But
since they are not liquid, the casing of the purifier can be safely
constructed of steel or cast iron. Puratylene also removes ammonia by
virtue of the calcium chloride in it. Acagine would probably pass the
ammonia; but this is no real objection, as the latter can be extracted by
a preliminary washing in water. Heratol changes, somewhat obscurely, in
colour as it becomes spent, its original orange tint, due to the chromic
acid, altering to a dirty green, characteristic of the reduced salts of
chromium oxide. Frankoline has been asserted to be capable of
regeneration or revivification, _i.e._, that when spent it may be
rendered fit for further service by being exposed to the air for a time,
as is done with gas oxide; this, however, may be true to some extent with
the essential constituents of frankoline, but the process is not
available with the commercial solid product. Of all these materials,
heratol is the most complete purifier of acetylene, removing phosphorus
and sulphur most rapidly and thoroughly, and not appreciably diminishing
in speed or efficiency until its chromic acid is practically quite used
up. On the other hand, heratol does act upon pure acetylene to some
extent; so that purifiers containing it should be small in size and
frequently recharged.
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