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2003 Course Refinery Process Design

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Total No. of Questions : 8] P1567 [Total No. of Pages : 6 [3764]-398 B.E. (Petrochemical Engg.) REFINERY PROCESS DESIGN Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) Distillate from butane-pentane splitter has the following molar composition. i - C4 : 24.5%, n - C4 : 66.5%, i - C5 : 6.59%, n - C5 : 2.42% Assuming total condenser in operation for the distillation column. [16] a) Calculate inlet and exit temperatures for the process stream in the condenser at 600 kPa. Assume saturated reflux. (Use Fig. A). b) Assuming minimum driving force of 10 C between process and utility streams in condenser, calculate the possible temperatures for inlet and exit of cold utility stream. Q2) a) Comment on selection of column pressure in case of industrial distillation practice. [6] b) Comment on choice of partial Vs total condenser in operation of distillation column. [5] c) What is subcooled reflux? What is the effect of subcooling of reflux on column performance? [5] Q3) Answer the following questions with respect to multicomponent distillation. a) Define what you mean by light key and heavy key. [4] b) How are the keys decided? [3] P.T.O.

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