There is but little to say about the design of the vessel
from the mechanical aspect. A circular horizontal section is more likely
to make for thorough exhaustion of the material. The grids should be
capable of being lifted out for cleaning. The lid may be made tight
either by a clamp and rubber or leather washer, or by a liquid seal. If
the purifying material is not hygroscopic, water, calcium chloride
solution, or dilute glycerin may be used for sealing purposes; but if the
material, or any part of it, does absorb water, the liquid in the seal
should be some non-aqueous fluid like lubricating oil. Clamped lids are
more suitable for small purifiers, sealed lids for large vessels. Care
must be taken that condensation products cannot collect in the purifying
vessel. If a separate drying material is employed in the same purifier
the space it takes must be considered separately from that needed by the
active chemical reagent. When emptying a foul purifier it should be
recollected that the material may be corrosive, and being saturated with
acetylene is likely to catch fire in presence of a light.
Purifiers charged with heratol are stated, however, to admit of a more
rapid flow of the gas through them than that stated above for puratylene.
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