Biodiesel Conversion Efficiency Research Articles

Biofuel production utilizing black soldier fly (Hermetia illucens): a sustainable approach for organic waste management

This study investigates the potential of biodiesel production from Black Soldier Fly (BSF) larvae using organic waste. The aim of this research is to assess the feasibility of biodiesel production and its economic viability from BSF larvae. Specific objectives include analyzing organic waste quantity, moisture content, dry matter, BOD content, and biodiesel conversion efficiency. Our findings reveal that under various scales, biodiesel production from BSF larvae shows promise. For instance, in a small-scale urban biofuel plant, we estimate the production of approximately 122.73 liters of biodiesel per day from 1 ton of organic waste. Moreover, our calculations demonstrate the potential for medium-scale rural and large-scale industrial biofuel plants to produce 1,678.85 and 22,272.73 liters of biodiesel per day, respectively. These results highlight the significant biodiesel potential of BSF larvae. In conclusion, this study provides valuable insights into the biodiesel production potential of BSF larvae. It underscores the feasibility of utilizing organic waste for biodiesel production, contributing to sustainable biofuel development. Our research contributes to the knowledge base by offering quantitative assessments of biodiesel potential. We have incorporated quantitative data to provide a clearer understanding of the biodiesel potential and its economic implications.

Utilization of iron fillings solid waste for optimum biodiesel production.

This study explores the innovative application of iron filings solid waste, a byproduct from mechanical workshops, as a heterogeneous catalyst in the production of biodiesel from waste cooking oil. Focusing on sustainability and waste valorization, the research presents a dual-benefit approach: addressing the environmental issue of solid waste disposal while contributing to the renewable energy sector. Particle size distribution analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), Thermal analysis (TG-DTA), and FTIR analysis were used to characterize the iron filings. The response surface methodology (RSM) was used to guide a series of experiments that were conducted to identify the optimum transesterification settings. Important factors that greatly affect the production of biodiesel are identified by the study, including catalyst loading, reaction time, methanol-to-oil ratio, reaction temperature, and stirring rate. The catalyst proved to be successful as evidenced by the 96.4% biodiesel conversion efficiency attained under ideal conditions. The iron filings catalyst's reusability was evaluated, demonstrating its potential for numerous applications without noticeably decreasing activity. This work offers a road towards more environmentally friendly and sustainable chemical processes in energy production by making a strong argument for using industrial solid waste as a catalyst in the biodiesel manufacturing process.

Synthesis and characterization of chitosan/polyvinyl alcohol immersed in sodium hydroxide thin film as a heterogeneous catalyst in biodiesel production

Biodiesel is a potential renewable energy source that can be used to replace fossil fuels because of its low toxicity, biodegradability, and renewability. However, biodiesel production requires long reaction times. Hence, a catalyst is needed to speed up the reaction and optimize production conditions. CS/PVA thin film catalyst immersed in NaOH has intriguing catalytic properties that can improve biodiesel conversion efficiency. In this paper, a series of chitosan/polyvinyl alcohol‑sodium hydroxide (CS/PVA-NaOH) thin films have been prepared as heterogeneous catalysts in biodiesel production. According to the FTIR spectra data, It shows that the vibrational frequency of the hydroxyl group (-OH) shifted from 3271 cm−1 to 3290 cm−1, indicating the hydrogen bond interaction between chitosan and PVA. Water uptake (45.42–218.64 %), swelling (120.63–142.99 %), porosity (62.67–243.43 %), and the durability of the thin film at pH conditions of 5–11 have been found to be the physicochemical characteristics of blended Chitosan/PVA (4/1; 3/2; 2.5/2.5; 2/3; 1/4 (v/v)). The optimal conditions for producing biodiesel were found to be around 65 °C for 90 min with an oil: methanol molar ratio of 1:7. By using a heterogeneous catalyst of CS/PVA-NaOH, the conversion efficiency from oil to biodiesel was achieved at around 95.39–99.52 %.

