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Supercritical Synthesis of Ethyl Esters via Transesterification from Waste Cooking Oil Using a Co-Solvent

Journal of Environmental Protection 2015年第9期6卷 986-994页

作者： tapaswy muppaneni Harvind K. Reddy Shuguang Deng Chemical Engineering Department New Mexico State University Las Cruces USA

Biofuels became more promising alternative to the fossil fuels because of the depletion of fossil resources, renewability, environmental benefits, and energy security. Ethanolysis of waste cooking oil with hexane as co-solvent was carried out for the production of fatty acid ethyl ester (FAEE). This process reduced the severity of process parameters with high purity biodiesel yield. Process variables such as co-solvent ratio, ethanol to oil molar ratio, reaction temperature and reaction time were optimized. The maximum biodiesel yield of 88% was obtained at ethanol/oil molar ratio of 40:1, co-solvent (hexane) to oil ratio of 0.2% (v/v), reaction temperature of 300°C in 20 min of reaction time. Fatty acid ethyl ester (biodiesel) samples produced from this process were measured and evaluated using GC-MS analytical instrument. Thermo gravimetric analysis (TGA) was also performed to examine the thermal stability of waste cooking oil, ethyl esters and fuel blends. Fuel properties of ethyl esters were determined and compared with the ASTM standards for biodiesel, regular diesel and ethyl esters from different feedstock.

关键词： Fatty Acid Ethyl Esters Supercritical Ethanolysis Co-Solvent Waste Cooking Oil

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Biodiesel Production from Waste Cooking Oil Using Sulfuric Acid and Microwave Irradiation Processes

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Journal of Environmental Protection 2012年第1期3卷 107-113页

作者： Prafulla D Patil Veera Gnaneswar Gude Harvind K. Reddy tapaswy muppaneni Shuguang Deng Chemical Engineering Department New Mexico State University

A comparative study of biodiesel production from waste cooking oil using sulfuric acid (Two-step) and microwave-assisted transesterification (One-step) was carried out. A two-step transesterification process was used to produce biodiesel (alkyl ester) from high free fatty acid (FFA) waste cooking oil. Microwave-assisted catalytic transesterification using BaO and KOH was evaluated for the efficacy of microwave irradiation in biodiesel production from waste cooking oil. On the basis of energy consumptions for waste cooking oil (WCO) transesterification by both conventional heating and microwave-heating methods evaluated in this study, it was estimated that the microwave-heating method consumes less than 10% of the energy to achieve the same yield as the conventional heating method for given experimental conditions. The thermal stability of waste cooking oil and biodiesel was assessed by thermogravimetric analysis (TGA). The analysis of different oil properties, fuel properties and process parametric evaluative studies of waste cooking oil are presented in detail. The fuel properties of biodiesel produced were compared with American Society for Testing and Materials (ASTM) standards for biodiesel and regular diesel.

关键词： Biodiesel Waste Cooking Oil Free Fatty Acid Sulfuric Acid Microwave-Assisted Transesterification

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Biodiesel Production from Waste Cooking Oil Using Sulfuric Acid and Microwave Irradiation Processes

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Journal of Environmental Protection 2012年第1期

作者： Prafulla D Patil Veera Gnaneswar Gude Harvind K. Reddy tapaswy muppaneni Shuguang Deng

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