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Questions tagged [chemical-engineering]

For questions about processes in commercial chemical manufacturing.

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What would be a stable way to hold lithium hydride powder?

I currently have 100 grams of lithium hydride powder that needs to be held in a solid form. Initially, I was considering using cement, however, the moisture require converts the lithium hydride to ...
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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 ...
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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mixture ($\pu{20 mol\%}$ $\ce{CH4}$ and the balance is $\ce{C2H6}$) enters a tank at a velocity of $\pu{1 m/s}$ and is withdrawn at a rate of $\pu{2 kg/s}$.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 ...
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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)...
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Is there a chemical reaction between tungsten carbide and acrylic?

My company machines acrylic (Poly(methyl methacrylate) $\ce{(C5O2H8)_n}$), and notices that tungsten carbide tools break down quickly compared to high-speed steel, even though carbide is harder and ...
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Creating a pressure vessel to make emeralds and rubies/sapphires

So I understand that this is going to be a very difficult thing to properly do but I am looking to create a vessel for growing crystals. I am not looking to build a Verneuil furnace bit rather a ...
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Reference conditions for balances on nonreactive processes

In one of the examples in my book (Elementary Priniciples of Chemical Processes) where I am asked to calculate the rate of heat input required to heat a stream of methane and air from 20°C to 300°C, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?