PURIFYING MASS:
I ) Non Regenerative type:
The Non Regenerative purifying mass is based on Chromic acid.Both types (Regenerative & non-regenerative) give same Quality & Quantity of purification values.This material does not require regeneration, i.e saving Labour,time and some Quantity of Acetylene Gas.
But it is very much corrosive and harmful to pipelines & valves.It is also costlier by almost 50%.Hence large number of D.A Manufacturers are not using this type of material.
II) Regenerative type:
The ACETYLENE PURIFYING MASS(Regenerative type): A.P.M(r) is based on Ferric Chloride and other catalyst chemicals coated on activated expanded very light and porous silicous diatomaceous earth.
The A.P.M(r) is filled,without leaving gaps, in the holder trays with perforated bottoms in the purifying chambers.Presence of some moisture in the mass is essential.If it is bone dry some water may be sprinkled on the mass.Perfect purification requires, bringing Acetylene Gas into close contact of the Purifying Mass by sealing of gaps,cracks & leakages in the chambers.
The impurities are absorbed in the purifying mass with formation of double salts & metal complexes of aromitic character.