Abstract
Compositional analysis of Gas to Liquid (GTL) diesel oil and Biomass to Liquid (BTL) diesel oil were carried out in molecular level by using GC-FID and GC-MS. GTL diesel oil consisted of only paraffinic compounds. BTL diesel oil consisted of 75 wt% of saturate fraction, 22 wt% of olefinic fraction and 2.5 wt% of aromatic fraction.