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Questions tagged [chemistry]

For engineering questions involving chemistry. For pure chemistry problems, please visit our sister site Chemistry Stack Exchange.

For engineering questions involving chemistry. For pure chemistry problems, please visit our sister site Chemistry Stack Exchange.

71 questions
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Nylon brittleness as function of moisture content

Can someone explain the how/why Nylons brittleness is to some degree a function of it's moisture content. I don't understand HOW the water content changes the elongation at break of the material. Water doesn't bond or change the chemistry of the…
Diesel
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How the choice of etchant can affect the severity of hydrogen embrittlement during pickling and passivation?

Following this question, I am trying to understand how/if the choice of acid we might use during the pickling and passivation of certain metals, can influence the severity of hydrogen embrittlement. To my best understanding, all etchants will induce…
Foad
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Is the rule of mixtures applicable for calculating the permeation of a mixture of gases?

Say we have 2 gases with permeation coefficients $P_{1}$ and $P_{2}$ when permeating a specific solid. If the permeating substance is now a mixture of the 2, can we say that the total permeation is $$P=f_{1}P_{1}+f_{2}P_{2}$$ with $f_{i}$ some…
moefbniw
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Am I a chemist or a chemical engineer?

I apologise if this is the wrong place to ask. I tried asking on reddit but so far I didn't get a lot of answers/ It seems that in America these two degrees are considered separate. Not so much here in Russia. By American standards would I be…
Iam Cleaver
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How would you calculate the sedimentation rate of a coarse chemical suspension under gravity using a centrifuge?

If the sedimentation rate can be determined for a coarse chemical suspension or a suspension containing large particles (i.e., particles with radii between 100 to 200μm) in a medium like vegetable oil, Can they also be determined if a centrifuge was…
Adrian . EXE
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Help with Mass Flow Rate

I'm a beginner in chemical engineering so apologies in advance if this question is very basic! The Problem You are required to measure the mass and volumetric flow rate of a slurry stream. The slurry contains only water and solids. You take a bucket…
air_nomad
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Why does aluminum clad steel wire have high corrosion resistance?

Why do aluminum clad steel wires have high corrosion resistance despite being two dissimilar metals? Does the aluminum act as a protective & sacrificial layer similar to zinc in galvanization or is there some other mechanism going on?
Fred I.
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Chemical engineering calculations - basis

You have a gas of the following compositions : 40% N2, 30% CO2, 30%,CH4 in a tank . What is the Average Molecular Weight of the gas if your compositions is based on molar ? I found that the AMR with basis set at $100$kg-Mol = $29.2$kg/kg-mol As Im…
user307640
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Is there a water quality standard for CIP (cleaning-in-place) that mention a specific value of water parameter (silica, calcium, magnesium, pH,..etc)?

In my company we already use RO water for CIP. Because there is an environmental permit issue regarding the effluent amount limit outside plant, i try to look up the possibility of using softener water for CIP instead of RO. The purpose is to reduce…
Fajrh
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Why marine steel is not always used in cooking applications

What are the main reasons why marine steel such as 1.4404 (316L) grade is not solely used in cooking and kitchen applications? Other than cost possibly? Why other grades such as 1.4301 (304) are so popular in applications dealing with cooking? If…
Imsa
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Solar distillation of sump pump water and the issue of Radon gas

Lately I have been thinking about designing and building a solar-powered water distiller that would be placed close to my house in my backyard. One thought that I have is installing a bypass valve on the pipe coming up from my sump pump so I can…
user33377
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Why don't we light the methane escaping from the NordStream pipeline?

The methane escaping from the NordStream pipeline for a few days now has a much more potent greenhouse effect than carbon dioxide. Burning methane gives us CO2. The pipe won't be repaired before all the gas escapes, and when it does, salt water will…
Akita
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Reactor tube material at moderately high temps (600-1000 C) with water vapor as primary constituent of flow

I work with a type of spectrometer (made by Picarro) that uses near-infrared lasers to measure the stable isotopic composition of water vapor. The samples measured are typically liquid water samples that are vaporized at 110 °C and then carried by a…
Jack Hutchings
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Fastest possible mean (peak?) piston speed on a Diesel engine

On a Diesel engine running distillate fuel (the kind you run in cars, SUV's, trucks, trains, boats, and smaller ships), what are the theoretical and practical limits to maximum mean piston speed you can achieve in an engine? On the low end, you have…
user10249
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Heat Transfer in a tubular reactor with constant jacket temperature - impossible solution?

I have received from my professor the following problem: A first-order exothermic reaction A -> B takes place in a tubular reactor (typical PFR). The tube is cooled to a constant wall temperature $T_w$ and the total amount of heat removed from the…
J Faller
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