In this work attempt was taken to develop a method for improving the straight run refining process. It is established that the yield of main products petrol and diesel increases from 28.88% to 32.84% and 40.08% to 46.19% respectively when optimum quantity of additives was used. Maximum quantity of additives depends upon the type of additives thats why optimum quantities of additives used in this process of distillation are different for different additives. By TGA, 1H-NMR and GCMS analysis, it is established that the quality of products (octane number of gasoline which mainly depend upon the...