- The gas phase oxidation of nitric oxide is given as; 2NO+ O2 --> 2NO2

?rO2 = k(CNO)^2 (CO)^2 kmoles/m3 .h

The feed stream containing 9% NO, 8% O2, 1% NO2 and 82% N2 is fed to an isothermal PF reactor with a rate of 10000 m3 /h at 450oC and 2 atm. The reaction rate constant is given as 0.7x104 (kmoles/m^3 )^-2 h^-1

a) Setup a stoichiometric table and express the concentration of each species in the reaction as a function of conversion by evaluating all constants.

b) Calculate the reactor volume in order to achieve 5 moles of NO2 per mole NO in product stream

A saturated liquid feed composed of 30 % mol Benzene (B), 30 % mol Toluene (T) and 40 % mol p-Xylene (X) is separated by an isobaric column operating at 1 atm. The feed flow rate is 1 kmol/hr. Toluene is the light key with a mole fraction in the bottom stream equal to 0.1. The heavy key has a mole fraction in the distillate stream equal to 0.05.

1- Find the optimal design using shortcut methods tool of Aspen-HYSYS assuming a Reflux ratio, R, approximately equal to 1.6*R_min.

2- We propose to separate this BTX mixture using a distillation train composed of two columns.

2a- Run the simulation using Aspen-HYSYS.

Hint: The design of first column, determined in Q.1, should be adopted. Also, you should determine a suitable design for the second column using shortcut methods with the dedicated tool of Aspen-HYSYS.

2b- Are we using the indirect or direct split configuration?

3- For the first column, study the effect of changing the feed tray location on the utility duty of the reboiler and condenser. What do you conclude?

4- Separate this same feed (i.e., BTX mixture) using only one column but with a liquid side stream. You should get three product stream (one rich in X, the other rich in T and the last rich in B).

Can someone show me how to do it using hysys?

Determine the transfer function H(s)/Q(s) for the liquid-level system shown in Fig. Resistances R1
and R2 are linear. The flow rate from tank 3 is maintained constant at b by means of a pump; i.e.,
the flow rate from tank 3 is independent of head h. The tanks are noninteracting

What does natural gas processing include (at the field level)?

What is the general approach used in Nylon polymerization to get high molecular weights?

Styrene is almost a unique monomer, in that it can be polymerized by practically all methods of chain polymerization.

A. Free radical

B. Anionic

C. Cationic

D. Co-ordination (i.e., with a catalyst)

Which of these methods would you use to make isotactic polystyrene? why?

Waste management: What are the main forms of waste produced in the petrochemical industry and how are these maanged using recycling, reusing, incineration, landfills, and composting?

In the game of craps, people bet on the outcome of the throw of two, six-sided dice. Specifically, wagers are placed on the sum of the outcome on the upward facing number on each of the two dice. We are going to discuss relative likelihoods by counting the number of ways (the number of microstates) associated with specific sums (the macrostate).

A. How many microstates are associated with a throw summing to 4?

B. How many microstates are associated with a throw summing to 5?

C. How many microstates are associated with a throw summing to 10?

D. Which is more likely, rolling 2 dice that sum up to 4 or rolling 2 dice that sum up to 5?

E. Which is more likely, rolling 2 dice that sum up to 4 or rolling 2 dice that sum up to 10?

The following module data are those for the DuPont B-10 permeator

Membrane recovery ratio: 35%

Salt rejection: 99.2%

Maximum applied pressure: 6895 kPa

Minimum brine flow rate: 1.584 m³/d

Maximum brine flow rate: 14.256 m³/d

Permeate flow rate: 2.46 m³/d

Design Data

Feed salinity is 42,000 ppm

Permeate flow rate: 5000 m³/d

Permeate pressure: 101 kPa

Design a single stage system by calculating the number of modules, osmotic pressure, permeation pressure difference, flow rates, and stream salinity.

Problem 1

Rectification. McCabe-Thiele Method. A mixture of benzene-toluene is to be distilled in a fractionating tower at 101.3 kPa. The column is fed 120 kg mol /h of a saturated liquid at the boiling point with 60 mol % benzene and 40 mol % toluene. The content of the distillate is 92 mol % benzene, and of the bottoms 5 mol % benzene. The reflux ratio is 3:1.

(a) Calculate the kg mol/h distillate: D=_______

(b) Calculate the kg mol/h bottoms: W=__________

(c) Attach the plot with the equilibrium line, 45? degree line, q-line, enriching and stripping operating lines, and stepping off the trays. Show with the dashed lines the stepping off assuming the Murphree tray efficiency is 0.5.

(d) Identify the position of the feed (the tray number) and inidicate the relative position of the feed to the tray: feed from bottom, from top, or both from top and from bottom.

Feed on tray ______from__________

(e) Determine graphically the theoretical number of trays:

N= _________plus a reboiler

(f) Determine graphically the actual number of trays for the case of Murphree efficiency

0.5:
N= ______plus a reboiler

(g) Calculate the overall tray efficiency in case of 0.5 Murphree tray efficiency: E0 =

(h) Attach the plot with the equilibrium line, 45? degree line, q-line, and enriching and

stripping operating lines for the case of minimum reflux ratio.

(i) Identify the point of intersection of the enriching operating line and q-line for the case of minimum reflux ratio:

x= _______y=_______

(j) Find minimum reflux ratio:

Rm=________

Estimating random-packed tower height. Consider random-packed tower in which distillation is performed under the same conditions as in Problem 1. Using 2-in Metal Intalox rings, calculate the HETP and the height of the tower.

(a) HETP=____
(b) The tower height par H= ______

Compare and contrast the key characteristics of anionic polymerization and conventional free-radical polymerization

What is the difference between HIPS and ABS in terms of chemical compositions? Explain the toughening mechanism associated with those two types of plastics.

Agricultural irrigation uses a significant amount of water, and in some regions it has overwhelmed other water needs. Suppose water is drawn from a reservoir and delivered into an irrigation ditch. For most of the length of the ditch, the delivery is through a 10-cm ID pipe, and in the last few meters the pipe diameter is 7 cm. The exit from the pipe is 300 m lower than the pipe inlet.

(a) Assume that the pipe is smooth (i.e., ignore friction) and that the delivery rate is 4000 kg/h. Estimate the required pressure difference between pipe inlet and outlet. How far below the surface of the reservoir is the pipe inlet?

(b) How would your answer be different if the pipe were not smooth? Explain.

(c) What are possible environmental impacts of diverting significant quantities of river water for use in irrigation? Cite at least two sources for your response.

a. Draw a process diagram to produce AlN powders by carbothermic reduction process. Include all possible steps, and briefly explain each step if needed.

b. In this process, what would be the keys to obtain high quality sinterable AlN powders?