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On the Issue of Methanol Flammability - July
25, 2002
The following
two questions were posed to us in the summer of '02 by
CECOM:
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"If
you hold a match over pure methanol [MeOH] in air a fire is likely
because the MeOH vapor over the liquid is within the flammability
limits. Looking at the other end if you have 99 per cent water - 1
per cent MeOH by weight and you hold a match over the liquid in air
what happens? Nothing we expect. Question is what happens between 1%
and 100% MeOH. Adding to the problem are the different evaporation
rates of the MeOH and water...."
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"Given
a round gallon can of liquid open to air. Start with a 50/50 mix and
show what happens to concentration and volume with time. Also, seal a
half full can. What is the pressure and composition of the vapor at
say 150
ºF."
Click
here for the answers.
[Site maintained by Vijay A.
Sethuraman; Date last updated:
March 10, 2007]
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