The dust or froth of lime will be
removed in the washer where the acetylene bubbles through water--the dust
itself can be extracted by merely filtering the gas through cotton-wool,
felt, or the like. The least volatile liquid impurities will be removed
partly in the condenser, partly in the washer, and partly by the
mechanical dry-scrubbing action of the solid purifying material in the
chemical purifier. To some extent the more volatile liquid bodies will be
removed similarly; but a complete extraction of them demands the
employment of some special washing apparatus in which the crude acetylene
is compelled to bubble (in finely divided streams) through a layer of
some non-volatile oil, heavy mineral lubricating oil, &c.; for though
soluble in such oil, the liquid impurities are not soluble in, nor do
they mix with, water; and since they are held in the acetylene as
vapours, a simple passage through water, or through water-cooled pipes,
does not suffice for their recovery. It will be seen that a sufficient
removal of these generator impurities need throw no appreciable extra
labour upon the consumer of acetylene, for he can readily select a type
of generator in which their production is reduced to a minimum; while a
cotton-wool or coke filter for the gas, a water washer, which is always
useful in the plant if only employed as a non-return valve between the
generator and the holder, and the indispensable chemical purifiers, will
take out of the acetylene all the remaining generator impurities which
need, and can, be extracted.
Pages:
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323