In one of his experiments Keppeler found that 13
per cent. of the chromic acid in heratol was wasted by reacting with
acetylene. As this waste of chromic acid involves also a corresponding
loss of gas, small purifiers are preferable, because at any moment they
only contain a small quantity of material capable of attacking the
acetylene itself. Frankoline is very efficacious as regards the
phosphorus, but it does not wholly extract the sulphur, leaving,
according to Keppeler, from 0.13 to 0.20 gramme of the latter in every
cubic metre of the gas. It does not attack acetylene itself; and if,
owing to its free hydrochloric acid, it adds any acid vapours to the
purified gas, these vapours may be easily removed by a subsequent passage
through a vessel containing lime or a carbide drier. Both being
essentially bleaching-powder, acagine and puratylene are alike in
removing phosphorus to a satisfactory degree; but they leave some sulphur
behind. Acagine evidently attacks acetylene to a slight extent, as
Keppeler has found 0.2 gramme of chlorine per cubic metre in the issuing
gas.
Although some of these materials attack acetylene slightly, and some
leave sulphur in the purified gas, they may be all considered reasonably
efficient from the practical point of view; for the loss of true
acetylene is too small to be noticeable, and the quantity of sulphur not
extracted too trifling to be harmful or inconvenient.
Pages:
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352