Venu Babu Borugadda

Comparative studies of thermal, oxidative and low temperature properties of waste cooking oil and castor oil

This study compares the thermo-oxidative stability and cold flow properties of waste cooking oil (WCO) and castor oil (CO) as inexhaustible potential raw materials to replace the conventional diesel fuels. The thermo-oxidative stability and high viscosity are the limitations of the vegetable oils to use directly as fuel in diesel engines. Therefore, proper investigation on these physical properties of WCO and CO could help to develop high energy efficient biofuels which could act as an alternative to fossil fuels. This study proposes modern and advanced analytical techniques, i.e., thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) which consumes less time, energy, and requires less quantity of sample to evaluate aforementioned physical properties. For comparison purpose, properties were also found out using conventional ASTM standard methods. Obtained results by TGA and DSC were very much close to the conventional standard methods. WCO used in this study was found to be thermally ...

Effect of storage parameters on stability of Jatropha-derived biodiesel

Jatropha curcas L. seeds as a raw material for biodiesel production is a rapidly growing interest over the world because of its high oil content, ecological adaptability, and excellent fuel properties. Though there is an increase in productivity of biodiesel, showing solution for future energy insecurity, there still remains some concern for commercialization due to its susceptibility to degradation during long storage. The aim of this paper is to investigate the effect of temperature and ambient condition on Jatropha biodiesel storage. An experiment was conducted for a period of 12 months, where Jatropha biodiesel stored in three groups at different temperatures (4°C, 25°C, and 35°C) and environmental conditions (exposed in dark, light, and air). At regular intervals, the samples were taken out to analyze acid value, density, kinematic viscosity, and thermogravimetric profile to monitor the quality of biodiesel. Analysis showed that acid value, density, kinematic viscosity, and the onset temperature of volatilization and distillation increases with the increase in storage time of biodiesel samples. However, Jatropha biodiesel stored at 35°C, in contact with ambient air and light showed highest degradation compared to those which were stored at 25°C and 4°C. Among all the parameters studied, high temperature and air exposure are the two most potent parameters which accelerate the degradation process. Along with that, light exposure had mild but significant effect on Jatropha biodiesel degradation over a long storage period.