Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemical Engineering Expert

problem 1: A solvent is to be recovered from a solvent air mixture by scrubbing with water in the packed tower at a pressure of 101.3 kN/m2 and at temperature of 300K. The solvent vapour enters the tower at a rate of 0.1kg/s and consists of a concentration of 2% by volume. It is essential to recover 99.9% of the solvent; for the packing chosen the optimum gas and water flow rates are known to be 1.3 and 2.0 kg/m2s correspondingly. Compute the height and diameter of the tower. The data needed is as shown below:

Overall mass transfer coefficient Kya = 0.0389 kg/s m2(kN/m2)
Equilibrium data: Pe = 0.02 x; where Pe equilibrium pressure of the solvent kN/m2 and x the mole fraction of the solvent in water.

Molecular weight of the solvent and air are 70 and 29 kg/kmol, correspondingly. Find out other data in the book and make suppositions which make sense as it applies to respective problem.

problem 2: A sphere of naphthalene ball containing a radius of 10 mm is suspended in a big volume of still air at 318 K and 1 atm absolute pressure. The vapor pressure of naphthalene is 0.56 mm Hg at 318 K and the DAB of naphthalene in air at 318 K is 6.92×10-6 m2/s. Compute the rate of evaporation of naphthalene from the surface in k.moles/m2.s. Estimate the time needed for the diameter to reduce to 2 mm.

problem 3:

a) Under what conditions are the mass average velocity and molar average velocity of the components of a mixture equivalent?

b) Ammonia is defusing via an inert air film thick at a temperature of 200C and a pressure of 1 atm. The concentration of NH3 is 10 percent by volume on one side of the film and zero on the other side. Estimate the result on the rate of diffusion of raising the total pressure to 10 atm.

problem 4: Larson by using an Arnold cell measured the diffusivity of chloroform in air at 250C and 760 mmHg. The liquid density of chloroform at 250C is 1485 kg/m3 and its vapor pressure at 250C is 200mmHg. At time t = 0, the liquid chloroform surface was 74 cm from top of tube and after 10 hrs the liquid surface had dropped by 0.44cm. If the concentration of chloroform is zero at the top of the tube, what would be the gas diffusion coefficient of chloroform in air?

problem 5: Ammonia gas stream from a reactor comprises of 25% by volume of ammonia and 75% by volume of air. Pure water is utilized to absorb ammonia in an absorption packed tower at 300C and 1 atm. The total gas flow rate is 1000 k moles/hr. This is desired to decrease the concentration of ammonia to 2 % by volume in the outlet. Find out the minimum liquid rate? If 2.0 times the minimum liquid is employed, then what will be the number of transfer unit needed? Equilibrium relation is given as y*= 2.0 x, where y is mole fraction of ammonia in gas and x is mole fraction of ammonia in liquid. Compute the diameter of the tower.

Find out other data in the book and make suppositions that make sense as it applies to particular problem.

Chemical Engineering, Engineering

  • Category:- Chemical Engineering
  • Reference No.:- M96802

Have any Question? 


Related Questions in Chemical Engineering

Railroad tracks made of 1025 steel are to be laid during

Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10°C (50°F). If a joint space of 4.6 mm (0.180 in.) is allowed between the standard 11.9-m (39-ft) long rails, what ...

Give graphs that illustrate the sequence of operations in

Give graphs that illustrate the sequence of operations in gas chromatography; normal sequence, chromatogram without heartcutting. with hearcutting.

1explain the possible advantages of a p-i-n photodiode

1. Explain the possible advantages of a p-i-n photodiode over an abrupt pn desi gn. 2. Describe the quantum selection rule as it pertains to n-type QWIP devices. How do conventional QWIP devices overcome this limitation? ...

In a space mission to mars it is needed to equ ip the

In a space mission to Mars, it is needed to equ ip the research robot with a singl e mode l aser to make sample absorbance/transmittance analysis to identify the unkno\vn gases. Assume that all types of lascrs (e.g. gas, ...

Critically analyze the pros and cons of putting a price

Critically analyze the pros and cons of putting a price ceiling on prescription medicine. Make sure to use concepts from both chapters seen this unit such as government intervention, inefficiencies, price elasticity, etc ...

Provide a detailed explanation of filters in chemical

Provide a detailed explanation of filters in chemical instrumentation and also describe detectors and a general subscription of the whole system.

In this chapter we have discussed several different forms

In this Chapter we have discussed several different forms of lithography (i.e. photo, electron beam, x-ray, high energy ion beam). Why do companies like Intel keep developing new lithographic techniques? What is the wave ...

1 what arc the fundamental differences between a thermal

1. What arc the fundamental differences between a thermal and a photon (quantum) d etector? 2. Assuming an in terband absorption mechanism, what is the cutoff wavelength for a semiconductor with a bandgap of 0.2 eV? What ...

B is open to the atmosphere the specific gravity for oil is

B is open to the atmosphere. the specific gravity for oil is 0.8, the distance h= 4 inches and the distance d= 6 inches. find the gage pressure and absolute pressure at A

Using diagrams or otherwise explain the 3 steps that are

Using diagrams or otherwise explain the 3 steps that are applied in operations of gas chromatograph.

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate