JCB10 with 0.02% EDA additive could be alternative fuels for diesel engines without modifying the existing engine.

Role of injection pressure on fuel atomization and spray penetration on the Thevetia peruviana and Jatropha curcas biodiesel blends with nanoparticle

This study investigates the effect of the injection pressure on the spray characteristics and atomization of the fuel. The novelty of the work lies in examining the injection pressure (IP) at four different scenarios such as 180 MPa, 200 MPa, 220 MPa and 240 MPa. A series of test conducted in the single cylinder engine at three different concentrations of B10 (5% Jatropha curcas and 5% Thevetia peruviana-50 ppm of Fe2O3), B20 (5% Jatropha curcas and 5% Thevetia peruviana-50 ppm of Fe2O3) and B30 (5% Jatropha curcas and 5% Thevetia peruviana-50 ppm of Fe2O3). All the samples were tested for performance and emission characteristics. Based on the procured results, the combination of the dual biodiesel blends improvised the production of higher brake power and lowered specific fuel consumption. Adding two blends together reduced the overall viscosity of the Thevetia peruviana (yellow oleander oil) since the viscosity of the jatropha is lower than the yellow oleander oil. As the concentration of the blends is increased there is a marginal drop in the brake thermal efficiency, however there is an improvement in the brake specific fuel consumptions. In terms of the combustion efficiency, the heat release rates were improvised upon addition of Fe2O3. With regard to the emissions, there is no significant change in the NOx. Nevertheless, there is a drastic reduction in the HC and CO formation has been witnessed. Among various blends, B30 at 240 MPa of IP reported lower emissions than B10 and B20. In order to examine the fuel atomization and spray characteristics, numerical modelling was applied. At 240 MPa, the fuel mixing rates were higher compared to the other injection pressure.

CaCO3-derived from eggshell waste for improving the corrosion resistance of zinc composite coating on mild steel for biodiesel storage tank

Sustainability of energy does not end in the generation of biofuels, but as well encompasses proper mitigation of the metallic equipment used in the plant from corrosion degradation. Corrosion of metallic equipment in biodiesel plants limits the storage and distribution of biodiesel to the end-users. Carbon steel of Mild steel type/grade is one of the major metallic materials used in the construction of biodiesel storage tanks. The major setback of using mild steel for biodiesel storage is the high corrosion rate. This research aims to develop a novel coating of mild steel using CaCO3 derived from eggshell waste (ESP). The Codeposition method was used to develop Zn-10%CaCO3-ESP (single and double layer). The corrosion of the samples was tested in a Jatropha curcas biodiesel (JBD) environment. Microstructure, hardness values, viscosity, and density of the oil were determined. A corrosion protection efficiency of 68.87% was obtained using the Zn-10%CaCO3-ESP double layer. High corrosion damage as a result of localized pitting corrosion mechanism was observed for the mild steel without coating. This novel coating can be used in the industrial fabrication of storage tanks for biodiesel since the CaCO3-ESP is prepared by a simple method.

Impact of Temperature on the Spray Characteristics of Jatropha Curcas Biodiesel and Diesel Fuel Blends

Abstract There is an increasing demand of energy because of an increase in the number of vehicles with internal combustion engines, because of which industrial and automotive fields are concerned about fossil fuel depletion, environmental issues, and energy conservation. These challenges force the world to explore other alternative sources of energy. The extensive use of biodiesel as compression ignition engine fuel has further compelled the researchers to regulate the emission and improve the engine performance. Fuel spray behavior affects mixture formation, and this affects engine combustion and performance. This research work involves the evaluation of the relationship between spray parameters of used Jatropha curcas biodiesel fuel, including spray penetration, cone angle, and preheating temperature, compared with diesel fuel, conducted at ambient condition. In addition to this, the high-speed spray pattern photography is undertaken by using single-hole and multi-hole injectors. The spray behavior is analyzed through spray parameters such as spray cone angle and spray penetration for all test fuels. The fuel temperature has a strong relationship with spray behavior at high temperatures; as the fuel temperature increases, the spray tip penetration decreases due to the evaporation of the fuel having a low boiling point and good fuel atomization, which leads to smaller droplets and an increase in spray cone angle with the increase in temperature.

