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2003 Course Process Equipment Design - II

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Total No. of Questions : 12] [Total No. of Pages : 4 [3664] - 275 P 1374 B.E. (Chemical) PROCESS EQUIPMENT DESIGN - II (Revised 2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section I and 03 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. Q1) a) b) SECTION - I Toluene is continuously nitrated to mononitrotoluene in a cast iron vessel, 1 m diameter, fitted with propeller agitator 0.3 m diameter rotating at 2.5 Hz. The temp. is maintained at 310 K by circulating 0.5 kg/s cooling water through a stainless steel coil 25 mm O.D. and 22 mm I.D. wound in the form of helix, 0.8 m in diameter. The conditions are such that the reacting material may be considered to have same physical properties as 75% H2SO4. If mean water temperature is 290 K, what is the overall heat transfer coefficient for the desired heat transfer? Data : properties : Thermal conductivity = 0.59 W/mK, Cp = 4180 J/kg K Viscosity = 1.08 mN.s/m2, density = 998 kg/m3. Properties at 75% H 2SO 4 : T hermal conductivity = 0.4 W/mK. Cp = 1.88 x 103 J/kgK, viscosity = 6.5 mN.s/m2, Density = 1666 kg/m3, viscosity at the surface = 8.6 x 10-3 at 300 K, Thermal conductivity of stainless steel is 15.9 W/mK Dirt resistance at inside and outside surfaces are 0.0002 and 0.0004 m2K/W respectively. [12] Give classification and selection criteria of agitators. [6] OR Q2) a) b) Explain jackets and coils for reaction vessels in detail with neat sketches.[8] Calculate the diameter of shaft for the agitator system. The power required for agitation is 3 hP and speed of rotation is 56 rpm. Impeller diameter is 65 cm. Maximum torque is 18900 kg.m. While bending moment is 27700 kg.m. Permissible shear stress = 400 kg/cm2. Permissible tensile stress = 600 kg/cm2. [10] P.T.O.

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