A comparative review of some physicochemical properties of biodiesels synthesized from different generations of vegetative oils

Abstract

Physicochemical properties of different biodiesel generations synthesized from 11 vegetative oils have been reviewed in purpose of comparing the values of biodiesel physicochemical properties and determination the required feedstock for preferable biodiesel. According to the review, two main factors are affecting the physicochemical properties of yielded biodiesel; the first factor is the raw material of vegetative oil that leads to inherent properties like the energy content, cloud, pour, flash points, kinematic viscosity, cetane and iodine numbers. The other factor is synthesis method and handling procedures of biodiesel production which results in properties such as alcohol and glycerin content, suspended solids, and acid value. This review focuses on 9 important physicochemical properties; Density at 15 °C, kinematic viscosity at 40 °C, cloud, pour, and flash points, heating value, acid value, Cetane number, and iodine number. The standards of ASTM D6751, EN 14214, IS 15607, and MS 2008:2008 are provided to check matching with the physiochemical properties of reviewed biodiesels.