Solubility of sulfur dioxide at low partial pressures in dilute sulfuric acid solutions

Govindarao, V. M. H.; Gopalakrishna, K. V.

doi:10.1021/ie00021a037

Cited by 15 publications

(24 citation statements)

References 13 publications

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“…When the external and internal mass transfer effects become insignificant (as is found in the present work), writing the mass balance for SO2 in the reactor, and combining with eq 8 for the kinetics of the reaction and with the following solubility equation (eq 10 of Govindarao and Gopalakrishna (1993); rewritten in the present notation), …”

Section: ~C S O (~~) ]mentioning

confidence: 80%

“…As the concentration of the product S(VI) in the liquid phase increases, the solubility of SO2 decreases (Hartman and Coughlin, 1972;Govindarao and Gopalakrishna, 1993), and therefore the concentration of S(IV) decreases. The steady value is due to the following reasons.…”

Section: Resultsmentioning

confidence: 99%

“…Govindarao and Gopalakrishna (1993) have shown that, at concentrations of sulfuric acid above 0.37 kmol m-3, sulfur dioxide exists in the solution mainly in the molecular form, SOz(aq); HS03-is negligible. This not only ensures the reliability of the experiments but shows that adsorption of the species SOz(aq), HS03-, so42-, and/or H2SO4 on the catalyst particles is not strong.…”

Section: Preliminary Experimentsmentioning

confidence: 99%

“…The gas phase concentration is estimated as described in Govindarao and Gopalakrishna (1993) and the liquid phase concentrations are estimated as discussed above. The progress of the reaction is monitored by estimating, at regular intervals of about 10 min, the concentration of SO2 in the exit gas and simultaneously the concentrations of total S(IV) and total S(VI) in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Govindarao¹,

Gopalakrishna²

1995

Ind. Eng. Chem. Res.

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Sulfur dioxide in aqueous solutions a t low pH levels exists both in molecular SOz(aq) and in hydrolyzed ionic form HSOa-. Experiments indicate that only HS03is the reacting species in the oxidation catalyzed by activated carbon, while SOz(aq) deactivates by competing with HS03for the active sites of the catalyst particles. A mechanism is proposed and a rate model is developed that also accounts for the effect of sulfuric acid (product of the oxidation) on the solubility of sulfur dioxide. It predicts first order in HS03-, half order in dissolved oxygen, and a linear deactivation effect of SOz(aq), which are confirmed by experimental data. The deactivation reaches a constant level corresponding to saturation of the active sites by SOAaq). Activation energy for the oxidation is 93.55 kJ mol-l and for deactivation is 21.4 kJ mol-l.

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Section: ~C S O (~~) ]mentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Preliminary Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Govindarao¹,

Gopalakrishna²

1995

Ind. Eng. Chem. Res.

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“…A considerable amount of research has been conducted on the solubility of SO 2 in sulphuric acid solutions and the following reviews should be studied for further information: references [31], [45], and [46]. Govindarao and Gopalakrishna [31] give a thermodynamically derived equation for the solubility of SO 2 in dilute H 2 SO 4 . Zhang et al [47] extended this model to include concentrated solutions and showed that at concentrations greater than 22 wt per cent, the model could be simplified to Henry's law, due to the lack of hydrolysis of SO 2…”

Section: Appendixmentioning

confidence: 99%

Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

McGlashan

Marquis

2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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Abstract:The current paper presents a new process for postcombustion carbon capture. An historical survey of the cryogenic techniques used in the chemical industry for the removal of acid vapours is given, with particular emphasis on two Ryan -Holmes-based processes. The paper suggests that these two processes have the potential to achieve CO 2 separation from flue gas with high second law efficiency. A further variation on these processes is then proposed enabling the simultaneous capture of CO 2 , SO 2 , and NO x from flue gas produced in conventional or combined cycle power stations, burning pulverized coal or heavy bunker fuels. The proposed process absorbs these vapours by dehumidification using a cooled liquid absorbent, at low pressure (close to atmospheric) and cryogenic temperatures. A feature of the process is the use of direct contact heat transfer to perform the major cooling and heating operations thus reducing the plant size and cost while improving efficiency.The paper starts with a discussion of the most suitable absorbent for the process; liquid SO 2 is suggested and a simplified analysis of an absorption column is conducted using the technique developed by Souders and Brown. This analysis shows that with only four theoretical stages and an acceptable liquid/gas ratio of two, SO 2 is able to absorb CO 2 and leave a residual concentration of CO 2 in the flue gas equivalent to 90 per cent carbon capture.The final section of the paper describes the use of dilute H 2 SO 4 as a precooling stream to reduce the temperature of the flue gas prior to it entering the CO 2 scrubbing section. It is proposed to produce the necessary H 2 SO 4 from the constituents of the flue gas using similar reactions to those of the 'lead-chamber process'. The H 2 SO 4 stream is also used to reheat the flue gas before it is passed to the chimney. It is shown that an important attribute of the H 2 SO 4 stream is its role as a 'lean-oil', reducing SO 2 emissions from the power station to well below the levels required by future legislation.

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

Thomas¹,

Colle

Vanderschuren

2003

Chem Eng & Technol

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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.

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Solubility of sulfur dioxide at low partial pressures in dilute sulfuric acid solutions

Cited by 15 publications

References 13 publications

Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

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

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Solubility of sulfur dioxide at low partial pressures in dilute sulfuric acid solutions

Cited by 15 publications

References 13 publications

Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Oxidation of Sulfur Dioxide in Aqueous Suspensions of Activated Carbon

Simultaneous removal of CO2, SO2, and NOx from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

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

Contact Info

Product

Resources

About

Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

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