Ratio Of Waste Cooking Oil Research Articles

Investigation of Rutting and Low Temperature Cracking Behavior of Reactive Ethylene Terpolymer and Waste Cooking Oil Modified Bitumen

With sustainability being the most crucial issue of recent years, the use of waste materials in bitumen modification is increasing and becoming widespread. In this experimental study, it was aimed to investigate the high- and low-temperature behavior of bitumen samples modified with waste cooking oil (WCO), reactive ethylene terpolymer (RET), and polyphosphoric acid (PPA). Accordingly, the multiple stress creep and recovery (MSCR) test and the bending beam rheometer (BBR) test were conducted. Depending on the increasing WCO ratio, the Jnr,R%,∆T_c,and λ parameters of modified bitumens were examined in detail. It was observed that with increasing WCO ratio,the Jnr value increased, and elastic recovery and stiffness decreased. In addition, it has been determined that this composite-modified bitumen is resistant to heavy traffic loads and has sufficient flexibility at low temperatures.

Synthesis of diesel‐like fuels using waste cooking oil and waste polyethylene via Co‐pyrolysis process

AbstractThis study investigated the effects of different proportions of waste polyethylene (WP) and waste cooking oil (WCO) on the chemical and physical properties of the resulting co‐pyrolysis oil produced in an indigenously developed laboratory‐scale fixed bed batch‐type reactor. The proportion of WCO was altered in increments of 10% from 10% to 90%, and correspondingly, the proportion of WP was adjusted from 90% to 10% (by weight). The highest liquid fuel yield, reaching 70.9% by weight, was achieved using a 40:60 ratio of WCO to WP (W40P60) at a constant heating rate of 12°C and a temperature of 500°C. The obtained fuel exhibits promising properties, including a high calorific value (max HHV around 45.63 MJ/kg) and other advantageous properties such as low viscosity, low oxygen and nitrogen content, and absence of sulfur. Fourier‐transform infrared spectroscopy (FTIR) and gas chromatography–mass spectroscopy (GCMS) were examined on the resulting liquid fuel. The GC–MS spectra predominantly display alkanes, constituting approximately 41% by weight, and alkenes, making up roughly 20% by weight. These analyses revealed properties akin to commercial diesel, emphasizing the potential of waste cooking oil and waste polyethylene proportions in liquid diesel like fuel production.

Magnetic carbon nanotubes doped cadmium oxide as heterogeneous catalyst for biodiesel from waste cooking oil

The exploration for innovative heterogeneous catalyst materials bearing unique chemical and physical properties has become a focal point in the field of biodiesel synthesis. In this study, a novel heterogeneous nanocatalyst composed of carbon nanotubes (CNT) coated with magnetic iron oxide and doped with cadmium oxide (CdO) nanoparticles denoted as MCNT@CdO was synthesized. This nanocatalyst was used in the production of biodiesel derived from Waste Cooking Oil (WCO). Several analytical techniques such as field-emission scanning electron microscopy (FESEM) for morphological assessment, Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD) for structural determination, Energy Dispersive X-ray Spectrometer (EDX) for chemical composition analysis, and vibrating sample magnetometer (VSM) for the evaluation of magnetic properties, were tested. Also, the effects of various parameters such as molar ratios of methanol to oil (1:1, 5:1, 10:1, 20:1, and 30:1), catalyst dosages ranging from 0.01 to 0.2 g, reaction times from 60 to 240 min, and reaction temperatures between 25 °C and 120 °C were studied. Based on the findings, the optimal reaction conditions were at the magnetic Carbon Nanotube (MCNT) to Cadmium Oxide Nanoparticles (CdO NPs) ratio of 1:0.5, a molar ratio of WCO to Methanol of 1:10, a reaction duration of 180 min, and a reaction temperature of 120 °C. Moreover, under the most favorable reaction conditions, the catalyst demonstrated satisfactory catalytic efficiency (> 92%) in transforming the triglycerides of WCO into fatty acid methyl esters (FAMEs) for biodiesel production. Therefore, these innovative heterogeneous composites are proposed as alternative catalysts for future biodiesel generation methodologies.

