When a solid material having a proper degree of porosity or
aggregation is selected, the stream of gas passing through it is broken
up most thoroughly, and by employing several separate layers of such
material, every portion of the gas is exposed equally to the action of
the chemical reagent by the time the gas emerges from the vessel. The
amount of pressure so consumed is less than that in a liquid purifier
where much fluid is present; but, on the other hand, the loss of pressure
is absolutely constant at all times in a liquid purifier, provided the
head of liquid is maintained at the same point. A badly chosen solid
purifying agent may exhibit excessive pressure absorption as it becomes
partly spent. A solid purifier, moreover, has the advantage that it may
simultaneously act as a drier for the gas; a liquid purifier, in which
the fluid is mainly water, obviously cannot behave in a similar fashion
For thorough purification it is necessary that the gas shall actually
stream through the solid material; a mere passage over its surface is
neither efficient nor economical of material.
DISPOSITION OF PURIFYING MATERIAL.--Although much has been written, and
some exaggerated claims made, about the maximum, volume of acetylene a
certain variety of purifying material will treat, little has been said
about the method in which such a material should be employed to obtain
the best results.
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