Beside the impurities thus inevitably arising from the calcium carbide
decomposed, however, other impurities may be added to acetylene by the
action of a badly designed generator or one working on a wrong system of
construction; and therefore it may be said at once that the crude gas
coming from the generating plant is seldom fit for immediate consumption,
while if it be required for the illumination of occupied rooms, it must
invariably be submitted to a rigorous method of chemical purification.
IMPURITIES OF ACETYLENE.--Combining together what may be termed the
carbide impurities and the generator impurities in crude acetylene, the
foreign bodies are partly gaseous, partly liquid, and partly solid. They
may render the gas dangerous from the point of view of possible
explosions; they, or the products derived from them on combustion, may be
harmful to health if inspired, injurious to the fittings and decorations
of rooms, objectionable at the burner orifices by determining, or
assisting in, the formation of solid growths which distort the flame and
so reduce its illuminating power; they may give trouble in the pipes by
condensing from the state of vapour in bends and dips, or by depositing,
if they are already solid, in angles, &c.
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