Homogenizer-intensified amidation of free fatty acids in waste cooking oil for biodiesel production

Biodiesel production from waste cooking oil is a viable alternative both to satisfy renewable energy demand and utilize a low-cost feedstock. However, a preparatory procedure is required to reduce free fatty acid contained in waste cooking oil to a specific value which is time- and energy-extensive. Herein, a fast and non-catalytic amidation reaction performs at room temperature is established as an alternative method to reduce the free fatty acid level. The effect of the molar ratio of waste cooking oil to monoethanolamine, reaction time and rotational speed of homogenizer were investigated on the conversion of free fatty acid to alkanolamide compounds. The highest conversion of 95.9 ± 0.02% was achieved in presence of a molar ratio of 1:1.5, reaction time of 0.5 min and rotational speed of 5000 rpm. Further, a homogenizer was used to facilitate the transesterification reaction using an alkaline catalyst at room temperature. The conversion of waste cooking oil to biodiesel of 91.4 ± 0.2% was achieved after 5 min of reaction time. In terms of processing parameters, the non-catalytic amidation and alkaline base catalytic transesterification reaction assisted by a homogenizer device is a time-saved process as it could save 92% and 94% of reaction time compared to one- and two-steps method and was performed in ambient condition.

Evaluation of Physicochemical Properties Composite Biodiesel from Waste Cooking Oil and Schleichera oleosa Oil

Waste cooking oil (WCO) biodiesel has some disadvantages, such as poor cold flow properties, low oxidation stability, and flash point during storage. These poor physicochemical properties can be improved by different ways, such as the addition of non-edible oil. The aim of this study to analyse physicochemical properties of the biodiesel made by between WCO and Schleichera oleosa (SO). The biodiesel produced with 70:30% of WCO and SO respectively as crude oil, further introducing of different KOH-based catalyst into this oil to obtained the methyl ester. The optimum yield transesterification process are 94% with 60 min. of the reaction time, 1 wt.% KOH, and 12:1 molar ratio the methanol to oil. On the other hand, the Schleichera oleosa blend shows oxidation stability at 6.8 h and 3.3 h for Waste cooking oil methyl ester (WCME). The reduction of cold flow and, on the contrary, the flash point increase were obtained with a 70:30% ratio of WCO and SO. The cold flow properties and flash point of the fuel. Thus, mixed WCO and Schleichera oleosa oil improve the physiochemical properties such as oxidation stability, flash point, and cold flow of biodiesel without the need for synthetic antioxidants.

Conversion of Waste Cooking Oil into Bio-Fuel via Pyrolysis Using Activated Carbon as a Catalyst.

The utilization of activated carbon (AC) as a catalyst for a lab-scale pyrolysis process to convert waste cooking oil (WCO) into more valuable hydrocarbon fuels is described. The pyrolysis process was performed with WCO and AC in an oxygen-free batch reactor at room pressure. The effects of process temperature and activated carbon dosage (the AC to WCO ratio) on the yield and composition are discussed systematically. The direct pyrolysis experimental results showed that WCO pyrolyzed at 425 °C yielded 81.7 wt.% bio-oil. When AC was used as a catalyst, a temperature of 400 °C and 1:40 AC:WCO ratio were the optimum conditions for the maximum hydrocarbon bio-oil yield of 83.5 and diesel-like fuel of 45 wt.%, investigated by boiling point distribution. Compared to bio-diesel and diesel properties, bio-oil has a high calorific value (40.20 kJ/g) and a density of 899 kg/m3, which are within the bio-diesel standard range, thus demonstrating its potential use as a liquid bio-fuel after certain upgradation processes. The study revealed that the optimum AC dosage promoted the thermal cracking of WCO at a reduced process temperature with a higher yield and improved quality compared to noncatalytic bio-oil.

Catalytic co-pyrolysis of ironbark and waste cooking oil using strontium oxide-modified Y-zeolite for high-quality bio-oil production

Catalytic co-pyrolysis of ironbark (IB) and waste cooking oil (WCO) over strontium oxide (SrO) loaded hierarchical Y-zeolite was performed using a fixed bed reactor. The effect of reaction temperature, IB:WCO ratio and SrO loading percentage on product distribution and quality was examined. The findings indicated that the highest bio-oil yield (55.3 %) was obtained at a pyrolysis temperature of 550 °C. A further increase in the reaction temperature (650 °C) initiated secondary cracking reactions, which reduced bio-oil yield. Simultaneously, the maximum aromatic yield (28.6 %) was obtained at an IB:WCO ratio of 1:1 and 10 wt% SrO loading. Increasing the amount of WCO enhanced the aromatic yield by providing alkyl radicals and a hydrocarbon pool to promote the conversion of methoxy/hydroxyl, phenols, and levoglucosan into poly-aromatics. Basic sites introduced by SrO addition promoted the ketonization of fatty acids to aliphatic ketones. The reaction mechanism of catalytic co-pyrolysis of IB and WCO showed that the acid sites on Y-zeolite and basic sites on SrO contribute to the conversion of oxygenated compounds to phenols and aromatic hydrocarbons. The present work indicates that SrO/Y-zeolite active sites increased the aromatic carbon yield.

