Chemistry Stack Exchange
Chemistry Stack Exchange

Questions tagged [applied-chemistry]

Chemical processes and theories being used in practical and experimental applications.

103 questions
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Food-grade antifungal preservatives for alcohol-containing aqueous non-food product that won't UV-yellow when dried?

I need a broad-spectrum antifungal (yeast and mold) agent for an aqueous non-food product (pH $\simeq$ 6) that contains 20% v/v alcohol (ethanol or isopropanol). A key requirement is that it not UV-yellow if it comes into contact with textiles…
theorist
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Why is my rusting metal chainlink fence glowing bright orange and sparking?

This is a really practical question, but I can't find anything on Google. My metal chainlink fence is rusting and I have noticed that where the metal from one wire makes contact with another wire there is a point of bright orange glowing which…
David Pivato
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Particle size-energy distribution

I am not chemist, I am mathematician and interested in Population Balance Equations. I have a question about particle size-(breakage) energy distribution which mentioned in this article:…
Lynx
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Lubricants and rubber

I've been reading a lot of conflicting articles/threads pertaining to which lubricant is compatible with rubber/plastics and I'm stumped. From what I've come across, the consensus is that silicone is safe to use on rubber and that petroleum based…
ohmmy
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Is N-methylimidazole an unusual solvent, or are there more common substitutes for it?

I want to test a process that was documented in the literature using N-methylimidazole. I am not doing academic research, but rather testing a documented reaction for application to an industrial process, so I don't believe I need lab-grade…
feetwet
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gas chamber for calibrating gas sensors

I have $\ce{CO2}$, $\ce{CO}$, $\ce{O2}$ sensors and need to calibrate them. Can anybody help me to produce the $\ce{CO2}$, $\ce{CO}$, $\ce{O2}$ in laboratory for calibrating the sensors (the gas should be produced in known in $\mathrm{ppm}$)
yogece
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Bonding Carbon Fiber to Metal

I have an application for a very thin, strong, electrical conductor that need to act as a (almost) frictionless support "rope". Typically materials like tungsten wire or platinum-iridium alloys have been used. I was wondering about carbon fiber.…
Dirk Bruere
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Reactor mass balance with solid feed and overflow

I am modeling a lime slaker which is basically a stirred tank reactor with two separate feeds: 1. CaO feed screw (powder) 2. H2O binary valve (liquid) These react according to the reaction: $\ce{CaO(s) + H2O(l) -> Ca(OH)2(s)}$ The slaker is operated…
jannekem
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Effectiveness of getters to keep gasses sulfur free

My engineering task poses a problem with sulfur damaging electronic components. There are enclosed gas volumes which contain sensitive electronic devices as well as NBR sealings and gaskets. The sealings can evaporate sulfur in different compounds,…
Ariser
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"Chemicals" released in headphone with burned cable

My friend works at a headphone company at the support service and today she came across someone who claimed that he threw his broken headphone away because he had heard dangerous chemicals could be released when the cable burned through (because…
David Mulder
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Rotovapping Aqueous Solutions - Need a cold trap?

I am working on a large scale natural product Rotovapping project. There are two botanical extracts to evolve, combined in processing. The solvents are 50% EtOH and 50% glycerin. There is a large volume of material to dry that will require several…
Ryan
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Steel Wire Rusting & Glowing Orange

In my backyard I have a DIY wire trellis made in part by wrapping a steel wire around a water wellhead. I noticed out the window in the dark a tiny pinprick of orange / yellow light coming from the area, and upon closer inspection it originated from…
fedora
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Wax and oil polish on wood

Wood countertops are frequently sealed, when a non-hardening, food-safe finish is desired, with some magic cocktail of waxes and oils. Typical components might include mineral oil, beeswax, and carnauba wax, mixed in some unspecified ratio and then…
Phil Frost
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How to desalinate seawater at freezing temperature or high pressure?

The deep ocean depths have very high pressure and freezing temperatures. Could one or both of these characteristics be used to desalinate seawater? Reverse osmosis uses high pressure to separate salt from seawater to make freshwater. Freezing…
Jack
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Dangerous chemicals from plastic

When the plastic of water bottles is exposed to light some atoms come off from it and blend with the water, so my question is which are the chemicals and its effects
user162485
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