Desulfurization characteristics of limestone slurry with added organic acid

Jeong, Ji Eun; Cho, In Ah; Lee, Chang-Yong

doi:10.1016/j.fuel.2022.126859

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Researchers have confirmed that, in FGD, the capacity to inhibit sulfite ion oxidation increases with increasing organic acid additive acidity [16].…”

Section: Graphical Abstractmentioning

confidence: 92%

“…In contrast, the slurry pH of the samples with organic acids displayed a gradual decrease from the start of absorption due to the organic acids being mixed in the limestone slurry before the absorption experiment. According to our previous research [16], in the absorption of SO 2 in limestone slurry, the more acidic the added organic acid, the more likely it is to inhibit the oxidation of SO 3…”

Section: Simultaneous Absorption Of So 2 and No 2 In Limestonementioning

confidence: 94%

“…Slurry with Added Ethanolamine shown in Eq. (16)(17), the reactions shown in Eq. (8-9) could increase.…”

Section: Simultaneous Absorption Of So 2 and No 2 In Limestonementioning

confidence: 99%

“…These results are attributed to the decrease in the reactions shown in Eq. (16)(17) due to the increased degradation of MEA and DEA in the slurry, which rapidly reacted with the CO 2(aq) generated from the reactions shown in Eq. ( 4) and (18).…”

Section: Simultaneous Absorption Of So 2 and No 2 In Limestonementioning

confidence: 99%

“…As shown in Fig.7C, the slurry pH of the samples, displayed an order of NS < TS < DS < MS within 50 min of absorption, subsequently exhibiting an order of TS < NS < DS ≈ MS afterwards. The reaction between SO 2 and ethanolamine was an acid-base reaction due to the basicity of ethanolamine, as shown in Eq (16)(17)(18) [29]…”

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confidence: 99%

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Effect of organic additives on NO2 removal in the simultaneous absorption of SO2 and NO2 into limestone slurry

Jeong,

Cho,

Lee

2023

Environmental Engineering Research

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When SO2 and NO2 are simultaneously absorbed into limestone slurry, the SO32- (including HSO3 -) ions formed by the hydrolysis of SO2 enhance the absorption rate of NO2. However, NO2 absorption decreases due to the oxidation of SO32- in the presence of O2. To address this issue, simultaneous absorption was performed by adding organic additives: formic, acetic, propionic acid, monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA). These limestone slurries were denoted FS, AS, PS, MS, DS, and TS, respectively. As the acidity of the organic acid increases, SO32- oxidation inhibition also increases. Accordingly, the denitrification rate of the slurries with added organic acid was in the order of PS < AS < FS. SO32- oxidation inhibition by the ethanolamine additives increased with the number of 2-hydroxyethyl. The denitrification rate within 50 min of reaction was in the order of MS < TS < DS, which is attributed to the basicity and SO32- oxidation inhibition by ethanolamine. The denitrification rate after 50 min of the reaction was in the order of MS < DS < TS, which is presumed to be the result of SO32- oxidation inhibition and degradation due to the CO2 absorption rate.

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“…Researchers have confirmed that, in FGD, the capacity to inhibit sulfite ion oxidation increases with increasing organic acid additive acidity [16].…”

Section: Graphical Abstractmentioning

confidence: 92%

Section: Simultaneous Absorption Of So 2 and No 2 In Limestonementioning

confidence: 94%

“…Slurry with Added Ethanolamine shown in Eq. (16)(17), the reactions shown in Eq. (8-9) could increase.…”

Section: Simultaneous Absorption Of So 2 and No 2 In Limestonementioning

confidence: 99%