Nitrogen Oxide Absorption into Water and Dilute Nitric Acid in an Engineering-Scale Sieve-Plate Column with Plates Designed for High Gas-Liquid Interfacial Area

摘要

The absorption of gaseous NO/sub x/ compounds into water and dilute HNO sub 3 was studied in a three-stage sieve-plate column with plates designed for high gas-liquid interfacial area. The performance of the column was measured while several operating parameters were varied. The results of the study indicate the importance of three mechanisms in the absorption of gaseous NO/sub x/ (NO sub 2 + 2N sub 2 O4 + NO) compounds: (1) the absorption of NO sub 2 /sup */ (NO sub 2 + 2N sub 2 O4) which results in production of liquid HNO sub 3 and HNO sub 2 ; (2) the dissociation of the liquid HNO sub 2 into HNO sub 3 and gaseous NO; and (3) the gas-phase oxidation of NO to NO sub 2 . A mathematical model based on these mechanisms was developed and is presented to explain the observed phenomena. (ERA citation 03:054682)