and useful discussions with J. F. Davidson are acknowledged. Nomenclature D = column diameter, m G = superficial gas mass velocity, kg/m2 sec g = gravitional acceleration, m/sec2 1 = length of tube section, m L = liquid volumetric flow rate, m3/sec A p / l = gas pressure gradient, N/m3 t = film thickness, m u = liquid velocity, m/sec UC, = superficial gas velocity, m/sec a = liquid fraction Ti = interfacial shear stress, N/m2
Literature CitedThe reaction of gaseous SO2 and NH3 in humid air at 23°C to form solid reaction products was studied experimentally in a flow-type reactor. With excess water vapor and oxygen, pure ammonium sulfate was formed in an initial concentration range of 4 to 60 mmol m-3. At equimolar ratios of NH3 and Son, ammonium sulfamate (3%) was also obtained. At water vapor concentrations approaching those of NH3 and SO2, the principal products were NH3.S02 and (NH3)2-S02 adducts with minor amounts of "$303, (NH4)2S207, NH4N3, and N3H7S04. At lower concentrations of 0 2 the reaction product was primarily (NH3)2-S02 with secondary products of N3H7S04 and NH3S03. The reaction rate was dependent on the amount of water vapor present but independent of the oxygen concentration. Rate constants were in the range 1-6 X l o 5 I. mol-' sec-'.
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