About the same time Rossel and Landriset pointed out
that purification might be easily effected in all generators of the
carbide-to-water pattern by adding to the water of the generator itself a
quantity of bleaching-powder equivalent to 5 to 20 grammes for every 1
kilogramme of carbide decomposed, claiming that owing to the large amount
of liquid present, which is usually some 4 litres per kilogramme of
carbide (0.4 gallon per lb.), no nitrogen chloride could be produced, and
that owing to the dissolved lime in the generator, chlorine could not be
added to the gas. The process is characterised by extreme simplicity, no
separate purifier being needed, but it has been found that an
introduction of bleaching-powder in the solid condition is liable to
cause an explosive combination of acetylene and chlorine, while the use
of a solution is attended by certain disadvantages. Granjon has proposed
impregnating a suitable variety of wood charcoal with chlorine, with or
without an addition of bleaching-powder; then grinding the product to
powder, and converting it into a solid porous mass by the aid of cement.
The material is claimed to last longer than ordinary hypochlorite
mixtures, and not to add chlorine to the acetylene.
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