(b) Explain the operating principles of a jaw crusher and a gyratory crusher. Under what circumstances would you consider replacing the jaw crusher in your process flowsheet with a gyratory crusher?

Hi there! I can not find solution of Octave Levenspiel Chapter 26. I need it immediately. Can you please help me!Thank you.

A solid feed consisting of

20 wt% of 1-mm particles and smaller

30 wt% of 2-mm particles

50 wt% of 4-mm particles

passes through a rotating tubular reactor somewhat like a cement kiln where it reacts with gas to give a hard nonfriable solid product (SCMI reaction control, T = 4 h for 4-mm particles).

26.3. Find the residence time needed for 100% conversion of solids.

26.4. Find the mean conversion of the solids for a residence time of 15 min.

26.5. Particles of uniform size are 60% converted on the average (shrinking core model with reaction controlling) when flowing through a single fluidized bed. If the reactor is made twice as large but contains the same amount of solids and with the same gas environment what would be the conversion of solids?

26.6. Solids of unchanging size, R = 0.3 mm, are reacted with gas in a steady flow bench scale fluidized reactor with the following result. F, = 10 gmlsec, W = 1000 gm, X, = 0.75 Also, the conversion is strongly temperature-sensitive suggesting that the reaction step is rate-controlling. Design a commercial sized fluidized bed reactor (find W) to treat 4 metric tonslhr of solid feed of size R = 0.3 mm to 98% conversion.

26.7. Solve Example 26.3 with the following modification: the kinetics of the reaction is ash diffusion controlled with T(R = 100 ~m=) 1 0 min.

26.8. Repeat Example 26.4 if twice the stoichiometric ratio of gas to solid, still at C,,, is fed to the reactor.

26.9. Repeat Example 26.4 if the gas is assumed to pass in plug flow through the reactor.

In a continuous distillation of a mixture of 40% A and 60% B with a flow rate of 10,000 kmol / hour, the volatile component composition is decomposed to 90% in distillate and 4% in boiler. Feeding is ¼ steam, ¾ liquid and partial condenser is used in the system.
a) Minimum ideal number of steps,
b) Minimum riflax rate,
c) Ideal stage number when the actual riflax ratio is 4.5 times the minimum value
d) Enrichment and peeling regions liquid and vapor flow rates (L, V, ?̅, ?̅),
e) If the average efficiency of the column is 0.5, the number of real steps,
f) Find the actual number of steps when n kad = 0.65

A triple effect forward-feed evaporator is used to concentrate 6 kg/s of 14% mass fraction of caustic soda at 75C to 47% mass fraction. Steam input in first effect is 150C. Vapour from the third effect is 39C at 7kPa. Overall heat transfer coefficient in effect 1, U1 is 3000 W/m2 K, effect 2, U2 is 2000 W/m2 K and effect 3, U3 is 1250 W/m2 K.

Find boiling point elevation in each effect.

When corn starch is added with water at 2:1 ratio and you apply strong force, the mixture will behave like solid. However, when you apply slow and steady force on the mixture, it will behave like liquid. Describe how this mixture can behave as a solid and liquid when different force is applied? Mention the type of non-Newtonian fluid for this mixture.

Q. In the worst-case scenario related to casing collapse pressure, explain from a practical point of view why the casing internal pressure is considered partially or completely empty. In other words, under what conditions the casing string can be empty or partially empty.

(Note: This question needs to be answered in the context of Petroleum Drilling Engineering advance level)

Please answer this question by typing. The answer should be one page A4.

1. Reynolds experiment is used to study flow behavior of fluids by slowly and steadily injecting dye into a pipe. The state of fluid flow will be determined and compared with the results from the calculation of the Reynolds number.
   1. Discuss observations made in the Reynolds number.
   2. Analyze various factors which effect the flow of fluids.

One of the classical models of epidemics is due to Kermack and McKendrick (1927). The model considers three classes of individuals: at time t, I(t) is the number of infected people in the population, S(t) is the number of non-infected susceptible people, and R(t) is the number of “removed” people (either cured or deceased). This model is often referred to as the “SIR” model (where each letter is pronounced, or pronounced as the word “sir”). The equations of the model are

S’(t) = −r*S*I

I’(t) = r*S*I − γ*I

R’(t) = γ*I

5. (8 pts) Eliminate t from the S and I equations to give a single ODE relating S and I by dividing one equation by the other (and justifying this process by the chain rule). Solve this ODE and sketch the solution curves. Compare these solution curves to your direction field picture

A liquid mixture contains 60.0 wt% ethanol (E), 5.0 wt% of a dissolved solute (S), and the
balance water (W). A stream of this mixture is fed to a continuous distillation column
operating at steady-state. Product streams emerge at the top and bottom of the column.
The column design calls for the product streams to have equal mass flow rates and for the
top stream to contain 90.0 wt% ethanol and no S. (Hint: In order to solve this problem, you
will need to assume a basis for calculation (100 kg/hr), draw and fully label a process flow or
block diagram, and check to make sure that it can be solved for all unknown stream flows
and composition). What is the flowrate of the bottom stream (in kg/hr)?

A. 10-25 kg/hr
B. 26-50 kg/hr
C. 51-75 kg/hr
D. 76-100 kg/hr
E. 100 – 125 kg/hr

answer these two questions

1. Recent developments made in packed and fluidized bed columns

2.Why natural processes are irreversible, explain by taking real life examples.

For a creeping flow, find the viscosity of liquid. Given: solid sphere, 8.0mm=D, density= 1200 kg/m^3 is released in a liquid with density= 1100 kg/m^3 at a terminal velocity 9.00mm/s

3. A 200 lbmol/hr stream that is 95 mole% methylformate and 5% methanol is to be recovered from top of a distillation column. The feed to the column is 20 mole% methylformate and 80 mol% methanol, and 98% of the methylformate entering the column is contained in the distillate stream leaving the top of the column. (30 points) • Draw and label a flow chart of the process and do the degree of freedom analysis • Calculate the mass and mole fractions of methanol in the bottom stream and determine the molar flow rates of methanol and methylformate in the bottom and feed streams. Molecular weight of methanol = 32.04 g/mol Molecular weight of methylformate = 60.05 g/mol

1. A mixture is 15 mol% Benzene, 40 mol% Toluene and 45 mol% Xylene. Calculate the mass fraction of each compound. What is the average molecular weight of the mixture? What would be the mass (kg) of a sample containing 250 kmol of Toluene ? (20 points) Benzene (C6H6) – 78.11 g/mol Toluene (C7H8) – 92.13 g/mol Xylene (C8H10) – 106.16 g/mol

2. In crude oil refineries where the corrosion occurs are atmospheric and vacuum crude distillation and catalytic reforming. Corrosion also takes place in amine regenerators, boilers, sour water strippers, and hydrogen manufacturing units. Corrosion in these locations is caused either by contaminants present in the crude oil is introduced to the process equipment or by species generated by the different processes. Provide a suitable method to prevent the corrosion formation in the refinery units with a suitable process diagram and explain. (5.0

Compute the pressure drop associated with the flowrate in the column using the Carman-Kozeny equation for d = 0.1 mm. What are the assumptions associated with the application of this expression for the pressure drop? Can such assumptions be considered valid for this system, and why or why not?