Chemical Engineering Answers

A shell-and-tube heat exchanger has one pass on the shell side and two passes

on the tube side (i.e.al-2shell and tube heat exchanger). It is being used for oil

cooling. The oil flows in the tube side. It enters at 1120C and leaves at 78 0C

The shell-and-tube fluid is water at a flow rate of1.35 kg/s, entering at 360C and

leaving at 78 0C. The heat capacity of water is 4180j/(kg. K), and the overall

heat transfer coefficient for the heat exchanger is 350 W/(m2.K). The geometry

factor, F is 1.15. Determine the heat transfer area required for the unit.

A mixture of ethyl alcohol and water containing 25 mole % of the alcohol is

fractionated in a continuous rectification column under all atmospheric pressure.

The required concentration of the overhead product is 80 mole %, and the

permissible alcohol content in the bottom product is not over 0.1 mole %. The

still of the column is supplied with direct steam. Calculate the operating reflux

ratio and the relative molar rates of flow of feed, the direct steam supplied and

the bottom product per kmol of overhead product.

The value of ultimate period of oscillation Pu is 3minutesand the ultimate control gain Kcu is 2,select correct set of parameters for PID controller using Zeigler-nicholas

The unit impulse response of a first-order system is given by 2e^0.5t.the gain and time constant of the process respectively are

Characteristics equation of a closed loop system using a proportional controller with a gain kc is 12s3+19s2+8s+1+kc=0. At the onset of instability the value of kc is?

Determine the equivalent circulating density in ppg for laminar flow of drilling fluid with the following data.. mud weight=9.5ppg, tita 300 =40, tita600=60; plastic viscosity=20cPs; circulation rate=650gpm; hole diameter=8.5 in; drill collect OD=6.75in drill pipe OD=5.0 in; drill collar length=600ft; drill pipe length=10,000ft; true vertical deepth= 9000ft

Calculate the pressure gradient in psi/ft from mud weight of 10.0ppg b. Calculate the pressure gradient in psi/ft from mud weight of 80Ib/ft^3.

Determine the volume of cement slurry required to set in the annulus of 20inch conductor pipe, and 107/8- inch casing. Total length of 20inch conductor pipe is 80feet for 107/8 inch section

A well flowing 40%water(viscosity=0.5cP, and FVF=1) and 60% oil(viscosity=4cP and FVF=1.5 from 30-ft thick reservoir. Core analysis indicate the permeability to be 305md. Estimate the productivity index of this well. Assume relative permeability to 0.25 for oil 0.15 for water.

You are expected to evaluate the process to determine the operating conditions that will produce a maximum profit under the set constraints discussed in Section 1. You are to determine the operating temperature, pressure, and steam to ethyl-benzene ratio. There are many cases to be evaluated. You should report the profit (or loss) for each case examined and provide stream tables for the best operating conditions found.