Abstract

Efforts to improve the physical and chemical properties of vegetable oils as diesel fuels such as viscosity and calorific value are indispensable with the depletion of fossil oil reserves. Jatropha oil with long chain fatty acids and high degree of unsaturation is mixed with short chain saturated fatty acid coconut oil in various compositions. The mixture was heated and stirred for 30 min at 90 °C. This mixing leads to a decrease in viscosity which allows for the breaking of the bond. The fatty acid molecule structure undergoes transformation that changes the degree of unsaturation and the average length of the carbon chain. Consequently, the kinematic viscosity and flash point of the mixture decreases while its calorific value increases.

Highlights

  • Vegetable oil is an alternative fuel and one of biodiesel’s raw materials

  • Jatropha oil has a fatty acid composition that is dominated by unsaturated fatty acids, while coconut oil is dominated by saturated fatty acids with relatively short chains

  • Jatropha oil is mainly composed of eicosatrienoic acid which causes it to have high density and viscosity

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Summary

Introduction

Vegetable oil is an alternative fuel and one of biodiesel’s raw materials. In this decade, much research has been aimed at obtaining liquid fuels from renewable materials, including vegetable oils.Vegetable oil can be used directly or mixed with diesel oil to operate a diesel engine. Vegetable oil is an alternative fuel and one of biodiesel’s raw materials. In this decade, much research has been aimed at obtaining liquid fuels from renewable materials, including vegetable oils. The use of vegetable oil and diesel oil blends has been tested by several researchers [1,2,3]. Vegetable oil is possible with slight modifications to the fuel system [4]. The weaknesses of vegetable oil as a diesel fuel include high viscosity, a high pour point, high flash point, high cloud point, high density and reactivity of unsaturated hydrocarbon chains [5], high NOx emissions, low oxidation stability, and a lower energy content [6]

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