A Study on the Corrosion Characteristics of Internal Combustion Engine Materials in Second-Generation Jatropha Curcas Biodiesel

The corrosiveness of biodiesel affects the fuel processing infrastructure and different parts of an internal combustion (IC) engine. The present study investigates the corrosion behaviour of automotive materials such as stainless steel, aluminium, cast iron, and copper in 20% (B20) and 30% (B30) by volume second-generation Jatropha biodiesel using an immersion test. The results were compared with petro-diesel (B0). Various fuel properties such as the viscosity, density, water content, total acid number (TAN), and oxidation stability were investigated after the immersion test using ASTM D341, ASTM D975, ASTM D445, and ASTM D6751 standards. The morphology of the corroded materials was investigated using optical microscopy and scanning electron microscopy SEM), whereas the elemental analysis was carried out using energy-dispersive X-ray spectroscopy (EDS). The highest corrosion using biodiesel was detected in copper, while the lowest was detected in stainless steel. Using B20, the rate of corrosion in copper and stainless steel was 17% and 14% higher than when using diesel, which further increased to 206% and 86% using B30. After the immersion test, the viscosity, water content, and TAN of biodiesel were increased markedly compared to petro-diesel.

Study on the mechanism of auto-oxidation of Jatropha biodiesel and the oxidative cleavage of C[sbnd]C bond

Jatropha biodiesel was obtained according to the continuous preparation process which included vapor esterification - transesterification - methanol steam distillation. Accelerated oxidation of small Jatropha biodiesel was obtained by the Rancimat method. GC–MS and liquid phase micro-extraction were used to study and analyze the components in the oxidation process of Jatropha curcas biodiesel. The electronic effects of the related reactants and products were calculated by density functional theory, followed by the deduction of the related chemical reaction paths. Experimental investigation shows that methyl linoleate is the main factor affecting the oxidation stability of the Jatropha biodiesel. The main volatile products at the initial stages of the oxidation of methyl linoleate are hexanal, methyl octanoate, styrene, and 2-heptenal. The cis/trans-3-octyl-oxiranyl octanoic acid methyl ester (18.03% yield) is produced by the reaction of peroxy acid and methyl oleate during the oxidation of methyl oleate. The hydrogen extraction reaction is difficult to occur, and the oxidation reaction energy barrier is relatively high due to the relatively large bond energy of the CH bond in the methyl stearate molecule. In this manuscript, the auto-oxidation mechanism of the biodiesel fatty acid methyl esters at the initial stage of oxidation, the path of oxidative cleavage of the CC bond of Jatropha biodiesel and the formation process of ethylene oxide structure are obtained through DFT calculation and analysis of the oxidation products.

Determination of total phosphorus in biodiesel by ion chromatography

Phosphorus content in biodiesel is an important parameter for evaluating its quality. In this paper, the total amount of phosphorus in biodiesel was determined by Ion Chromatography (IC) with on-line matrix elimination function. An effective and safe sample pretreatment method and IC quantification method were adopted. The method has good linear correlation (r = 0.9998), low detection limit (Cmin = 0.007 mg L−1) and reasonable reproducibility. By measuring the residual carbon of biodiesel ashing products at different temperature points as an index of ashing degree, phosphate from biodiesel ashing products at different temperature points was determined by IC; the optimum ashing temperature was 680 °C. At 680 °C, the amount of phosphorus in Jatropha curcas biodiesel was determined by both IC and ICP-OES; the measured phosphorus content was 13.53 mg·kg−1 and 11.25 mg·kg−1, respectively, and exceeded the national standard of 10 mg·kg−1. In addition, the phosphorus content of soybean oil biodiesel was tested by IC at different ashing temperatures. Those results showed that at 680 °C, the biodiesel phosphorus content in soybean oil was 5.41 mg·kg−1, lower than the 10 mg·kg−1 stipulated by ASTM D 6751 and GB 25199, but higher than the 4 mg·kg−1 stipulated by EN14214.

Effect of Hydrogen Enrichment Strategy on Performance and Emission Features of Biodiesel-Biogas Dual Fuel Engine Using Simulation and Experimental Analyses

