Absorption of Dilute Nitrogen Monoxide by the Slurry Liquid of Fe(II)-edta-MgSO3 System:Effects of Coexisting Gases and of Liquid Components on NO Absorbability

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Experiments were conducted on the effects of coexisting SO2, O2 and CO2 and of liquid components on the duration of absorption efficiency of NO by the slurry liquid of Fe(II)-edta-MgSO3 system under the conditions:gas flow rate of one liter per minute, absorbing liquid of 200ml and temperature ranged from 30 to 70°C. Duration of high absorption efficiency of NO increased with the increases in the initial concentration of Fe(II)and MgSO3, but decreased with an increase in the concentra-tion of edta.Furthermore, the duration of high absorption efficiency decreased with the increases of the concentration of NO and O2, but was not so much influenced by the con-centration of SO2and CO2. An effective durable time of NO absorption was defined as the time θ85 when absorp-tion efficiency of NO was lowered to 85% of its initial value.Empirical equations on θ085 obtained were as follows: The maximum mole ratio of total NO absorbed, to MgSO3 was 0.82 for O2free system and was 0.40 for O2 contained system when the content of O2in the feed gas was 3.4%.
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