Kinetics of absorption of sulfur dioxide and nitric oxide in aqueous mixed solutions of sodium chlorite and sodium hydroxide.

Sada, Eizô; Kumazawa, H.; Yamanaka, Yasuo; Kudo, Ichibei; Kondo, Takashi

doi:10.1252/jcej.11.276

Cited by 42 publications

(30 citation statements)

References 2 publications

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“…5, where the slope is found to be 1.5, and the reaction order is determined to be m = 2. A similar observation was reported for NaClO 2 /NaOH solutions by Brogren et al [16], Chu et al [17], and Sada et al [23,26]. The average rate constant is 5.76 · 10 7 (m 3 /mol) 2 /s in the case of C Na 2 CO 3 20 mol m -3 .…”

Section: Effect Of Gas-liquid Interfacial No Concentration On No Absosupporting

confidence: 84%

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Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Jiang

Cai

et al. 2008

Chem Eng & Technol

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The absorption rates of NO into aqueous solutions of NaClO 2 blended with Na 2 CO 3 were investigated in a stirred reactor. The experimental results showed that the reaction rate could be expressed as N NO 0:for a second-order reaction rate constant between NO and NaClO 2 , k mn = 5.79 · 10 15 exp(-5557.26/T), was obtained. The addition of Na 2 CO 3 into the solution of NaClO 2 decreased the reaction rate constant. The optimal absorption conditions involved a NO concentration of 540 ppm, NaClO 2 concentration of 50 mol m -3 , Na 2 CO 3 concentration of 10 mol m -3, temperature of 333 K and O 2 concentration of 4 %, which were determined by an orthogonal experiment. Under these optimal conditions, it was possible for the absorption rate to reach up to 1.9271 · 10 -5 mol/(s m 2 ).

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Section: Effect Of Gas-liquid Interfacial No Concentration On No Absosupporting

confidence: 84%

“…4 that the NO absorption rate increases with increasing NaClO 2 concentration. The absorption rate of NO by NaClO 2 is regarded as being the m-th order relative to NO [6,16,20,23,26], which was expressed by Danckwerts [27] as given by Eq. (8):…”

Section: Effect Of Naclo 2 Concentration On Nomentioning

confidence: 99%

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Jiang

Cai

et al. 2008

Chem Eng & Technol

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“…The diffusivity in an alkaline sodium chlorite solution can be calculated from the corresponding values of nitrous oxide [23] :…”

Section: Modeling the Absorptionmentioning

confidence: 99%

“…The diffusivity of N 2 O in the mixed salt solutions has been measured in a laminar liquid jet apparatus by Sada et al [23] .…”

Section: Modeling the Absorptionmentioning

confidence: 99%

Absorption of NO in an Aqueous Solution of NaClO2

Brogren¹,

Karlsson

Bjerle

1998

Chem. Eng. Technol.

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A packed column has been used to study the absorption of nitrogen oxide in an alkaline solution of sodium chlorite. The reactions taking place during the absorption have been examined and a lumped reaction model has been used to estimate rate constants from experimental data. Several parallel and consecutive reactions were found to take place during the absorption. NO was found to be oxidized to NO 2 and/or to NO 2 ± , and ClO 2 ± was reduced to Cl ± and/or to ClO ± . The pH value of the absorbing liquid was found to have a great impact both on the absorption rate and on the extent of the different redox reactions within the liquid. Experimental results indicate that sodium chlorite mainly works as an agent to oxidize NO to NO 2 and that the major part of the nitrogen oxides are absorbed via the hydrolysis of N 2 O 3 and N 2 O 4 .

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“…This is mainly because of the formation of ClO 2 from the decomposition of NaClO 2 solution in acidic condition [11]. Moreover, ClO 2 − has stronger oxidability in acid condition, hence, the removal efficiency of Hg 0 is raised effectively [12,13]. The oxidation-reduction potential of ClO 2 − / Cl − was lower than that of Hg 2+ /Hg 0 (0.85 V) under alkaline condition, which indicated that Hg 0 could not be oxidized by alkaline NaClO 2 solution, as shown in Figure 3.…”

Section: Figurementioning

confidence: 99%

Removal of Hg0 with sodium chlorite solution and mass transfer reaction kinetics

Zhao

Liu

Yao

et al. 2010

Sci. China Technol. Sci.

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The absorption behavior of Hg 0 was studied experimentally by using sodium chlorite solution (NaClO 2 ) as the absorbent in a bubble reactor. Primary influencing factors on removal efficiency of Hg 0 such as NaClO 2 concentration, pH, reaction temperature and the concentration of Hg 0 were investigated. The results indicated that 72.91% of Hg 0 removal efficiency could be achieved in acidic NaClO 2 solution. The removal mechanism of Hg 0 was proposed by analyzing of Hg 2+ concentration in absorption solution after reaction and comparing the electrode potentials between NaClO 2 species and Hg 2+ /Hg 0 . The experimental results of mass transfer-reaction kinetics on oxidation of Hg 0 by NaClO 2 solution showed that with the increase of NaClO 2 concentration and the decrease of pH value, the enhancement factor (E) and ratio of K G (Hg 0 )/k G (Hg 0 ) increased and the liquid phase mass transfer resistance decreased, which is benefit to the mass transfer adsorption reaction. Although the increase of reaction temperature could improve the enhancement factor (E), but the ratio of K G (Hg 0 )/k G (Hg 0 ) decreased; as a result, the liquid phase mass transfer resistance increased, therefore, the reaction rate for removal of Hg 0 decreased. NaClO 2 , elemental mercury, absorption, mass transfer reaction kinetics Citation:Zhao Y, Liu S T, Yao J. Removal of Hg 0 with sodium chlorite solution and mass transfer reaction kinetics.

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Kinetics of absorption of sulfur dioxide and nitric oxide in aqueous mixed solutions of sodium chlorite and sodium hydroxide.

Cited by 42 publications

References 2 publications

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Absorption of NO in an Aqueous Solution of NaClO2

Removal of Hg0 with sodium chlorite solution and mass transfer reaction kinetics

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Kinetics of absorption of sulfur dioxide and nitric oxide in aqueous mixed solutions of sodium chlorite and sodium hydroxide.

Cited by 42 publications

References 2 publications

Absorption of NO in Aqueous NaClO2/Na2CO3 Solutions

Absorption of NO in Aqueous NaClO2/Na2CO3 Solutions

Absorption of NO in an Aqueous Solution of NaClO2

Removal of Hg0 with sodium chlorite solution and mass transfer reaction kinetics

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Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions