TOPS 1. Crude oil is a complex mixture of hydrocarbons, whose composition is strongly dependent on its origin. BOILING POINT.C FRACTION a. Describe approximately the H/C ratios of the fractions in crude oil as displayed in the inserted figure in a graph relating to the boiling point. NAPHTIU b. Why does the figure show a gap after lube base oils? c. Draw a tendency of the sulfur and nitrogen content as a function of the boiling point d. Explain in a graph how a simple refinery converts the fractions and give approximate products (at least three) LUBE BASE OILS MIDOLE DISTILLATES 370 370 VACUUM GAS OIL 540 RESIDUE