Acetylene torches
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How does it work?
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The acetylene obtains by hydrolysis of the
carbide of calcium (by bringing down gout with gout the water on the
carbide), itself prepared by reaction the carbon enters (in the form of coke)
and the lime, in very high temperature in an electric oven (2200°C) 3 C + CaO ® CaC2 + 2 CO CaC2 + 2 H2O
® HC º CH + Ca(OH)2 |
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The acetylene (Eb =-83°C) is gas in common
temperature. The forming(training) of the acetylene according to the reaction
2C + H2® C2H2 is endothermique (DH = + 230 kJ.mol-1). The
acetylene is, for that reason , unstable. It tends to decompose into carbon and
dihydrogène, in a sometimes violent way, especially if it is compressed or
liquefied. (1)
The advantage of this mode of
lighting likes in its longevity
Where
find lamps ? 
Hypermarkets
of the sport : Décathlon – Le vieux
campeur :
count about 100 Euro Plastic most of
the time to gain weight, but with the immense advantage of power hang
on(collide) the beak and its reflector on the helmet, while the body of the
lamp pend weakly in your belt.
The
secondhand trades :
if your region is one so much is little chalky and hollow, it would be very
surprising not to find there . It is generally lamps which one carries(wears)
in the hand and which dates the first half of the century. The price can vary
from 10 Euro to 150 Euro even more for the details of collection. Verify before
buying that the beak is not narrow-minded and that the lamp is not cracked or
drilled. Please , also verify the state of the joint of the chamber with
carbide. If this one is dry and stiff, please , distrust, the waterproofness
will not be assured. If it is the only defect of the lamp, you can easily adapt
a rubber for conjoint jars, that works well magnificently.
Barbes
(at Paris) :
Here is the equivalent of the Big General store of Istanbul, with its
multicolored shops where everything piles up in a feigned disorder. Please , go
from a military surplus to the other one, you will manage certainly to find a
which(who) of it will sell you new of it for 23 Euro (with there premium, 2
extra beaks, rare foodstuff). There are enough young people in Paris visiting
catacombs not to arouse the slightest interrogation on behalf of the salesman.
Where find some carbide ?
You can there find in the
agricultural cooperatives for a modest price. About 21 Euro for 5 kg, what assures(insures)
you several hundreds of hours of lighting. If you leave in expedition, do not
however neglect the good hurdy-gurdy MAG-LIGHT, the light bulbs and the extra
pile, 2 lighters and a quantity of sufficient(self-important) water. It is
better two precautions that one, underground your life depends on it !!!
Acetylene torches
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