Life cycle assessment: Sustainability of biodiesel production from black soldier fly larvae feeding on thermally pre-treated sewage sludge under a tropical country setting

More energy is needed nowadays due to global population growth. Concurrently, sewage sludge generation has also increased steadily stemming from the inevitable urbanization. As such, black soldier fly larvae (BSFL) can be potentially deployed to solve both issues. This paper investigates the environmental sustainability of biodiesel production derived from sludge-fed BSFL feedstock. A cradle-to-gate life cycle assessment (LCA) was performed through SimaPro software utilizing the ReCiPe 2016 Midpoint (H) and Endpoint (H) methods. The entire LCA covered 3 main stages, including the thermal pre-treatment of sludge, BSFL rearing and processing, and lastly lipid extraction and biodiesel production. LCA showed that the sludge pre-treatment stage had the highest environmental impact, while BSFL rearing and processing had the least due to the suitable geographical climate. Electricity usage during the pre-treatment stage was the main contributing component, followed by chemical usage during biodiesel production. After normalizing, it was observed that land occupation, marine ecotoxicity, freshwater ecotoxicity and freshwater eutrophication were more impactful than the commonly studied global warming potential (GWP). Lipid content and biodiesel conversion efficiency were determined as the sensitive factors which could influence the LCA outcome. In comparison with other types of biodiesel, BSFL biodiesel had a milder impact in terms of climate change, land occupation, terrestrial acidification, marine and freshwater eutrophication. Furthermore, this biological reduction of sludge through BSFL valorization avoided sludge landfilling, which reduced up to 100 times GWP. Therefore, sludge-fed BSFL biodiesel production is an environmentally-sound and highly potential solution that should be investigated comprehensively.

Design of a sodium peroxide/sulfonic acid functionalized SBA-16 bi-functional catalyst for improving the conversion of waste cooking oil to biodiesel

A sodium peroxide/sulfonic acid-functionalized SBA-16 (Na2O2/SBA-16-SO3H) bifunctional catalyst was successfully developed to improve the conversion of waste cooking oil (WCO) to biodiesel. High-resolution X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and Fourier transform infrared spectroscopy analysis results showed that 3D cubic mesoporous SBA-16 and SBA-16-SO3H were successfully synthesized through a hydrothermal reaction and that the 3D cubic mesoporous structure of SBA-16 was not damaged after modifying the Na2O2 particles and -SO3H functional groups. The results of the activity tests showed that modifying SBA-16 with Na2O2 as the alkali catalyst and the -SO3H group as the acidic catalyst could remarkably accelerate transesterification and esterification reactions simultaneously, resulting in an increased conversion efficiency of WCO to biodiesel. The biodiesel conversion efficiency of Na2O2/SBA-16-SO3H reached 81% after a 6 h reaction, which is approximately 3.5 times higher than that of SBA-16. Moreover, the results show that increasing the methanol/WCO molar ratio from 6:1 to 18:1 inhibited saponification and accelerated the transesterification and esterification reactions, shortening the reaction time for fatty acid methyl ester conversion from 8 h to 4 h, providing possibilities for practical application in the future. The Na2O2/SBA-16-SO3H catalyst showed optimal activity when the free fatty acid content was controlled at 3%, the methanol/WCO ratio was controlled at 18:1, and the biodiesel yield reached 93% after 4 h of reaction.

Study on Performance and Emission of Diesel Engine Using Palm Oil Biofuel-Diesel Blends

The addition of biofuel to diesel increases the fuel's stability, density, viscosity, energy content, and cetane number Blending biodiesel and diesel improves the viscosity of the combined fuel in comparison to diesel fuel. Recently, studies on optimizing the use of biodiesel diesel fuel have begun to examine the effects on diesel engine components and the energy conversion efficiency of biodiesel fuel use. The addition of supplements from other natural fuels is an effective option to improve energy conversion efficiency, but the blending effect causes changes in fuel properties. Therefore, further analysis is needed to meet the fuel standards used in diesel engines. This study is to obtain a clearer analysis of the effect of biofuel addition on diesel engine performance and exhaust emissions. Measurements of experiment variables such as Torque, thermal efficiency, power, bsfc, and gas emission obtained from sensors installed in each part of the laboratory scale of diesel engine. The result shows blends of biofuel and diesel can be used as alternative fuels in conventional diesel engines. The variation of power generated by both of fuel mixture shows average power without any major changes. The thermal efficiency of 30% biofuel average is better across all engine speed variations whereas the carbon monoxide variation decreases towards the same amount at 3000 rpm.

