Designing Wet Scrubbers for SO₂ Absorption into Fairly Concentrated Sulfuric Acid Solutions Containing Hydrogen Peroxide

Abstract

Absorption of SO 2 , diluted with nitrogen up to concentrations of 500 Pa, was performed at 20 C and 1 atm, with water and sulfuric acid solutions containing hydrogen peroxide in two different contactors: a packed column and a cable scrubber. The absorption rate was determined for various SO 2 partial pressures, as well as different concentrations of sulfuric acid (up to 40 wt %) and of hydrogen peroxide in the scrubbing liquid. It was found that the SO 2 absorption rate increases with the hydrogen peroxide concentration, and decreases as the acidity of the scrubbing liquid increases. Taking into account hydrodynamic and mass transfer characteristics of the packing for both scrubbers, a practical enhancement factor depending on the liquid phase H 2 SO 4 and H 2 O 2 contents, was deduced from semi-continuous tests. As a good concordance was observed between results determined for both contactors, a single correlation is proposed, allowing the computation of this kinetic factor for quite simple simulation or design of SO 2 scrubbers, provided the gas and liquid phase mass transfer coefficients k G a and k L a are known.

Removal of NOX from diesel engine exhaust by using different chemical absorbent in a lab-scale packed column system

“…Some ClO 2 may evolve from the solution into the gas phase and oxidize NO X to help the absorption of NO X in the system as shown in Equation (12) 4NO + 3NaClO 2 + 4NaOH ! 4NaNO 3 + 3NaCl ð12Þ…”

“…7 Considering the harmful emissions of engine exhaust, researchers derived various solutions like adding oxidation catalysts, anti-oxidation catalysts and so on. 8 NO X and other emission reduction techniques were proposed by various researchers, [9][10][11] and they proposed different devices such as packed column, 12 budding jet reactor, 13 combined packed and spray tower absorber, 14 wetted wall column, 15 cable bundle wet scrubber 16 and so on. For efficient removal of NO X , wet scrubbing method is practiced in a majority of industries.…”

Mechanistic Modeling of Pollutant Removal, Temperature, and Evaporation in Chemical Air Scrubbers

“…The working principle of this type of air scrubbers has already been extensively discussed in the literature by other authors 1–3. Applications comprise exhaust streams containing SO 2 and NO from combustion plants 4, 5, chlorine gas streams 6, or streams from agricultural applications containing mainly ammonia 7–10. Optimal reactive absorption can be achieved by correct process design, which is mainly dependent on proper packing selection and thorough understanding of the process behavior.…”

Colloidal Synthesis and Photocatalytic Performance of Size‐Controllable Solid or Hollow CuInSe2 Nanocrystals

“…The working principle of this type of air scrubbers has already been extensively discussed in the literature by other authors 1–3. Applications comprise exhaust streams containing SO 2 and NO from combustion plants 4, 5, chlorine gas streams 6, or streams from agricultural applications containing mainly ammonia 7–10. Optimal reactive absorption can be achieved by correct process design, which is mainly dependent on proper packing selection and thorough understanding of the process behavior.…”