Temperature of the reaction is also a deciding factor in yield of
biodiesel. Increase in temperature is found to speed up the reaction and more yield is achieved which may be due to reduction of
viscosity of oil on increasing the temperature resulting in better
mixing of oil with alcohol and faster separation of glycerol from
biodiesel. However, further more increase in temperature resulted
significant dip in yield of biodiesel. This could be related to the fact
that at higher temperatures, the side reactions (for example
hydrolysis of methyl esters of fatty acids to corresponding acid and
alcohol) occur more rapidly in contrast to transesterification
reaction, resulting in lower biodiesel yield. Noureddini [51]
investigated on soybean biodiesel produced with methanol and
temperature was varied from 30–70°C while keeping other
parameters were kept constant and rate of reaction was studied. It
was observed that 70°C was favourable temperature among different temperature conditions for best biodiesel yield and reaction
rate.Table 5highlights the effect of temperature on production of
biodiesel on the basis of literature.