For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion
Aluminum and cast iron
Inconel and nickel
Cadmium and Zinc
Low Carbon steel and copper
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1. Why organic solvent is often used in liquid-liquid extraction?
2. Name the adverse effects which occur when a trayed absorption tower operates at too high and too low vapor flow rate?
3. Component separation involving two or more phases (regardless of technique) occurs because systems want to achieve equlibrium and as a result, mass transfer occurs. In a scenario where this mass transfer is particularly slow, would it be more accurate to model a system based on phase equlibrium or mass transfer? Explain.
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In 1800 the main fuel used in the US was wood. (assume wood cellulose is C6H12O6). In 1900 the main fuel used was coal ( assume coal is pure Carbon) In 2014 the main fuel is oil(assume it is isooctane) Assume that oin 2100 the main fuel will be Hydrogen(H2). Use a spreadsheet to prepare a graph of carbon dioxide releasedper kilojoule of energy produced.(y axis), as a function of year (x axis) from 1850 to 2050
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what would be an example model for artificial intelligence to treat pancreatic cancer ?
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Pressure Steam
Vapor Compression
Heat Recovery
Reverse Osmosis
Include a sketch (2 pts each) of each system with components labeled, explanation (3 pts each) of the process, advantages and limitations (2 pts each), the typical size (1 pt each) of the shipboard plant types, current applications (1 pt each) and future trends (1 pt each)
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Metallurgy question:
Reagent addition is very important to the froth flotation process. In this regard, below are several reagent(mineral)/mineral combinations. Give the expected response the reagent will have on the mineral in terms of its surface chemistry and flotation behavior. In all cases identify the reagent in terms of its appropriate flotation term (i.e. collector, activator etc.).
a. xanthate/FeS2 (pH 10)
b. Cu++/ZnS
c. dextrin/coal
d. oleate (oleic acid)/ BaSO4 pH 10
e. dodecylamine/SiO2 pH 5
f. dodecylamine/SiO2 pH 1.5
g. Fe2O3 particles (1 micron diameter)/ SiO2 particles (100 micron diameter), note desire to concentrate SiO2 with dodecylamine collector, pH 5.
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The reaction, C2H6(g) + Cl2(g) àC2H5Cl (g) + HCl (g), occurs in a continuous flow reactor. 100 mol/hr of ethane and 125 mol/hr chlorine gas @ 25°C are fed to the reactor. Assume complete reaction of ethane. The reactor exit stream temperature is 200°C. Calculate the moles of each component of the feed and exit streams and the extent of reaction z. Calculate the heat released or absorbed (specify which) from the reactor using the heat of reaction method. The chloroethane heat capacity can be found in Perry's. For the Cpvalues from Table B.2 in your text, you may use just the “a” and “b” terms for simplicity.
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Metallurgy/Flotation question:
It is desired to float pyrite, FeS2, from coal. Describe a method by which this could be accomplished. In this description include all solution conditions and chemical additions required for the pyrite to be stable at the air/water interface. Clearly justify why flotation is either occurring or not for each solid type present.
If quartz, SiO2, were present in this system would it float with the FeS2 under the conditions you described above, why or why not?
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On a chromatographic column one meter in length, operating with an efficiency of 10,000 plates, the retention time of ?-chlorestne and ?-chlorestne are 4025 and 4100 seconds respectively. If these two compounds are to be separated with baseline resolution, can the desired separation be accomplished using this one meter column? The dead time of the column is 480 seconds.
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Eastown Industries conducted a Management of Change review for switching to a new propylene dichloride supplier. The propylene dichloride was purchased in railcar quantities and unloaded into a large storage tank, from which it was metered into 55 gal drums for sale to customers. During the Management of Change review, it was identified that the supplier sometimes used aluminum railcars for other products. The shift supervisor raised the question of what would happen if the propylene dichloride was received in an aluminum railcar and remained on the siding for a few days before unloading its contents into the storage tank. 9 Use the NOAA Chemical Reactivity Worksheet (CRW) as a resource to decide if the propylene dichloride is compatible with the al
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A sandstone has a porosity of 25% and permeability of 300 md. Calculate the surface area Sp, the specific surface area per unit pore volume.
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A liquid octane (C8H18) enters a combustion chamber of a gas turbine stationary at 1 atm and 25 °C, and burns with 300% of excess air that enters the chamber in the same state.
Determine the heat of combustion if the products come out at 226.85 °C (kJ/kg)
Determine adiabatic flame temperature (°C)
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A thermopane window consists of two pieces of glass each 0.1"
thick separated by a layer of dry,
stagnant air .4" thick.
• Find the resistance of a 4 ft × 3 ft thermopane window.
• Suppose the window is made by fastening an aluminum border .1"
thick all around the edge.
Find the total resistance for this configuration.
• As an alternative to the aluminum, we might use a border of .75"
thick white pine. Find the total
resistance for this configuration. (For white pine, "across the
grain", k = .087 Btu/hr ft °F).
• Calculate the heat loss for the two windows and compare with that
for a single pane of .1" glass.
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For my lab on depositing thin films on a surface via thermal evaporation I was asked hat would have happened if we had obtained different color metals on the samples after the thermal evaporation? The only thing I can think of is there was a leak in the vacuum chamber so a nonintended product could have formed via chemical reaction or chemical mixing. Can someone please give me a clearer answer. Thanks!
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