Optimization of biodiesel production parameters from Prosopisjuliferaseed using definitive screening design

The concept of waste to valuable products is a hot topic with more explorations going on worldwide to minimize the environmental pollution and wastage of food-based feedstocks. In this work, biodiesel was produced from Prosopis julifera seed oil using ethanol as solvent and magnesium oxide nanocatalyst and the process was optimized by employing an advanced statistical optimization method; definitive screening design. The maximum biodiesel yield from Prosopis julifera seed was found to be 32.5%. Acid esterification and transesterification were applied to minimize the acidity. Acidity of the P. julifera oil was initially reduced to 1.52 mg KOH/g using acid catalyst H2SO4, and then to 0.88mg KOH/g by transesterification process using magnesium oxide.Optimum biodiesel conversion efficiency of 94.83% was achieved under 10:1 ethanol-to-oil ratio, 5% magnesium oxide concentration, 80 min reaction time, 45 °C reaction temperature and 1000 rpm agitation rate. The transesterification reaction was found to be highly affected by the ethanol-to-oil ratio and catalyst concentration. The results showed that the catalytic activity of the magnesium oxide was sufficient for the production of biodiesel from P. julifera seed oil.The fuel properties were evaluated according to ASTM standards. FTIR analysis confirmed the existence of functional groups with respect to the fingerprint region of P. julifera ethyl esters. The Definitive screening design method can be suggested as an alternative method for the optimization of process parameters within limited materials and number of experiments. The findings suggest that this method of production of biodiesel from P. julifera seed oil shall open up new possibilities for a novel natural biofuel.

Synthesis of hierarchical flower-shaped hollow MgO microspheres via ethylene-glycol-mediated process as a base heterogeneous catalyst for transesterification for biodiesel production

Hierarchical flower-shaped hollow MgO (f-MgO) spheres were synthesized through an ethylene-glycol-mediated polyol process via hydrothermal reactions. The structure of f-MgO originates from intermediate flower-shaped Mg glycolate through the Ostwald ripening process. The surface of f-MgO consists of uniform petal-like nanosheets that provide high surface area and excellent accessibility to catalytic sites. Also, the f-MgO microsphere can prevent aggregation and stacking problems of nanosheets and control a surface area for catalytic activity. The morphology and structure of f-MgO were investigated using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The density of basic catalytic sites was derived from CO2-temperature-programmed desorption measurements. The f-MgO exhibits a basic site density of 0.5134 mmol/g, which is much higher than that of commercial MgO (c-MgO, 0.0288 mmol/g). Experimental results for the fatty acid methyl ester revealed that the catalytic strength of f-MgO as a heterogeneous catalyst for biodiesel production is greater than that of c-MgO. The maximum biodiesel conversion efficiency of f-MgO from canola oil is 93.4%, which is greater than the value of 91.4% for c-MgO.

Utilization of Cacao Pod Husk (Theobroma cacao l.) as Activated Carbon and Catalyst in Biodiesel Production Process from Waste Cooking Oil

Cocoa pod husk (Theobroma cacao l.) is a waste from cocoa beans processing. In this research we employ cocoa pod husk as activated carbon to decrease the value of FFA (Free Fatty Acid) in waste cooking oil and as K2CO3 catalyst in biodiesel production process from waste cooking oil. Cocoa pod husk was crusched and grounded into powder that passed thorugh 60 mesh-screen. As activated carbon, cocoa pod husk was firstly carbonized at three variant temperatures i.e 250°C, 300°C and 350°C. The activation process was done using HCl 2M as activator. Based on the results of XRD and FTIR, the carbonization at all variant temperatures does not cause a significant changes in terms of crystallite structure and water content. The pore of activated carbon started to form in sample that was carbonized at 350°C resulting in pore diameter of 5.14644 nm. This result was supported by the fact that the ability of this activated carbon in reducing the FFA of waste cooking oil was the most pronounced one, i.e. up to 86.7% of FFA. It was found that the performance of cocoa pod husk’s activated carbon in reducing FFA is more effective than esterification using H2SO4 which can only decrease 80.8%. On the other hand, the utilization as K2CO3 catalyst was carried out by carbonization at temperature 650°C and extraction using aquadest solvent. The extraction of cocoa pod husk produced 7.067% K2CO3 catalyst. According to RD results the fraction of K2CO3 compound from the green catalysts is the same as the commercial (SAP, 99%) that is ≥ 60%. From the obtained results, the best yield percentage was obtained using K2CO3 catalyst from cacao pod husk extract, i.e. 73-85%. To cope with biodiesel conversion efficiency, a two-step process consisting pretreatment with activated carbon carbonized at 350°C and esterification with K2CO3 from cocoa pod husk catalyst was developed. This two-step process could reach a high conversion of 85%. From the results it was clear that the produced biodiesel fuel was within the recommended SNI 7182: 2015 standard.

