Chemical Engineering Answers

(1) Describe the composition of fabrication

(2) Describe the physical properties of fabrication

(3) Describe the mettods of fabrication

Describe the composition , physical properties and mettods of fabrication , and uses of acid resistant brick

A 10min experimental run shows that 75% of liquid reactants is converted to produce by a half other rate 1/2 other rate or half. What will be the amount converted in a half hour (1/2 hr run)mm

By what percentage would the rate of absorption be increased or decreased by increasing the total pressure from 100 to 200 KN/m2 in the following cases:

a. The absorption of ammonia from a mixture of ammonia and air containing 10% of ammonia by volume, using pure water as solvent. Assume that all the resistance to mass transfer lies within the gas phase.

b. The same conditions as (a) but the absorbing solution exerts a partial vapour pressure of ammonia of 5 KN/m2. The diffusivity can be assumed to be inversely proportional to the absolute pressure.

By what percentage would the rate of absorption be increased or decreased by increasing the total pressure from 100 to 200 KN/m2 in the following cases: a. The absorption of ammonia from a mixture of ammonia and air containing 10% of ammonia by volume, using pure water as solvent. Assume that all the resistance to mass transfer lies within the gas phase. b. The same conditions as (a) but the absorbing solution exerts a partial vapour pressure of ammonia of 5 KN/m2. The diffusivity can be assumed to be inversely proportional to the absolute pressure.

Model distillation column with hold up taking necessary valid assumptions?

Model stripping section of an ideal binary distillation column taking valid assumptions

Show that when a Bingham plastic fluid flows under laminar condition through a tube of radius R and length L the volumetric flow rate, Q is given by 4 4 0 0 0 0 ( ) 4 1 1 8 3 3 L R R P P R Q L         −     = − +               Where 0  and R  are the yield stress and shear stress at the tube wall, respectively.

In a gas absorption experiment a viscous fluid flows upward through a small circular tube and then downward in laminar flow on the outside. Set up a momentum balance over a shell of thickness r in the film, as shown in figure 1 (Appendix A). Note that the “momentum in” and “momentum out” arrows are always taken in the positive coordinate direction, even though in this problem the momentum is flowing through the cylindrical surfaces in the negative r direction. i. Show that the velocity distribution in the falling film (neglecting end effects) is 2 2 2 1 2 ln 4 z gR r r v a R R         = − +               ii. Show that the mass rate of flow in the film is given by 2 4 2 4 4 1 4 3 4 ln 8 gR w a a a a   = − + − +     iii. Show that the result in (b) simplifies to the following equation, if the film thickness is very small ( Use a = +  1 , 1   ) 2 3 cos 3 gW w     = , Where W R = 2 and   = R .

A solid sphere of radius R is rotating slowly at a constant angular velocity '  ' in a large body of quiescent fluid as shown in figure 2 (Appendix-I). Develop expressions for the pressure and velocity distributions in the fluid using shell momentum balances (refer figure 3). Also find out the torque required to maintain the motion. Assume that the sphere rotates sufficiently slowly so that one can conveniently use the creeping flow assumption. Appendix-A Figure 1: Velocity distribution and z-momentum Balance for the flow of a falling film on the outside of a circular tube. Figure 2: A slowly rotating sphere in an infinite expanse of fluid Figure 3: Differential Volume Elemen