where:

cross-section through which gas passes on its way through any one box in the series G = maximum amount of gas to be purified, scf/hr S =a correction factor for the hydrogen sulfide content of the inlet gas D = the total depth of the oxide, ft through which the gas passes consecutively in the purifier set. In boxes with split flow where half the gas passes through each layer, the area exposed to the gas is twice the cross-sectional area of the box, while D is the depth of one layer of oxide. C = the factor: 4 for 2 boxes, 8 for 3 boxes, and 10

for 4 boxes, respectively 3000 = a constant

From Equation 5.20(30), the following equation gives the maximum amount of gas which can be purified by a unit:

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