For questions about processes in commercial chemical manufacturing.
0
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0answers
6 views
Best efficiency for CSTR reactor between Sodium Hydroxide and Ethyl Acetate reaction?
I am doing my pre-lab understanding session before my lab session on CSTR.
In the reactor, the reaction going in is sodium hydroxide + Ethyl Acetate.
I was given 4 options on which is the most ...
1
vote
1answer
30 views
How do you figure out fuel specific impulse non-experimentally?
Simple question, probably very complicated answer:
Without building a test engine/rocket and finding out experimentally, that is to say, based on chemical characteristics alone, how can one compute ...
2
votes
1answer
14 views
What are standard controllers for automatic pH control?
My background in control theory comes from electrical engineering (robots, motors, etc.) and I want to build a control system for automatic pH control.
Can I directly apply my knowledge from ...
0
votes
0answers
32 views
Which phase offers resistance when oxygen is being absorbed in strong alkaline pyrogallate solution?
While solving a few questions from interphase mass transfer I came across this question. The question stated that when oxygen is being absorbed from air to water it is a liquid phase resistance ...
0
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0answers
12 views
Fluidized beds: transition from fixed bed
How can I understand when I do have a transition from a fixed bed to a fluidized bed? Should I take in account the pressure of the bed and its weight?
0
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0answers
34 views
Extraparticle transport limitations in het. catalysis: Varying Damköhler without affecting the external prater number (and vice versa)
Solving a question for exam preparation; In the lecture script it is asked:
1. When both external MT and HT limitations exist, derive a solution from the general mass and energy balances in terms ...
2
votes
1answer
40 views
Double surface in the pressure temperature concentration curve for a binary mixture
In the 3 dimensional diagram given, when a constant pressure plane intersects with the double surface, it produces a looped curve without a maxima or minima. What is the double surface and how is the ...
2
votes
1answer
42 views
Dependence of mass transfer coefficient on solubility
Does solubility of the solute affect the value of the mass transfer coefficient?
The book I am following mentions that the mass transfer coefficient is a characteristic of the constituent and its ...
3
votes
0answers
33 views
Do theoretical plates required to obtain a pure product decrease under vacuum distillation?
For this question I am using Ethanol as an example. The following is the vapor-liquid equilibrium diagram for Ethanol under atmospheric pressures.
Under reduced pressures do the number of theoretical ...
1
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0answers
22 views
Can diamond be grown on copper wires using chemical vapor deposition techniques?
I am asking this as a follow-up to another question I asked earlier. It is regarding how to make higher voltage transformers. Diamond is a good dielectric material and would be good for using as a ...
1
vote
0answers
55 views
PTFE-to-PTFE or PTFE-to-Copper pressure seal
I am currently working on an engineering project with a friend. Without giving too much away, I have two parallel strips of Zirconium-Copper alloy sandwiched between an upper and lower piece of smooth ...
-1
votes
1answer
31 views
How does cullet reduce the production temperature in glass production?
In my book, I read that broken glass pieces are reused in the production of glass, known to be cullet. This on one hand saves the production cost and also reduces the production temperature.
My ...
0
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0answers
23 views
What's the difference of the emission characteristics of pyrometallurgy and hydrometallurgy processes
I have learned about that pyrometallurgy and hydrometallurgy processes are two major method to refine the metal ores for industrial applications.
For some reason, I want to compare the different ...
0
votes
0answers
26 views
Max HCl concentration to not absorbed dry HCl gas
What can be the maximum concentration of HCL liquid under 1kg/cm2g pressure further which the dry gas cannot get absorbed?
When is the dry 99% HCL gas passed through this maximum concentration ...
0
votes
1answer
88 views
Electromagnetic energy to Chemical energy [closed]
How can electromagnetic energy (photons) be efficiently converted to chemical energy? For instance, can water be efficiently split to hydrogen and oxygen using solar energy? As we are running out of ...
