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Questions tagged [chemical-engineering]

Use this tag for questions within the problem domain of chemical engineering.

358 questions
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How do I choose operating parameters for input air to a methane reformer?

I'm interested in controlled oxidation of nickel in a methane reformer with diameter ~3 m and height ~1.5 m. In this reactor, CH4 is converted into H2 and CO, and CO into H2 and CO2 but for this problem, we assume that the methane and water stopped…
Corvinus
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Degassing silicone solution with negative pressure

I am planning to use polydimethylsiloxane (PDMS) to create a phantom for mimicking tissue for imaging. For this, I plan on using SYLGARD® 184, which is a viscous liquid. When adding other components to it, air bubbles will be introduced. I have…
Nazar
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Calculating the minimum reflux ratio for separation of Acetone and Chloroform

Acetone must be recovered from a waste process stream, which also contains chloroform , so that it can be reused in the chemical process. The chemical process requires however that before the recovered acetone can be reused in the process that…
Cian
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foam earplugs: what’s the composition of the (non washable) substance that slow down their expansion?

What’s the composition of the (slighlty sticky) substance we find on foam earplugs that allow them to be easily moldable? This substance slows down the expansion of the foam, so it makes the foam a little bit more rigid and help the foam to stick…
Lisa
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Dealing with condensation procedures in porous membranes

I came across this publication: Do, H. D., & Do, D. D. (2001). A new diffusion and flow theory for activated carbon from low pressure to capillary condensation range. Chemical Engineering Journal, 84(3), 295–308.…
matthis
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Distillation modelling McCable Thiele, Chemical Engineering

I am using an extractive distillation column to seperate ethanol and ethylene glycol. I am trying to find Rmin however its proving difficult as the the top operating line, q-line and bottom operating line do not to intercept the VLE curve. I have to…
John Knowles
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Chemical oxygen generator

3enter image description here Why airborne chemical oxygen generator has shelf life? What causes deterioration of the generator which are not used during long time? The generator comprises Sodium Chlorate (NaClO3) mixed with <5% Barium Peroxide…
DYNAMICS
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Is mechanical work done when the valve of a filled gas cylinder is opened for gas to flow through the pressure regulator and connecting line?

I am trying to calculate the final pressure and temperature in the pressure regulator and connecting line of a gas cylinder when the valve is open to pressurize the line.
Isaac
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How to safely experiment with wood pyrolysis?

I have been thinking about how to make a carbon negative BBQ. The idea would be, use sustainably grown wood (so you start nearly carbon neutral) and pyrolyse some of it, and bury the resulting carbon. There are some fairly simple examples of home…
ealdwulf
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Reaction of Components with Methyl Ethyl Ketone makes it corrode. How to prevent?

I have an issue with chemical plating of Iron, the component is immersed in Methyl Ethyl Ketone for a time span and then Zinc galvanized plating starts to corrode. I am not understanding what measures should I take. I am not at all into chemical…
Ritesh Sharma
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How to furnace-melt bismuth oxide into optical glass?

I have been experimenting with a furnace at my house and am looking to attempt the more difficult process of creating bismuth-oxide based optical glass for the purposes of creating optical elements (think lenses and reflective glasses). I'm having…
nikk wong
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Interface level between 2 components in Liquid-Liquid Extraction, What does it mean?

In LLE physical processes, there is this level (interface) between the 2 components (for example) that is being separated as shown in the picture. I know that the height of this level from the reference point (0%) tells us the efficiency of…
user307640
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Can we engineer detergent micelles to pick up Microplastics?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can then be collected on the water surface and be…
Mayur
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Systems In "Thermodynamic Equilibrium"

I'm trying to find an answer to a question in one of my thermodynamics textbooks. (Undergraduate chemical engineering is the context). It is a conceptual question, asking, "Do all systems in equilibrium continue to be in equilibrium if they are…
TinyChickenSandals
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How widely used are ethylene receptor inhibitors in fruit packaging & shipping?

Ethylene works as a gaseous "aging" hormone for many fruits. There are lots of papers on ethylene receptor inhibitors (e.g. 1-MCP) to delay this process. I also found out that 1-MCP has been EPA-approved in 2002: In 2002, 1-MCP was approved by the…
the gods from engineering
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