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2003 Course Chemical Process Synthesis

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 323 P 1089 B.E. (Chemical Engg.) CHEMICAL PROCESS SYNTHESIS (2003 Course) (409344) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate answer books. 2) Assume suitable data, if necessary. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. SECTION - I Q1) a) b) Synthesize a detailed process for acetone production from isopropanol with hydrogen as a byproduct, considering : i) Formulation of design problem, ii) Hierarchy and iii) Approaches to chemical process design. [12] Explain grassroot design. [4] OR Q2) a) b) Discuss in detail the onion model of process design. Explain the role of catalyst in the choice of reactor. Q3) a) Benzene is produced from toluene according to the reaction C6H5CH3 + H2 C6H6 + CH4. Some of the benzene formed undergoes a secondary reaction in series to an unwanted byproduct diphenyl, according to the reaction 2C6H6 C12H10 + H2. The following table gives the composition of the reactor feed and effluent streams. Calculate the conversion, selectivity and reactor yield with respect to i) Toluene feed and ii) Hydrogen feed. [12] Component Inlet flow rate (kmol/h) Outlet flow rate (kmol/h) 1858 1583 H2 804 1083 CH4 13 282 C6H5 C6H5CH3 372 93 0 4 C12H10 Explain reaction system for multiple reactions in series producing byproduct. [4] b) [8] [8] P.T.O. OR Q4) a) b) Q5) a) b) Explain idealized reactor model for ideal batch reactor, mixed and plug flow reactor. [10] Derive the correlation to explain the effect of temperature on selectivity and reactor volume. [6] Explain the behaviour of mixtures during azeotropic distillation. [10] Explain the concept of degrees of freedom in the design of evaporator. [8] OR Q6) a) b) Discuss principle, working and construction of fluidized bed catalytic reactor. [10] Explain the effect of various parameters on the performance of absorption. [8] SECTION - II Q7) a) b) Explain heat integration in sequencing of simple distillation column.[8] Discuss thermal coupling for direct and indirect distillation sequencing. [8] OR Q8) a) b) Explain the optimization of reducible structure. [8] Discuss the possible alternative sequences for the separation of five component mixture by distillation sequencing. [8] Q9) a) Explain composite curves for following heat recovery system. [10] Heat capacity Stream Type Supply Target H temperature temperature MW Cp o o Ts, C TT, C MW.k 1 b) R1 Cold 20 R2 Hot 250 R3 Cold 140 R4 Hot 200 Explain criteria of utility selection. OR [3864] - 323 -2- 180 40 230 80 32 -31.5 27 -30 0.2 0.15 0.3 0.25 [6] Q10)a) Explain composite curve for two streams heat recovery system. Stream b) Q11)a) b) Type Supply temperature Ts o C Target temperature TT o C 1 Cold 30 2 Hot 150 Explain graphically heat recovery pinch. 100 30 [8] H MW 14 -12 [8] Explain the intensification of hazardous materials. [8] Compare the fire and explosion hazards in the process involving benzene inventory of 1000 kmol at 120 and 160oC, based on theoretical combustion energy resulting from catastrophic failure of the equipment. The normal boiling point of benzene is 80oC, the latent heat of vaporization is 31,000 kJ/kmol, the specific heat capacity of 150 kJ/(kmol.oC) and the latent heat of combustion is 3.2 x 106 kJ/kmol. [10] OR Q12)Write short note on a) Integration of refrigeration cycle. b) Explosion. c) Attenuation of hazardous materials. [3864] - 323 -3- [18]

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