He suggests incorporating it with a solution of some lead salt,
so that the latter may increase the capacity of the calcium hypochlorite
to remove sulphur. Analytical details as to the efficiency of this
process have not been given. During 1901 and 1902 Bullier and Maquenne
patented a substance made by mixing bleaching-powder with sodium
sulphate, whereby a double decomposition occurs, sodium hypochlorite,
which is equally efficient with calcium hypochlorite as a purifying
material, being produced together with calcium sulphate, which, being
identical with plaster of Paris, sets into a solid mass with the excess
of water present, and is claimed to render the whole more porous. This
process seemed open to objection, because Blagden had shown that a
solution of sodium hypochlorite was not a suitable purifying reagent in
practice, since it was much more liable to add chlorine to the gas than
calcium hypochlorite. The question how a solidified modification of
sodium hypochlorite would behave in this respect has been investigated by
Keppeler, who found that the Bullier and Maquenne material imparted more
chlorine to the gas which had traversed it than other hypochlorite
purifying agents, and that the partly foul material was liable to cause
violent explosions.
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