Abstract In the present work, hydrogen enrichment in biogas is studied as a potential approach to improve the performance and emission features of a biodiesel-biogas dual fuel engine. A single-cylinder diesel engine is modified to operate in dual fuel mode using Jatropha curcas biodiesel as the pilot fuel and biogas as the main fuel. An electronic control unit is developed in-house to study 5−20% hydrogen enrichment in biogas using the timed manifold injection (TMI) technique. A three-dimensional computational fluid dynamics-based simulation methodology is presented for optimal selection of TMI parameters to ensure efficient and safe operation of the engine. Subsequently, the optimized injection conditions are used for the experimental evaluations, which are performed for performance and emission characteristics of the engine at low and high engine loads. Engine performance is analyzed based on energy and exergy analyses, whereas hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx), and smoke emissions are analyzed for emission characterization. The simulation results show that the injection angle and injection pressure influence in-cylinder mixture formation and hydrogen accumulation in the intake manifold. A combination of injection angle = 60 deg and injection pressure = 150 kPa offers good mixture formation. Experimental results show that at 20% hydrogen enrichment, exergy efficiencies of the dual fuel engine are increased from 8.4% to 10.1% at low load and 23.3% to 25.5% at high load. However, maximum reductions in HC and CO emissions of 35.6% and 50.0%, respectively, are calculated at low load.

Microwave assisted Jatropha curcas biodiesel production and the effects on the diesel engine performances

Experimental investigation was conducted to examine the methyl ester production of high free fatty acid (FFA) of Jatropha Curcas oil (JCO) using waste white clams as catalyst. The waste clams were calcined at 900°C for 4 hours and was characterized using scanning electron microscopic (SEM), X-ray diffraction (XRD) and X-ray fluorescent (XRF). A two-step transesterification process via microwave heating was selected to perform the production. The study showed that the microwave power input grants the separation process improvement and enhancing the reaction rate at 450 Watt for 7 minutes of reaction time under optimal conditions of 9:1 methanol molar ratio and 5% catalyst loading. A highest biodiesel yield methyl ester was reached up to 93.6%. The engine performances characteristics were carried out with an unmodified direct injection single cylinder diesel engine with variable load and engine speed fuelled with 10% (JCOB10) and 20% (JCOB20) of JCO blended with diesel and compared with standard petroleum diesel. The results indicated that JCOB10 shows similar behaviour like petroleum diesel compared with JCOB20.

Densities and excess molar volumes of mixtures containing diesel, biodiesel and alkanols at temperatures from 288.15 to 313.15 K

The present work is focusing on the synthesization and physico-chemical properties of Jatropha curcas biodiesel with diesel and alcohols. The densities of binary diesel (2) + 1-alkanols (C 3 or C 4 ) (3) and ternary Jatropha curcas biodiesel (1) + diesel (2) + 1-alkanols (C 3 or C 4 ) (3) blends have been reported over full range of composition at temperatures within range 288.15 to 313.15 K. Also densities of Jatropha curcas biodiesel (1) + diesel or 1-alkanols (C 3 or C 4 ) (2) blends have been measured at 313.15 K. Excess molar volumes, V E , V 123 E of binary and ternary blends were calculated from the measured data and the derived properties were correlated to composition using Redlich–Kister equation. A reasonable agreement was found between the measured and estimated values. Further, densities and excess molar volumes data were reasoned to discuss molecular interactions taking into consideration effect of composition and temperature.

Evaluating the feasibility of diethyl ether and isobutanol added Jatropha Curcas biodiesel as environmentally friendly fuel blends

The present research work aimed to analyse the performance and emission characteristics of a single cylinder, air cooled, compressed injection diesel fuelled with Jatropha methyl ester blends with Diethyl Ether (DEE) and Isobutanol (IB) additives. Each additive was added in the proportion of 5% and 10% by volume. Experiments were conducted with diesel, B20 and B30 JME (Jatropha Methyl Ester) blends added with selected additives. With these additives, the fuel properties improved. The engine test results showed an improvement in all the performance and emission characteristics with the fuel added and with additives. B20 + 10% DEE showed a better specific fuel consumption, brake thermal efficiency and lower NOx emissions. B30 + 10% IB had shown better CO, CO2 and O2 emissions.

Utilization of renewable and sustainable basic heterogeneous catalyst from Heteropanax fragrans (Kesseru) for effective synthesis of biodiesel from Jatropha curcas oil

