Process Calculations GATE-2006

Q 1: Pure A at 200 ⁰C is fed to a steady-state adiabatic continuous reactor at the rate of 100 kg/hr where it undergoes an exothermic reaction to give its isomer B. The product stream is at a temperature of 500 ⁰C. The heat of the reaction is 21 of A and the specific heat of the reaction mixture is constant at 35 J/(mol.⁰C). The conversion in the reactor is

A) 25 %
B) 50 %
C) 75 %
D) 100 %

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Statement for Linked Answer Questions 2 & 3:

Solvent C is used to extract solute B selectively from 100 kg/hr feed mixture A + B in a steady state continuous process shown below. The solubility of C in the raffinate and the solubility of A in the extract are negligible. The extract is distilled to recover B in the bottom product. The overhead product is recycled to the extractor. The loss of solvent in the bottom is compensated by make-up solvent S_d. The total flow rate of the solvent stream S going to the extractor is 50 kg/hr. The mass fractions (X_i’s) of some selected streams are indicated in the figure below.

Q 2: Distillation bottoms flow rate W and solvent dosing rate S_d in kg/hr are

A) W = 50, S_d = 50
B) W = 100, S_d = 20
C) W = 10, S_d = 50
D) W = 50, S_d = 10

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Q 3: Feed rate E to the distillation column and overhead product rate T in kg/hr are

A) E = 90, T = 40
B) E = 80, T = 40
C) E = 90, T = 50
D) E = 45, T = 20

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