On Fri, Jun 18, 2010 at 7:10 PM, Randall <tr3driver@ca.rr.com> wrote:
>> Ok - so whats the difference between Butane and Propane anyway
>
> Not a whole lot, but they have slightly different properties. B Butane is
> C4H10, while propane is C3H8. B Butane has a lower boiling point, so works
> even in extremely cold weather, while pure propane can have problems when
> it's really cold.
butane doesn't work below ~freezing. Boiling point is, as I recall,
just below 0 C. Iso-butane boils about -10 C. (most commercial
butane fuels are a mixture of the two, typically 80% butane 20%
iso-butane, but the mix varies from supplier to supplier. (Iso-butane
is a bit more valuable than butane; it's used as a refrigerant, and as
feedstock in some chemical reactions). Propane has a boiling point of
about -40. (Commercial propane is a mix of propane, butane,
iso-butane, and a others; ratios vary wildly. Most US propane is
pretty much propane. )
Butane has about 20% more energy per kilogram than propane, and a bit
less than natural gas.
--
David Scheidt
dmscheidt@gmail.com
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