Thiosulfate as an Oxidation Inhibitor in Flue Gas Desulfurization Processes: A Review of R&amp;D Results

Rochelle, Gary T.; Owens, David; Chang, J.C.S.; Bma, Theodore G.

doi:10.1080/00022470.1986.10466160

Cited by 11 publications

(13 citation statements)

References 10 publications

(15 reference statements)

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“…Sulfate concentrations did not rise higher than 5.0 g 1-l. These conditions were probably analogous to those found in an inhibited scrubber system, where thiosulfate inhibits sulfite oxidation by terminating free radical formation (Rochelle et al , 1986).…”

Section: Stabilization Of Slurry Aqueous Phase In 2-liter Fermentorsupporting

confidence: 62%

“…Thiosulfate is added to the sorbent slurry during sulfur dioxide capture to inhibit sulfite oxidation. It is thought that thiosulfate acts as a free radical scavenger (Rochelle et al,, 1986), producing tetrathionate, which then forms trithionate and thiosulfate. It is likely that all these species are present in the spent slurry.…”

Section: Selection Of Strains For Processing Inhibited Slurry Formentioning

confidence: 99%

“…Thiosulfate reacts with free radicals to form a variety of thiosalts. This strategy prevents gypsum scaling in the scrubbing system (Rochelle et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Microbial stabilization of sulfur-laden sorbents. Final technical report, September 1, 1993--August 31, 1994

Miller¹

1994

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Clean coal technologies that involve limestone for sulfur capture generate lime/limestone products laden with sulfur at various oxidation states. If sulfur is completely stabilized as sulfate, the spent sorbent is ready for commercial utilization as gypsum. However, the presence of reduced sulfur species requires additional processing. Thermal oxidation of reduced sulfur can result in undesirable release of S02-Microbial oxidation might provide an inexpensive and effective alternative. Sorbents laden with reduced forms of sulfur such as sulfide, sulfite, or various polytkiionate species serve as growth substrates for sulfur-oxidizing bacteria, which have the potential to convert all sulfur to sulfate.

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Section: Stabilization Of Slurry Aqueous Phase In 2-liter Fermentorsupporting

confidence: 62%

Section: Selection Of Strains For Processing Inhibited Slurry Formentioning

confidence: 99%

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Microbial stabilization of sulfur-laden sorbents. Final technical report, September 1, 1993--August 31, 1994

Miller¹

1994

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“…Both the amounts of excessive lactic acid and the consumption of calcium salt are determined by the amount of CaSO 4 produced. Currently, there are mature technologies to inhibit the oxidation of sulfite salts, such as CaSO 3 , Na 2 SO 3 and MgSO 3 [5,6,[19][20][21]. For example, an oxidation ratio between 4% and 10% is usually designed in the limestone inhibited oxidation process (LSIO) [1].…”

Section: Comparison Of Cal 2 Methods With Other Methodsmentioning

confidence: 99%

Reversible absorption of SO2 from simulated flue gas by aqueous calcium lactate solution

Tian

Hou

et al. 2015

Journal of the Taiwan Institute of Chemical Engineers

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“…These methods of sensitizing • OH cannot, therefore, be applied to determine the second-order rate constant for EBS reaction with • OH without a means to prevent EBS reaction with H 2 O 2 or OONO – . Although ascorbic acid, dehydroascorbic acid, thiosulfate, horseradish peroxidase, , and sodium pyruvate have been used to quench H 2 O 2 , some of these chemicals generate intermediate radicals that may react with EBS. , The reaction between sodium pyruvate and H 2 O 2 , however, yields nonradical products (see eq ) and was, therefore, used to deconvolute the reaction kinetics of EBS with H 2 O 2 and • OH. …”

Section: Resultsmentioning

confidence: 99%

Photochemistry of the Organoselenium Compound Ebselen: Direct Photolysis and Reaction with Active Intermediates of Conventional Reactive Species Sensitizers and Quenchers

Hopanna

Kelly

Blaney

2020

Environ. Sci. Technol.

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Ebselen (EBS), 2-phenyl-1,2-benzisoselenazol-3(2H)-one, is an organoselenium pharmaceutical with antioxidant and anti-inflammatory properties. Furthermore, EBS is an excellent scavenger of reactive oxygen species. This property complicates conventional protocols for sensitizing and quenching reactive species due to potential generation of active intermediates that quickly react with EBS. In this study, the photochemical reactivity of EBS was investigated in the presence of (1) 1 O 2 and • OH sensitizers (Rose Bengal (RB), perinaphthanone, H 2 O 2 ) and (2) reactive species scavenging and quenching agents (sorbic acid, isopropanol, sodium azide, tert-butanol) that are commonly employed to study photodegradation mechanisms and kinetics. The carbon analog of EBS, namely 2-phenyl-3H-isoindol-1-one, was included as a reference compound to confirm the impact of the selenium atom on EBS photochemical reactivity. EBS does not undergo acid dissociation, but pH-dependent kinetics were observed in RB-sensitized solutions, suggesting EBS reaction with active intermediates ( 3 RB 2-*, O 2 ⦁-, H 2 O 2 ) that are not kinetically-relevant for 38 other compounds. In addition, the observed rate constant of EBS increased in the presence of 39 sorbic acid, isopropanol, and sodium azide. These findings suggest that conventional reactive 40 species sensitizers, scavengers, and quenchers need to be carefully applied to highly reactive 41 organoselenium compounds to account for reactions that are typically slow for other organic 42 contaminants. 43

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Thiosulfate as an Oxidation Inhibitor in Flue Gas Desulfurization Processes: A Review of R&D Results

Cited by 11 publications

References 10 publications

Microbial stabilization of sulfur-laden sorbents. Final technical report, September 1, 1993--August 31, 1994

Microbial stabilization of sulfur-laden sorbents. Final technical report, September 1, 1993--August 31, 1994

Reversible absorption of SO2 from simulated flue gas by aqueous calcium lactate solution

Photochemistry of the Organoselenium Compound Ebselen: Direct Photolysis and Reaction with Active Intermediates of Conventional Reactive Species Sensitizers and Quenchers

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