Methyl transesterification of waste cooking oil using a laboratory synthesized reusable heterogeneous base catalyst: Process optimization and homogeneity study of catalyst

A novel heterogeneous base catalyst, potassium impregnated zinc oxide was synthesized via precipitation method. It was modified by impregnation method and was used for synthesis of biodiesel using waste cooking oil as feedstock. The synthesized catalyst was characterized using various sophisticated techniques. The catalyst having a K/Zn atomic ratio of 60:40 was calcined at 900°C, provided the highest catalytic activity. Effect of different reaction parameters on biodiesel conversion efficiency were scrutinized. The experimental results showed that highest biodiesel conversion of 98% was achieved at optimized reaction conditions, at catalyst loading of 2.5wt%, oil: methanol molar ratio of 1:18, 600rpm and 65°C for 50min reaction time. Kinetics of the transesterification reaction was studied at varying reaction temperature (45–65°C) and the reaction marked the highest rate constant at 65°C. The activation energy of the reaction was 14.54kJ/mol. The reusability and homogeneous contribution of the catalyst was examined and it was investigated that leaching of active components from catalyst into the reaction media was responsible for catalyst deactivation and homogeneity. The synthesis of biodiesel was ascertained by ATR-FTIR and NMR (1H and 13C) analysis.

Jatropha sotoi-nunyezii y Jatropha curcas, especies de Tamaulipas: una comparación desde la perspectiva de los biocombustibles

Las especies del género Jatropha se consideran una alternativa viable para la producción comercial de biodiésel, particularmente J. curcas. Recientemente se describió la especie J. sotoi- nunyezii, con distribución en el estado de Tamaulipas, pero se desconoce si es factible aprovecharla industrialmente. El objetivo del presente trabajo fue obtener y caracterizar la calidad y rendimiento del biodiesel obtenido a partir de J. sotoi-nunyezii, comparándolo con las variedades comerciales de J. curcas tóxica y no tóxica. El aceite de semillas de J. curcas tóxica, J. curcas no tóxica y J. sotoi-nunyezii fue transesterificado para producir biodiésel, y se determinó su composición química (ésteres metílicos de ácidos grasos) por CG-EM. Las semillas de J. soto-nunyezii tuvieron mayor contenido de aceite con respecto a las de J. curcas tóxica y no tóxica (43.5 %, 32.5 % y 33.3 % respectivamente). La eficiencia de conversión a biodiésel fue mayor en J. sotoi-nunyezii con un 87.2 %. La composición química del biodiésel de J. sotoi-nunyezii con respecto al de J. curcas (tóxica y no tóxica) mostró mayor concentración de ésteres metílico insaturados, particularmente linoleato de metilo. Esta característica influyó en los valores calculados de los parámetros de calidad, índice de yodo y número de cetano que comparado con normas de calidad como la EN 14214, indican que el biodiésel de J. sotoi-nunyezii es más susceptible a la oxidación con respecto al biodiésel de J. curcas (tóxica y no tóxica). Por otro lado, el valor calculado de la entalpía de combustión del biodiésel de J. sotoi-nunyezii y J. curcas (tóxica y no tóxica) es similar al del diésel, por lo que ambos valores indican que son biocombustibles con alto contenido energético. Esta comparación permitió considerar a J. sotoi-nunyezii como posible especie promisoria para la producción de biocombustibles de segunda generación.

The synthesis of biodiesel catalyzed by Mucor miehei lipase immobilized onto aminated polyethersulfone membranes

