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Liquid Tire Ballast
I've have never heard that even number alcohols are safe.
Ethanol is relatively safe (healthwise), of course. For example, butyl alcohol has 4 carbons and is as bad as propyl alcohol that has 3.
The azeotrope does not imply flammability. The azeotrope is simply the point that a mixture emanates vapors with the same composition as the liquid. Ethanol/water occurs at 95/5. All this means is that you cannot distill and ethanol / water mixture to an ethanol purity greater than 95% with simple distillation. There are tricks to doing it but much to complicated to discuss here. So not all mixtures of ethanol and water are flammable. So in this sense you are just fooling yourself if you think
methanol/water is safer because of a no azeotrope. I don't know how well ethanol suppresses freezing point versus methanol. However,
natural ethanol (not denatured) is going to be taxed sky high so there isn't much incentive to use it. If you are a lab you can probably get a
tax exemption. Denatured ethanol is probably as toxic as methanol.
I didn't have time to check if the 1/14 methanol to water is flammable.
Flash point test is the only way to be sure. Should get supplier to verify it.
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Ultrafiltration is for higher molecular weight molecules, something
on the order of 50,000 - 100,000. Next comes nanofiltration. Reverse Osmosis is next. Too clarify, the filtration process is RO. RO requires pressure to push the fluid from the concentrated side to the dilute side. Osmosis is the reverse process and will occur unaided until the pressure on the concentrated side of the membrane reaches a certain level.
When I get a chance I am going to calculate the activity coefficient
of 7% methanol in water at about 75 F. Should be able to calculate if the vapors are flammable at that point..
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Liquid Tire Ballast
With all the hassle of worrying about corrosion and toxic liquid ballast, etc. it looks like we are just making a great argument for wheel weights that attached to the hub. That's what I am going to do when I need them.
Under what circumstances do you really need them? If you have
an FEL you need back ballast or weights. I cut grass on hilly ground here with a TC33D/Bush Hog SQ600. I don't have any ballast or weights on the back tires. May need weights on the front but it isn't a big issue right now.
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One thing this thread has convinced me of - I'll never put liquid ballast in my compact tractor. I'll do the wheel weights if I need them. Who needs the headhaches?
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Someone should go into the tire weight making business. They could do really well.
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Liquid Tire Ballast: New Holland Tractor Review -- New Holland Tractors Discussion Forum
03-24-2002, 18:29 
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