A little bit OT question about generating ntirogen

Jan Panteltje · 2011-07-07T10:55:27+00:00

I have been liquifying air no problem,but you get both liquid oxygen and liquid nitrogen, plus water ice.The liquid oxygen is a bit dangerous if you make a mistake.So looking for a 'cheaper faster better' way to make some relatively purenitrogen,spending many brain cycles on it, and web searches, I came up with 2 possiblesolutions.The first one is to use a standard compressor (as for car tires), and add thisthing: is called 'TyreSaver3, made in the US,and filters out the oxygen and inflates the tires with 95.5% nitrogen,all at reasonable pressures that I need.But it is a bit expensive at about 650 Euro ex VAT,But a very cool solution :-) The other one is a nitrogen generator from ebay, expensive, but 99.9 % pure nitrogen.It seems to use electrolysis and KOH as catalyser, and distilled water as input.Now here starts my question:what sort of reaction is this?N + O2 -> N and the O2 reacts with the KOH?Can I even buy KOH here without a special license? (they refused to sell me sulfer without a license duh).I think the TyreSaver3 is a cool solution though, so simple.Any suggestions?

Jul 07, 2011 22 Replies

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Jan Panteltje 15 years ago

On a sunny day (Thu, 7 Jul 2011 12:48:11 -0700 (PDT)) it happened George Herold wrote in :

ehh, I have the guidance system, ;-)

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Wanderer 15 years ago

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tje

=A0 =A0 =A0 ...Jim Thompson

Well not exactly. It's about moisture. PV =3D nRT is the IDEAL gas law. Moisture effects the pressure. That's why race cars use nitrogen in their tires. Also driving at 200mph for 500 miles makes the tires really hot, so reducing the combustibility inside the tire is helpful. There is some effect of moisture on pressure sensor life in the tire but you really don't need it in a normal commuter car.

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Jim Thompson 15 years ago

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"Moisture", what's that? Oh! I remember, that's the stuff you get when you don't live in the deserts of AZ or CA ;-)

They peddle it around here as "less leakage", which is a crock... air is already 78% Nitrogen to begin with. And Nitrogen-filled tires won't change pressure with temperature any less than with dry air. ...Jim Thompson

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