Nowadays, biodiesel has become more attractive in the quest for a novel fuel source due to its environmental benefits and the biodegradable properties. Transesterification of Helianthus annuus (sunflower) seeds oil is one of methodsacci for producing biodiesel fuel. However, during this process, the impurities are frequently found in the synthesized biodiesel which degrades the quality of biodiesel. Therefore, a proper catalyst is required to obtain the high-quality biodiesel. In this study, a series of aminated polyethersulfone (PES- $$\mathrm{NH}_2$$ ) membranes was prepared as solid support for immobilized Mucor miehei lipase. Glutaraldehyde was used as a cross-linker agent in immobilization process to investigate the effect of spacer toward biodiesel production. Based on elemental analysis, lipase was successfully attached onto PES- $$\mathrm{NH}_2$$ membranes and formed physical interactions. Enzyme loading values of synthesized membrane were higher than that of commercial filtration membrane. LC-MS analysis with C18 as a column showed that butyl palmitate, butyl linoleate, and butyl oleate were produced from transesterification reaction of triglyceride from sunflower oil and butanol. Based on FTIR analysis, the imine group as a covalent bond was successfully obtained during the cross-linking reaction. After reaction with the spacer, the enzyme loading was increased significantly from 177.05 to 911.48 μg/cm $$^2$$ . The alkyl esters produced also showed high values after the cross-linking. According to biodiesel quality tests, the results were matched with the values specified by the ASTM. Biodiesel from sunflower seeds oil was successfully synthesized through a transesterification reaction catalyzed by Mucor miehei lipase immobilized onto the synthesized aminated PES membrane. The addition of glutaraldehyde as a cross-linker showed an excellent enzyme loading value and led to significantly increased biodiesel conversion efficiency. This method is good to be developed, since the immobilized enzyme stability could be increased, the separation process was easier, and a high yield with good quality of biodiesel could be obtained.

Alkaline catalyzed biodiesel production from safflower (Carthamus tinctorius L.) oil: Optimization of parameters and determination of fuel properties

ABSTRACTIn this study, the process of biodiesel production from safflower oil was optimized using a single-stage alkaline catalyst (NaOH). The optimization process was carried out depending on parameters, such as catalyst concentration, methanol-oil ratio, reaction temperature, and reaction time. The optimum biodiesel conversion efficiency was obtained to be 93.4% at 0.5% catalyst concentration, 20% methanol-oil ratio, 60 min reaction time, and 60°C reaction temperature. The fuel properties of biodiesel obtained under optimal conditions were determined.

Novel Technology for Bio-diesel Production from Cooking and Waste Cooking Oil by Microwave Irradiation

In the transitional process, acid or base catalysts are common technology to produce bio-diesel from waste cooking oil; however, the catalysts only can be use one time. Highly reaction time is requirement for the transitional technology. For improvement these concern issues, this study applied a novel technology to create bio-diesel product from cooking oil and waste cooking oil by microwave irritation. The microwave irradiation can provide strong power and reach reaction temperature in a short time. The SrO catalyst is a heterogeneous catalyst which is not dissolution into any liquid solution therefore, it can be recycling and reusing again. In this research, the optimum conditions were using commercial SrO, 40 to 180 seconds reaction time, around 80oC reaction temperature, 6 methanol to oil ratio, and 1000W microwave power output. 99% and 93% biodiesel conversion efficiency for cooking oil and waste cooking oil were reached within in these conditions. The determined specifications of obtained biodiesel according to ASTM D6751 and EN14214 standards were in accordance with the required limits. As a conclusion, the present study indicates that derived fuel promises being an alternative for diesel, and could be used in engines without a major modification due to its qualifications.

Preparation of Biodiesel from Jatropha Hybrid Seed Oil through Two-step Transesterification

Seed oil of 15 jatropha hybrids along with their parents were converted into biodiesel through a two-step process: acid-catalyzed (H2SO4) esterification process followed by base-catalyzed (KOH) transesterification. A pre-esterification operation was applied to reduce free fatty acid content and increase the yield of biodiesel. The transesterification of seed oil yielded only 21 to 26% fatty acid methyl ester before acid pretreatment. Gas chromatography analysis after transesterification showed conversion to fatty acid methyl ester was achieved ≥90% for most of the oil samples. The biodiesel yield varied from 4.45 to 4.85 g/5 g oil among the hybrids. Oil to biodiesel conversion efficiency was observed to be ≥90% for most of the oil samples. After conversion biodiesel from all hybrids were characterized for their density, specific gravity, acid value, and iodine value. All of the biodiesels in this study have compatible properties with the international standards of EN 14214, DIN 51606, and ASTM D 6751-02 specifications.

Uncertainty analysis and global sensitivity analysis of techno-economic assessments for biodiesel production

There are various uncertain parameters in the techno-economic assessments (TEAs) of biodiesel production, including capital cost, interest rate, feedstock price, maintenance rate, biodiesel conversion efficiency, glycerol price and operating cost. However, fewer studies focus on the influence of these parameters on TEAs. This paper investigated the effects of these parameters on the life cycle cost (LCC) and the unit cost (UC) in the TEAs of biodiesel production. The results show that LCC and UC exhibit variations when involving uncertain parameters. Based on the uncertainty analysis, three global sensitivity analysis (GSA) methods are utilized to quantify the contribution of an individual uncertain parameter to LCC and UC. The GSA results reveal that the feedstock price and the interest rate produce considerable effects on the TEAs. These results can provide a useful guide for entrepreneurs when they plan plants.