This study explores the application and efficacy of the green catalyst derived from Heteropanax fragrans in the production of Jatropha curcas biodiesel. The catalyst was prepared by calcination of the ash at 550 and 850 °C for 2 h. Powder-XRD, BET, FT-IR, FESEM, EDX, XPS and HRTEM were employed for catalyst characterization. The characterization indicated that among the various metals present, potassium was found to be the highest being 14.69 wt% in UHC (uncalcined H. fragrans catalyst), 19.05 wt% in the CC-550 (catalyst calcined at 550 °C), and 19.27 wt% in the CC-850 (catalyst calcined at 850 °C). The BET analysis of UHC, CC-550 and CC-850 showed the appreciable surface areas of 96.57, 27.50, and 78.45 m2 g−1, respectively. The CC-550 with the highest basic character (pH value = 12.89 at 1:5 w/v) is exhibiting better performance producing a high biodiesel yield of 97.75% in 65 min with TOF (Turnover frequency) of 35.55 min−1 compared to the CC-850 (96.58%, 115 min) and UHC (96.61%, 110 min) with TOF of 27.71 and 29.47 min−1, respectively at the optimum experimental conditions of 12:1 MTOR (methanol to oil ratio), and 7 wt% of catalyst at 65 °C. Hammett method showed stronger basicity of CC-550 (0.423 mmol/g) representing the better efficacy for the catalysis in comparison to that of CC-850 (0.303 mmol/g) and UHC (0.298 mmol/g). The catalyst is reusable which could produce a high biodiesel yield (90.22%) even in the 3rd reaction cycle. The activation energy of H. fragrans catalyzed biodiesel synthesis is found to be 32.31 kJ mol−1. FT-IR, NMR, and GC–MS techniques were used to characterize J. curcas biodiesel. The properties of J. curcas biodiesel were found to be within the limits of international standards. The prepared catalyst is an environmental-friendly, renewable, inexpensive and highly efficient base catalyst. Thus, the utilization of this catalyst for biodiesel production will add an aspect in the biorefinery for exploring sustainable raw materials with the overall capacity of reduction in biodiesel-cost.

Financial assessment, performance and emission analysis of Moringa oleifera and Jatropha curcas methyl ester fuel blends in a single-cylinder diesel engine

The decreasing of natural capitals such as fossil fuel has ready it crucial to change finished to alternative. In the present investigation the possible biodiesel is obtained from Moringa oleifera and Jatropha curcas oils. The fuel properties of Moringa oleifera and Jatropha curcas methyl esters were presented, and their 20, 40 and 60% by volume blends (MOB20, MOB40, MOB60 and JB20, JB40, JB60) were compared with diesel fuel (D100). The performance, combustion and emission of these fuel blends were evaluated in a single-cylinder diesel engine. The engine was operated at 1500 rpm engine speed with compression ratio 18.5 and advanced fuel injection timing of 23° before top dead center at various loads (25%, 50%, 75%, and 100%). The results show that both the alternative fuels (Moringa oleifera and Jatropha curcas) produce lower amount of oxides of nitrogen (NOX) emissions as compared to diesel fuel. At 100% load, 20% blend of moringa oleifera and Jatropha biodiesel show lower NOX emission by 12.39%, which was reduced by 11.25% for Moringa oleifera and Jatropha blend (B20) when compared with diesel fuel. The study reveals that the Jatropha blend decreases smoke emission by 6.98% and CO2 by 6.67% when compared with diesel fuel. It also causes a significant reduction in combustion duration, but improved cylinder temperature. Jatropha curcas biodiesel is better than Moringa oleifera in the aspect of engine characteristics. The cost analysis for Jatropha and moringa oleifera biodiesel was performed accomplished and the market value were evaluated as INR 76 and 68, respectively.

Kinetics of Oxidation Decomposition on Jatropha Curcas Biodiesel

High free fatty acid jatropha curcas oil was use as a feedstock of biodiesel through two step esterification, first by reaction of Jatropha curcas oil with methanol catalyzed by sulfuric acid, and second step is transesterification process with methanol catalyzed by sodium hydroxide. After purification step, 120 ppm pyrogallol was introduced into Jatropha curcas biodiesel. Accelerated controlled oxidation process was performed using rancimat test equipment with the dry airflow to the reaction tube is 10 L/min. Assuming that oxygen only reacts with double bond of the compound that compose biodiesel, measurement the quantity changes of double bond on biodiesel by the changes of the value of iodine number will brought to the rate of reaction. While reaction rate constant determine by Arrhenius law was calculated from the data of time to reach induction period in a certain temperature. It was found that total rate of oxidation process was determined by chemical reaction rate rather than mass transfer rate of oxygen to the body of biodiesel, both on biodiesel with or without pyrogallol. While in a presence of 120 ppm pyrogallol on jatropha curcas biodiesel, Arrhenius constant was determined by the value of frequency factor (A) = 28.47 x 106/sec and activation energy (E) = 97,31 kJ/mol. This mean that on the ambient temperature 30 oC, Jatropha curcas biodiesel in a presence of 120 ppm pyrogallol will decrease their iodine value 3.4% after 2.3 years.