The ordinary allowance is 1 lb. of heratol for every cubic foot per hour
of acetylene passing, with a minimum charge of 7 lb. of the material. As
the quantity of material in the purifier is increased, however, the flow
of gas per hour may be proportionately increased, _e.g._, a purifier
charged with 132 lb. of heratol should purify 144 cubic feet of acetylene
per hour.
In the systematic purification of acetylene, the practical question
arises as to how the attendant is to tell when his purifiers approach
exhaustion and need recharging; for if it is undesirable to pass crude
gas into the service, it is equally undesirable to waste so comparatively
expensive a material as a purifying reagent. In Chapter XIV. it will be
shown that there are chemical methods of testing for the presence, or
determining the proportion, of phosphorus and sulphur in acetylene; but
these are not suitable for employment by the ordinary gas-maker. Heil has
stated that the purity of the gas may be judged by an inspection of its
atmospheric flame as given by a Bunsen burner. Pure acetylene gives a
perfectly transparent moderately dark blue flame, which has an inner cone
of a pale yellowish green colour; while the impure gas yields a longer
flame of an opaque orange-red tint with a bluish red inner zone.
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