Chemical Engineering Interview Questions

Please be specific. water individually can not distill. From which solvent you want water to be distilled?

water has lower boiling point(100deg) than toluene(110). one which has lower boiling point has also higher volatility and hence water can be easily separated using distillation.

Fractionation is used when the boiling point difference is less than 70 degree, but distillation is widely used not need this requirement..both are distillation or we can say processes of separation based on boiling point.

Distillation is the separation of particular compound according to boiling point by using external heat. Fractionation is like a same as earlier, but flash evaporation not happening there. Vapor liquid eqm is difficult.

Fluid having more corrosive nature and higher fouling factor is passed through tube side because we can easily replace the tube after maintenance but if the shell get corroded it will be more economical to replace or maintain it.

More corrosive liquid enters tube
Tubes are meant for higher operating pressure
Tubes are meant for higher pressure drops
More viscous liquids should enter the shell side
Liquid with more fouling factor should enter the tube side.

Fugacity gives the degree of escapability of a molecule. and hence in the distillation column, the phase with high fugacity is favored by the molecule and hence there is a degree of separation in it. ...

Of-course its applicable to fluids . and we count gases in fluids but with care as both liquids & gases show different behavior w.r.t viscosity & some other factors.

yes it can be used, but limited for moderate mach numbers.

Valency is the number of free electrons present in an atom, ready to combine with other electrons in the orbit of an element. To get a more precise definition, please refer any physical chemistry books.

In regard to pressure the mathematical pressure function for the variable viscosity and compressibility of gas is Pseudo-pressure or real gas potential. Its the changes that occur in gas properties with pressure.

One-celled organisms, like viruses, fungi, and bacteria, are Microorganisms and are found everywhere in the world. Some microorganisms are needed for living things to survive and there are more microo...

We chemical engineers can make fertilizers, new water management, pest management etc. if we know to play or work with chemicals we can do many great things.

Based on API gravity we can categorize crude oils into Light crude, Heavy crude or Intermittent crude and accordingly processed. There are also other tests available but this is primary test.

wilson plot /equation is the graphical calculation of convective heat transfer coefficient . hi is proportional to Uexp 0.8.

Absolute entropy of a perfectly crystalline solid at absolute zero temperature is zero.

At absolute zero, the entropy of a system is zero (minimal)

after the process of distillation of crude we get many undesirable product which are hazardous in nature , if we expose without combustion ,it creates pollution due to this we do combustion of all undesirable product inflar .

first of all we should have the concept of the gases remove while treating in refinery operations they can be sox , carbon dioxide , carbon mono and other hazardous gases....... now back to key poin...

FRP (Fibreglass Reinforced Plastics, also known as GRP, or Glass Reinforced Plastics) is a modern composite material of construction for chemical plant equipment like tanks and vessels. Chemical equip...

hydrogen is lighter than air , if placed vertically,cause the more pressure on the top of the valve of a cylinder , horizontally placing reduces the risk .

Cylinders carrying toxic substances, such as sulphur dioxide, must only be transported vertically. Cylinders containing acetylene must always be kept and transported in an upright position.Horizontal...

If we increase the pressure, the no. of stages in a distillation column becomes less as the liquid boils earlier (boiling occurs when the atmospheric pressure becomes equal to the vapour pressure of the liquid.)

The higher the pressure the lower the cooling rate

Molecular weight of iron carbide(Fe3C) is 179.5

Atomic weight of carbon is 12

Percent carbon = (12/179.5)*100 = 6.67%

The iron-iron carbide diagram is only upto 6.67%, because beyond that percentage structure remains the same so we do not study further.

see what is the basic difference between unit operations and unit processes. The term unit operations has been restricted to those operations in which the changes are primarily physical. unit processe...

A unit operation is any part of potentially multiple-step process which can be considered to have a single function with clearly defined boundary.

I do have a question here, If the material of lower insulation be bounded to the first system, doesn't that result in heat loss?

           q/a is directly proportional to k            to make less q/a less value of k r...