Q.1. Illustrate brief answer of the following questions. [CLO1] (i) Explain briefly the composition of crude oil. [20 MARKS] (ii) What are the various low boiling products of a refinery? (iii) Give the significance of ASTM distillation of petroleum products. (iv) Describe in detail the following types of reflux in the atmospheric distillation column: a) Top tray reflux b) Pump around reflux. (v) Describe the single stage and double stage electrostatic process for the desalting of crude oil. (vi) Explain the need for vacuum distillation of crude oil. How is vacuum obtained? (vii) Explain the importance of the auxiliary equipment in efficient functioning of the refinery distillation unit. (viii) Give the necessity of delayed coking and hence explain the process. (ix) Discuss how the various catalysts affect the reforming process. (x) Why is propane a preferred solvent in the deasphalting of lube oil base stock