1
vote
1answer
224 views
How to use a modified Peng-Robinson equation to calculate a density?
I'm trying to use the Peng-Robinson-Stryjek-Vera 2 (PRSV2) Equation of State to calculate the density of a compound, in this example: methanol. At ambient temperature and pressure, shouldn't I be able ...
0
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0answers
15 views
If a reactor made up of alloy has ceramic coating inside, can the temperature inside be raised to 500C?
I would like to get a reactor fabricated for plastic pyrolysis. The temperature would maintained around 520C. The material processed would be Waste Polypropylene and Polyethylene.
With the ceramic ...
0
votes
1answer
57 views
Stoichiometry of incomplete combustion
Methane is burned with air in a continuous steady-state combustion reactor to yield a mixture of carbon monoxide, carbon dioxide and water.
The feed to the reactor contains: $\pu{7.8 mole \% }\ce{...
3
votes
1answer
112 views
Mixing Supplements - Will the Distributions Remain?
I am combining various vitamins and minerals into a food supplement for my dog and I currently measure each powder individually for each batch of food each week. The supplements are in powder form ...
2
votes
2answers
51 views
Separation of solvent from residue of material. [closed]
I have a residue of 2kl in which 1.8kl is solvent (EDC) and rest material is residue. First i was thinking to go with normal distillation to recover our solvent. But i heared somewhere that there is ...
1
vote
1answer
48 views
What is the reason behind the 2% increase in silver metal composition just after melting the raw silver alloy (55% silver)? [closed]
I determined the silver composition from an alloy obtained from a jeweler to be 55% and wanted to extract silver out of it. However, upon melting around 5 kgs of alloy, the silver composition went up ...
3
votes
0answers
28 views
Determine whether the tank will overflow with mass flowrate
Hydrocarbon mixture ($\pu{20 mol\%}$ $\ce{CH4}$ and the balance is $\ce{C2H6}$) enters a tank at a velocity of $\pu{1 m/s}$ and is withdrawn at a rate of $\pu{2 kg/s}$. The tank is initially one ...
6
votes
1answer
277 views
A chamber to control concentration of a vapor: Is there a name for this equipment?
Mechanical engineer here so please excuse me if my question seems dumb to you!
I want to have a chamber $(\approx 40 \times 30 \times \pu{30 cm})$ to control concentration $(\pu{ppm})$ of a flammable ...
3
votes
0answers
209 views
What is the relation between pressure and chemical potential?
I know that in a two-component gas-liquid system (for simplicity) the chemical potential $\mu_i$ ($i=1,2$) and total pressure $p$ can be defined by
$$\mu_i=\left(\frac{\partial U}{\partial N_i}\right)...
-1
votes
1answer
217 views
Energy balance for a system [closed]
A hydropower plant uses a river to generate electrical energy. It has a drop of $\pu{107 m}$ and the flow rate of water is $\pu{275 m3 s-1}$. The flow rate of the water is the same in and out of the ...
7
votes
1answer
216 views
What are introductory level books on chemical engineering?
I'm currently enrolled in a chemical engineering course in my college, and in my first year, I'd like to get a nice introductory book on that field of study.
I'd prefer that the book covers several ...
1
vote
0answers
64 views
What is the process for chemical engineering? [closed]
I will be upfront -- I am not a Chemist, nor do I have much experience beyond high school Chemistry.
I have always had a vested interest in chemistry, but my engineers brain has always left me ...
2
votes
1answer
66 views
Conservation rule in closed systems
In a closed system the reacting species interconvert but do not leave the system. Therefore the amounts of different species in the system would be bound by a conservation rule.
A simple example:
...
8
votes
2answers
4k views
Selective etchant for Al2O3 (Does not etch Al, Cu, Zn, Sn)
I'm looking for a wet-etchant to remove aluminum oxide created by anodizing, but not etch the unoxidized metal (with greater than 10:1 selectivity)
I know about chromium(IV) oxide and fluorine-based ...