Effects of Injector Nozzle Number of Holes and Fuel Injection Pressures on the Diesel Engine Characteristics Operated with Waste Cooking Oil Biodiesel Blends

This work covers the impact of varying injector nozzle hole numbers (INHNs) and fuel injection pressures (IPs) on fuel atomization, performance, and exhaust emission characteristics of a diesel engine. The primary goal of this research was to improve fuel characteristics. Increasing INHNs and fuel IPs have a substantial impact on the blended fuel viscosity and density, which leads to increased atomization and mixing rates, as well as combustion and engine efficiency. The fuel atomization was checked by varying the INHNs with an operating diesel fuel using the ANSYS Fluent spray simulation work. The experimental test was performed on the fuel blends of waste cooking oil (WCO)–diesel blends from 10 to 30% (with an increment of 10%) by evaluating the performance and emission parameters. The fuel IPs were altered on four, such as 190, 200 (default), 210, and 220 bar with a modification of INHN of 1 (default), 3, and 4), each 0.84, 0.33, and 0.25 mm in orifice size, respectively. The simulation result shows that the INHN-4 has better fuel atomization. Whereas the experimental test revealed that the increment in blending ratio of WCO was up to 30%, INHNs and fuel IPs enhanced the BSFC and BTE and reduced exhaust emissions. The results indicate that increasing the fuel IP up to 210 bar with a 4-hole INHN for B30 was the optimal combination for the overall enhancement of BSFC and BTE, as well as lower CO and HC emissions with a minor rise in NOx when compared to the baseline diesel.

ANALYSIS OF THE PHYSICAL CHARACTERISTICS OF BIODIESEL PRODUCTS MADE FROM USED COOKING OIL

Biodiesel is a very potential material used as a substitute for diesel fuel derived from petroleum. In manufacture of biodiesel was used waste cooking oil with FFA levels obtained which is 3.1%, so that the transesterification process is directly carried out. This study aims to find out the physical characteristics of biodiesel produced from waste cooking oil with a molar ratio of waste cooking oil to methanol 5:1 and 4:1. Method that used in this research is experiment and analytic of physical characteristics of biodiesel products made from used cooking oil. The results of the physical characteristic test of biodiesel with a ratio of 5:1 and 4:1 showed that the biodiesel density of waste cooking oil had met SNI 04-7182-2012. Viscosity test results showed that biodiesel from waste cooking oil has not met SNI 04-7182-2012. The results of flash point tests showed that biodiesel from waste cooking oil has not met SNI 04-7182-2012. Freezing point test results showed that biodiesel from waste cooking oil had met SNI 04-7182-2012. The results of the heat value test showed that biodiesel from waste cooking oil has not met SNI 04-7182-2012. And the yield shows that biodiesel from waste cooking oil has not produced a significant biodiesel yield.

Effect of process variables on the chemical characteristics of crumb rubber desulfurized by waste cooking oil and its desulfurization mechanism

Resource recovery from waste has emerged as one of the grand challenges for civil engineers in the 21st century. Waste cooking oil (WCO) and crumb rubber (CR) are both promising renewable resources and more and more attention has been paid to them. This study explores the effect of the process variables - mass ratio of WCO to binary mixture, reaction temperature and reaction time - on the chemical characteristics of CR desulfurized by WCO. Chemical component, molecular weight distribution and morphology were characterized through thermogravimetric analysis, gel permeation chromatography, scanning electron microscopy. Based on the results, the desulfurization mechanism of crumb rubber was investigated by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Results showed that with the increasing temperature and the dosage of WCO, more rubber hydrocarbon with smaller molecules was generated, while cross-linked structure was destroyed and complex structural changes occurred. An increased dosage of WCO has significant influence on the morphologies of vulcanized rubber, manifesting a decreased roughness and a clearer “groove” structures. Reaction temperature has little effect of that due to enough high desulfurization degree. Before 2 h of the desulfurization, the effect of reaction time is similar to that of dosage of WCO, but the desulfurization degree decreases due to chain growth after 2 h. In order to ensure effective desulfurization and avoid energy consumption, the time of less than 2 h, at least the temperature of 260 °C and 0.4 to 0.5 mass ratio of WCO are recommended.

Diesel Engine Run with Waste Cooking Oil (WCO) and Jatropha Biodiesel Blended Fuel

This project has been study the performance of diesel engine which runs with waste cooking oil (WCO) blends with jatropha biodiesel. The presence of jatropha biodiesel improved the fuel properties of WCO in blended fuel. Jatropha biodiesel was prepared through transesterification process from jatropha crude oil (JCO) by adding 20% amount of methanol and seven gram of potassium hydroxide per liter of JCO. The blended ratio of WCO started from 5%, 10%, 15%, 20%, 25% and 30% which were compared to jatropha biodiesel. The properties of blended WCO and jatropha biodiesel than WCO were improved in terms of kinematic viscosity (reduce between 3 to 13%), density (reduce between 6 to 8%) and calorific value (increase between 3.5 to 3.8%) as increases the volume of jatropha biodiesel in the fuel blends. The blended fuels were tested on YANMA L48N diesel engine at constant speed (1500 rpm) but different engine loads of 2 Nm, 3 Nm, 4 Nm, 5 Nm and 6 Nm. The performance of diesel engine with the blended fuel was compared to the petroleum diesel fuel in terms of brake specific fuel consumption (BSFC), Brake Thermal Efficiency (BTE) and exhaust emissions. The exhaust emission characteristics of blended fuels were significant to environmental benefit as the amount of CO2 emission was found reduced approximately between 11 to 33%. This project found that the optimum blending ratio is at low volume of WCO than jatropha biodiesel in the range of 5 to 10%.

Synthesis and Characterization of Waste Eggshell-Based Montmorillonite Clay Catalyst for Biodiesel Production from Waste Cooking Oil

The depletion of resources and increase in demand for fossil fuel raise concerns as it is natural and non-renewable. Therefore, it will cause limitation on its availability and continuous reduction. This issue has led to the search for more economic, sustainable, and environmentally friendly alternatives which is biodiesel. The major drawback that reduces the possibility of biodiesel commercialization is the high cost of oil feedstock as it covers 75% of its total production cost. The waste cooking oil is used as feedstock in continuous transesterification as it is the primary option to lower the cost of biodiesel production. Biodiesel can be prepared using waste cooking oil and catalyst through transesterification reaction. In this research, the focus is on the utilization of chicken and quail waste eggshell to synthesize highly active Calcium Oxide (CaO)-based heterogenous catalyst with montmorillonite clay to catalyze efficient conversion of waste cooking oil to biodiesel. The formation of CaO/montmorillonite catalyst was confirmed based on the outputs from X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The physio-chemically characteristics of catalysts exhibited a BET surface area from the ranging from 9.2-9.5 m2/g and presence of around 87% of elemental calcium as constituent through XRF characterization. In addition to this, high-performance liquid chromatography (HPLC) analysis is used to determine the conversion of biodiesel using conventional and microwave heating method which revealed a maximum biodiesel production yield of 98%. This optimum biodiesel yield was obtained at reaction temperature, molar ratio of waste cooking oil to methanol, and catalyst amount of 60 ºC, 2 h, 1:12, 2.5 wt.% and 5 wt.% for both eggshells, respectively.

Application of response surface methodology for optimization of biodiesel production parameters from waste cooking oil using a membrane reactor

