Answer / kaushik

for equal ditribution of pressure

Answer / giri

because spheres are having constant surface per unit area.
so distribution of preesures will b equal at all points.

Answer / murthy

there are mainly two considerations before designing
storage vessel of flammable liquids.
(1)the temperature removal should be very fast,there is lot
of heat loss in spherical design,than tubular one,so heat
removal is more.
equilibrilium between vapor and liquid will shifted towards
liquid side when stored in spherical cylinders.
(2) requirement of inert gas for padding is greatly reduced
in case of spherical cylinders as vapor pressure of liquid
is reduced due to reason 1

I am a Diploma Chemical Engineer by Nirma Uni; and BEng (Hons) Energy & Environmental Engineer by Napier Uni; Edinburg, UK. HPCL chemical engineering test will held on 14th July,09. So, Please send me some previous chemical engineering papers Objective types Or material to give the test.

0 Answers   HPCL,

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A distillation column separates 10000 kg / hr of a mixture containing equal mass of benzene and toluene. The product D recovered from the condenser at the top of the column contains 95 % benzene, and the bottom W from the column contains 96 % toluene. The vapor V entering the condenser from the top of the column is 8000 kg / hr. A portion of the product from the condenser is returned to the column as reflux R, and the rest is withdrawn as the final product D. Assume that V, R, and D are identical in composition since V is condensed completely. Find the ratio of the amount refluxed R to the product withdrawn D. Hint : Solve the simultaneous equations as follow in order to find the answer (R / D) : 10000 = D + W; 10000 (0.5) = D (0.95) + W (0.04); 8000 = R + D.

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1 Answers  

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