Highly-efficient enzymatic conversion of crude algal oils into biodiesel

Energy-intensive chemical conversion of crude algal oils into biodiesel is a major barrier for cost-effective algal biofuel production. To overcome this problem, we developed an enzyme-based platform for conversion of crude algal oils into fatty acid methyl esters. Crude algal oils were extracted from the oleaginous microalga Nannochloropsis oceanica IMET1 and converted by an immobilized lipase from Candida antarctica. The effects of different acyl acceptors, t-butanol as a co-solvent, oil to t-butanol ratio, oil to methanol ratio, temperature and reaction time on biodiesel conversion efficiency were studied. The conversion efficiency reached 99.1% when the conversion conditions were optimized, i.e., an oil to t-butanol weight ratio of 1:1, an oil to methanol molar ratio of 1:12, and a reaction time of 4h at 25°C. The enzymatic conversion process developed in this study may hold a promise for low energy consumption, low wastewater-discharge biochemical conversion of algal feedstocks into biofuels.

Biodiesel produced by waste cooking oil: Review of recycling modes in China, the US and Japan

Abstract Waste cooking oil to biodiesel conversion efficiency depends on the recycling mode that is being practiced. The recycling modes in China, the US and Japan can be placed in two categories: third party take-back (TPT) and the biodiesel enterprise take-back (BET). We review the operation mechanisms of theses modes, their advantages and disadvantages in three countries and compare them using recycling costs and profits of biodiesel enterprises, subsidies for manufacturers, recycling rates, degree of administrative control, technical support and incentive mechanisms provided for the restaurants. We find that the TPT mode practiced in Japan and the US is superior to the BET mode due to the subsidies provided for biodiesel enterprises and the implementation of strict regulation policies in place for the restaurants. In China, Suzhou and Ningbo cases may have better resource recovery effect than the TPT mode practiced elsewhere, if further enhanced. Finally, we provide suggestions for improving waste oil to biodiesel conversion in China.

Process Intensification Using CO2 As Cosolvent under Supercritical Conditions Applied to the Design of Biodiesel Production

In this work, a new process for biodiesel production under supercritical conditions in presence of cosolvent (CO2) is designed and simulated using the process simulator Aspen Plus. The model was developed using experimental reaction data of continuous catalytic biodiesel synthesis at a 74:25:1 CO2 to methanol to triglycerides molar ratio, temperature range between 150 and 300 °C, at 250 bar. To decrease the temperature and pressure of operation and increase the conversion efficiency of biodiesel, CO2 was added as cosolvent to the reactants. Triolein (C57H104O6) was chosen to represent the vegetal oil and methyl oleate (C19H36O2), biodiesel. A detailed kinetic model based on a three step reversible reaction scheme is used to describe the transesterification reaction in the process simulator. The simulated process resulted in full triolein conversion and a high purity (99.8%) fatty acid methyl esters product. The process plant was designed and simulated to operate in a continuous mode and the annual product...

Components Analysis of Monomer Acid and Application in Biodiesel

The chemical components of fatty acid in monomer acid were determined by GC/MS. After the sample was etherified via methanol, the chemical ingredients and their relative contents of fatty acid in it were analyzed by GC/MS. Fifteen components (such as Myristic acid, Palmitic acid, Oleic acid and Stearic acid ) were identified. The analyzed results showed that the Tetradecanoic acid content reached up to 12.16%, the Hexadecanoic acid accounted for 8.51%, the Octadecenoic acid arrived at 25.53% and the Octadecanoic acid 32.72%. The production technology of biodiesel from monomer acid, using p-toluenesulfonic acid as catalyst, was introduced. Through orthogonal analysis of parameters in a four-factor and three-level test, the optimum conditions obtained for the esterification were molar ratio of methanol to acid 3:1, usage amount of p-toluenesulfonic acid 6% and reaction time 3h, reaction temperature 60°C.Under the optimum conditions, conversion efficiency of biodiesel with monomer acid arrived at 98%.