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262 Lawrence K. Wang et al.

Fig. 10. Pressure drop across a selected packing material—metric system. (Courtesy of
Lantec Products Inc.)

drop makes it impractical to operate a scrubber so packed at much over 500 fpm
because of increased power consumption as well as because of flooding concerns.)

As a result of the gas–liquid contacting, the efficiency of Q-PAC is better than that of
conventional random plastic packings, because in addition to providing a large surface
to spread the liquid, Q-PAC also forces the liquid to form droplets with greatly extended
surfaces that enhance mass transfer. Q-PAC also provides for substantially higher gas
handling capacity in a scrubber tower.

2. Chemical reactions involved in sulfur dioxide scrubbing (Fig. 1b). The inlet SO con-
2
centration was controlled in the range of 80–120 ppm at each flow rate. Both inlet and
outlet SO concentrations were measured simultaneously using an analyzer. The air
2
emission stream was scrubbed using a buffered solution of 2% sodium bicarbonate
and caustic. Over 99.9% of the SO was removed from the air emission stream. The
2
following chemical reactions occur in a packed tower scrubber:
SO + NaHCO → NaHSO + CO
2 3 3 2