Absorption of nitrogen monoxide into aqueous potassium permanganate/sodium hydroxide and sodium sulfite/iron(II) sulfate solutions

Abstract

An experimental study on the absorption of low concentration nitrogen monoxide into aqueous KMnO,/NaOH and Na,SO,/FeSO, solutions has been conducted with two types of absorbers, a stirred tank and a bubble chamber. The absorption rates under various experimental conditions were measured. In the case of NO absorption into KMnO,/NaOH solutions, the rate is proportional to both the interfacial concentration of NO and either that of a complex formed in the solution or that of KMnO, depending on the pH values of the solutions. In the case of Na,SO,/FeSO, solutions, the rate shows the maximum at a certain concentration of Na2S03. The reaction mechanism involved seems not to be simple since the reaction orders with respect to Na,SO, and FeSO, are not integers. The experimental data have been analyzed by the (m ,n)th-order reaction model and equations for NO absorption rates have been presented.

Homolysis of the Peroxynitrite Anion Detected with Permanganate

“…In the reaction of ONOO - with MnO 4 - , both homolysis products, NO • and O 2 •- , are rapidly consumed by the detection reagent. The rate constant we obtained for the reaction of NO • with MnO 4 - , (3.5 ± 0.7) × 10 6 M -1 s -1 , is in excellent agreement with previously reported values of 3.93 × 10 6 , 1.18 × 10 6 , and 5.60 × 10 6 M -1 s -1 . For the reaction of O 2 •- with MnO 4 - , we determined a rate constant of (5.7 ± 0.9) × 10 5 M -1 s -1 at pH 11.7, which is lower than the earlier published value of (9.5 ± 0.8) × 10 5 M -1 s -1 at pH 9.4, but the discrepancy may be ascribed to the difference in pH.…”

The absorption kinetics of no from flue gas in a stirred tank reactor with KMnO4/NaOH solutions

“…This is consistent withSada et al. 's (1977) andUchida et al's (1983) results.Figure 8shows the measurements of NO absorption rate into a solution with 0.01 mol/L Downloaded by [University of Western Ontario] at 19:/L NaOH over a range of NO concentrations for various operating temperatures. The observed absorption rate decreases with the decreasing temperature from 50°C to 25°C Although the solubility of gases in liquid would increase as temperature decreases, however, the diffusivity of gases in liquid and reaction rate constants would decrease.…”

“…Although Uchida et al (1983) did the similar experiment with lower concentration of NO ranged from 399 to 1790 ppm, the study was still performed under 30 °C . They found that the reaction under low concentration of NO was first-order with respect to NO and first-order with respect to KMnO 4 , which was the same as the case with high NO concentration done by Sada et al (1977).…”

Absorption of NO in an alkaline solution of KMnO4

“…If the hydroxide concentration of the absorption solution is decreased, reaction (2) and the following reactions will take place in parallel [4]:…”

“…The absorption of NO in aqueous solutions of KMn04 and NaOH was investigated in the late 70's and early 80's by Teramoto et al [2], Sada et al [3] and Uchida et al [4]. The absorption experiments were performed in a semi-batchstirred vessel with a plane gas-liquid interface.…”