In light of the growing concerns over depleting energy resources, alternative renewable fuels such as biodiesel have been identified as a possible means of addressing this crisis. In biodiesel production, waste cooking oil (WCO) is seen as the ideal alternative feedstock to vegetable oils, which are part of the food chain. The need to obtain high quality biodiesel at minimal cost has driven the idea to use membrane reactors, which offers the ability to achieve both reaction and separation processes simultaneously. Design and optimization studies were conducted using sulphated zirconia pre-treated WCO as feed stock. Response surface methodology modelling was used to investigate the effect of reaction temperature, catalyst concentration and circulation flow rate in biodiesel production using membrane reactors. This is because limited data is available, particularly considering circulation flow rate effect on biodiesel production using membrane reactors. Experimental results also show that the higher the catalyst to WCO ratio the higher the free fatty acids (FFA) content. A maximum biodiesel yield of 92. 6 mole % was obtained at a temperature of 61°C, circulation flow rate of 26 mL/min using KOH catalyst concentration of 1.3 wt % over a TiO2/Al2O3 membrane. Upon membrane optimization, a biodiesel yield of 94.03 mol % was obtained at 58.5 °C, circulation flow rate of 18.78 ml/min and catalyst concentration of 1.24 wt %. This analysis clearly shows that RSM can be successfully used to model reacting membranes using temperature, catalyst concentration and circulation flow rate to achieve higher yields for biodiesel production.

Use of hydrodynamic cavitation for esterification of free fatty acids in waste cooking oil

Esterification followed by transesterification process is widely applied for biodiesel production from oil with high free fatty acids (FFA) content to remove the FFA and increase the yield of biodiesel. The aim of this research was to study the esterification of waste cooking oil using the hydrodynamic cavitation apparatus. Waste cooking oil with initial FFA content 4.33% was esterified with methanol using sulfuric acid 1%-w/w as the catalyst. The reaction condition was kept constant for 120 minutes of total reaction time. At the best operating condition i.e. molar ratio of waste cooking oil to methanol 1:10 and reaction temperature 50 °C, the initial FFA of waste cooking oil 4.33% reduced to 0.76%. The experimental results also showed that the hydrodynamic cavitation had better performance than the conventional process using mechanical stirring.

Aromatics production from fast co-pyrolysis of lignin and waste cooking oil catalyzed by HZSM-5 zeolite

Lignin and waste cooking oil are wastes from paper and food industries, respectively. In this work, the catalytic fast co-pyrolysis of lignin and waste cooking oil for the production of aromatics in a pyroprobe was investigated with an aim to improve the utilization of lignin waste and waste cooking oil. Furthermore, lignin-derived monomers, including phenol, o-cresol, and guaiacol, were also used as model feedstock for the catalytic co-pyrolysis in order to study the mechanism underlying aromatic formation. The mechanistic study helped lay theoretical foundation for the industrial application of the co-pyrolysis process. The effects of catalyst and waste cooking oil addition on co-pyrolysis product fractional yield and selectivity were studied. High amount of waste cooking oil in the feedstock with appropriate catalyst-to-feedstock ratio (3:1) contributed to high peak-area yields of the total detected compounds and aromatics. The alkylation and demethoxylation of phenols were enhanced at high ratios of catalyst to feedstock and waste cooking oil to lignin. When the ratio of waste cooking oil to lignin was 1:1, the highest mono-aromatic selectivity (82.6%) and synergistic extent (52.1%) for mono-aromatic production were obtained. The catalytic co-pyrolysis of the lignin-derived monomers and waste cooking oil showed that guaiacol was the most active compound to be converted to aromatics, followed by o-cresol, and phenol. The reaction mechanism underlying the formation of aromatics from the synergistic conversion of aliphatics and phenolics was elaborated.

Non-catalytic Transesterification of Waste Cooking Oil with High Free Fatty Acids Content Using Subcritical Methanol: Process Optimization and Evaluation

Palm cooking oil consumption in Indonesia is very high, and as a result, the used cooking oil which mostly ends up as the waste is also high. Direct discharge of waste cooking oil (WCO) into the environment causes serious environmental pollution problems. WCO contains triglyceride and free fatty acid, which can be converted into biodiesel. In this study, the conversion of WCO into biodiesel was conducted using non-catalytic subcritical methanol process. The effect of the ratio of WCO to methanol (w/v), temperature, and pressure on the recovery of biodiesel was investigated under constant reaction time of 4 h. Based on the Response Surface Methodology (RSM); temperature, pressure, and WCO to methanol ratio (w/v) gave a significant effect on the recovery of fatty acid methyl ester (FAME). From the experimental result, the maximum FAME recovery obtained was 93.29% with the purity up to 97% (200 °C, 5.5 MPa, 3:10), while the predicted recovery calculated by RSM was 91.93% with the optimum condition: 200 °C, 5.5 MPa for WCO to methanol ratio 0.3061 (w/v). The experimental verification showed satisfactory agreement between the observed and predicted values with only 1.36% of error. Therefore, subcritical methanol has good prospects to be applied further in lieu of conventional process to utilize waste oil with high free fatty acid content.

