Biodiesels obtained from renewable energy sources are considered to be good alternatives to traditional fuel
sources due to their environmental friendliness. Purification of the biodiesel upper-rich phase composition after
transesterification is often influenced by some parameters. This study investigated the influence of temperature
and time interval on the purification of biodiesel upper-rich phase mixture composition of Jatropha oil biodiesel
system consisting of Jatropha oil biodiesel, methanol, glycerol at (20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C,
55°C, 60°C) and (2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32) minutes respectively. The results were
obtained by cloud point titration method under isothermal conditions at the different temperatures and time intervals
and further analyzed using GC to provide the phase composition in mass fractions of the sample containing the
mixture component. The analysis indicated increased mass composition of Jatropha oil biodiesel from 20°C to 60°C
at intervals of 5°C attaining maximum value of 97.2% at 20°C, 97.4% at 40°C and 97.2% at 55°C for time intervals
of 2 minutes in each case. This implied that temperature and time had minimal influence on the purification of the
components of the Jatropha oil biodiesel upper-rich phase.