So2

U U 3 U 1, inhalation

Source: N.I. Sax, Dangerous properties of industrial materials, 2d ed. (New York: Rhinhold.)

To obtain efficient gas dispersion in large vessels requires concentric draft tubes and turbine-type blades, while a single draft tube (if any) and axial flow blades are used to efficiently blend waste and reagent for neutralization.

Figure 7.39.5 shows the alkali requirements for neutralizing various acids and the acid requirements for neutralizing various alkalis.

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