[AT] @$#@$#% Cub - red engine oil

[David Bruce]

An azeotrope is a physical mixture and not a unique compound.  I would 
expect to be able to remove the bulk of the water in an antifreeze/water 
mixture by evaporation but not all.  If I remember correctly there is an 
azetrope with certain proportions of each - water in excess of that 
would be free to evaporate without the ethylene glycol.  Exactly what 
proportions are needed I'm not sure.

I do know one azeotrope of water and ethanol is 95/5 water/alcohol - 
true anhydrous ethanol is quite hard to manufacture.  The azeotrope of 
methanol and water has a bit more water but is still flammable. This is 
why methanol is common in "dry gas" formulas.

David
NW NC



charliehill wrote:
> That could be right David.  It's just the first thing I thought of.  Not 
> sure about the chemistry.  If you are correct the water and antifreeze would 
> have to form a new compound and not just be a hydroscopic mixture I think.
> 
> Charlie
> 
> 
> ----- Original Message ----- 
> From: "David Bruce" <davidbruce at yadtel.net>
> To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
> Sent: Monday, August 17, 2009 7:28 AM
> Subject: Re: [AT] @$#@$#% Cub - red engine oil
> 
> 
>> Somewhere in the recesses of this tired brain (and in my college
>> textbooks) is the concept of an azeotrope - a physical combination of
>> two components that has properties quite different from the individual
>> components and is quite hard to separate by simple distillation.
>> Water and ethyl alcohol form such and I'm thinking water and ethylene
>> glycol (the major component in many antifreeze formulations) would do
>> the same.
>>
>> The various reference books that could answer are packed away but the
>> answer should be somewhere on the web.
>>
>> David
>> NW NC
>>
>> charliehill wrote:
>>> Heat it until it's somewhere between 212 and maybe 230 degrees in an open
>>> top container and the water will boil off and leave the antifreeze 
>>> behind.
>>> ( I THINK)
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