Upgradation of waste cooking oil to biodiesel in the presence of green catalyst derived from date seeds

The present work reports a valorization of waste cooking oil (WCO) conversion to biodiesel in the presence of carbon catalyst derived from waste date seeds. The leftover carbon material is treated to remove impurities and modified further by impregnating KOH, and is then used for biodiesel production. The optimization of the complete biodiesel production process was carried out considering the operating parameters reaction temperature (°C), retention time (min), catalyst composition/amount and methanol:WCO ratio. Three types of catalysts were prepared to predict the best composition of green catalysts derived from waste date seeds. Within the limit of set constraints, the maximum biodiesel yield obtained from WCO by a transesterification process was 93%. This high product conversion was achieved at an operating reaction temperature of 65 °C, using synthesized green catalyst type II with 3 wt% KOH on carbon, with a retention time of 90 min and a methanol:WCO ratio of 10:1. The synthesized biodiesel was characterized to evaluate and report its quality in line with international American Society for Testing and Materials (ASTM) and European Norms (EN) standards. The results show that the demonstrated work successfully produced biodiesel with high yield and within set safe standard quality limits.

Transesterification of waste cooking oil: Quality assessment via thermogravimetric analysis

Biodiesel is a good substitute for petrol-diesel at lower greenhouse emissions footprint. Biodiesel is commonly generated through transesterification of lipid, animal fat and waste cooking oil (WCO) with alcohol in the presence of catalyst. Assessment of the product quality of biodiesel and the byproduct for further utilization can be done using Thermogravimetric analysis (TGA) instead of more involved and specialized technique such as GC/MS and HLPC. TGA of biodiesel and the crude byproduct glycerol were investigated in this work following transesterification essay under different reactants ratio and catalysis concentrations. Biodiesel TA thermographs was characterized by four events and with two distinct peaks shown in the derivative of TGA curve. The crude glycerol showed three pronounced peaks. The best conversion of WCO to biodiesel was determined based on the fraction of biodiesel or the 2nd TGA event. Highest conversion was obtained at 12:1 Methanol:WCO molar ratio 93% compared to 65%, 77% and 89% at 3:1, 6:1, 9:1 ratio, respectively. The influence of the catalyst is observed at lower molar ratio by advancing the conversion from 65% to 77% and 79% to 93% at 3:1 and 6:1 Methanol:WCO ratio, respectively. Higher glycerol quality was obtained at lower catalyst concentration.

Modification of bayah banten natural zeolite as heterogeneous catalyst in biodiesel production

The purpose of this study was to produce a biodiesel through the reaction of waste cooking oil with methanol by using a modified Bayah Banten zeolite as catalyst. This catalyst was produced from its natural from by using potassium hydroxide (KOH) as a reactant in 100 ml of distilled water. The reaction to produce a biodiesel was performed at various temperature and time to get the optimum condition. The advantages of this catalyst were eco-friendly, easily separated after the reaction process, and can be reused as a catalyst. The molar ratio of waste cooking oil and methanol for transesterification process was 1:7. The yield of biodiesel at various optimum temperatures and times is 94% (50 gram of KOH/100ml), 87,8% (75 gram of KOH/100ml), and 86% (100 gram of KOH/100 ml). Biodiesel results were analyzed by GC Ester content and modified catalysts were characterized using XRD, FTIR, and SEM-EDX.

Optimum condition of biodiesel production from waste cooking oil using continuous stirred tank reactor

Energy demand in Indonesia is increasing, but the availability of fossil energy is running low. Therefore the effort to get renewable energy is increasingly encouraged. The most widely alternative energy used in Indonesia is biodiesel. Waste cooking oil is very potential to be utilized as raw material of biodiesel. Currently there are 3.75 million liters of waste cooking oil per year. Waste cooking oil when discharged into the body of water will form a layer so that oxygen is blocked into the water. Utilization of waste cooking oil into biodiesel will reduce the burden of environmental pollution by waste cooking oil. This paper proposes optimum conditions of biodiesel production from waste cooking oil using continuous stirred tank reactor with base catalyst. The research variables are reaction temperature, the mole ratio of waste cooking oil and methanol, and the amount of catalyst. This paper also evaluates the heating value of biodiesel produced from waste cooking oil.