HIGH TEMPERATURE REMOVAL OF H{sub 2}S FROM COAL GASIFICATION PROCESS STREAMS USING AN ELECTROCHEMICAL MEMBRANE SYSTEM

Winnick, Jack; Liu, Meilin

doi:10.2172/823016

Cited by 1 publication

(3 citation statements)

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“…The reactions (1) and (2) have been discussed in the literature [2][3][4][5][7][8][9]12,[14][15][16] and catalyzed reaction (1) has also been studied [3,17]. Other possible reactions discussed in the literature [3,8] involving the two sulfur species in the hot coal gas streams at different temperatures include: Reactions (4) to (9) usually take place at temperatures above 1,000 o C. Reaction (10) may take place at low temperatures in the presence of MoS 2 catalyst [18].…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…Therefore, the most important reaction that determines the concentration of COS and H 2 S in the hot coal gas stream is reaction (1). Some thermodynamic data are available in the literature [2,[6][7][8]16]. The data cover a temperature range from room temperature to 1,200 o C. The reaction is slightly exothermic with the reaction heat of −2.58 kcal/mol and equilibrium constant of 0.53 at room temperature [2].…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…In the gasification coal gas stream, the COS content was usually found to be 10-15% of the H 2 S content and formation of COS from H 2 S is certainly taking place [5]. In the literature [2,[6][7][8][9], it has been generally agreed that reaction (1) is responsible for the formation of COS in the hot coal gas stream from H 2 S while the following reaction plays little role.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation of H2S and COS in the hot coal gas stream and its importance for high temperature desulfurization

Chang

Xie

et al. 2011

Korean J. Chem. Eng.

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Thermodynamic analysis of the correlation of H 2 S and COS has been carried out at the temperature range of 400-650 o C at which high temperature desulfurization of coal gas is usually performed. The correlation of the two sulfur species is mainly through the reaction H 2 S+CO→COS+H 2 . Simulated coal gas with the following composition CO 32.69%, H 2 39.58%, CO 2 18.27%, N 2 8.92% and H 2 S 0.47% was used in this study, and the equilibrium concentrations of the two species at different temperatures were calculated. The results of Fe-based sorbents during sulfidation were compared with calculations. It is concluded that the above reaction may reach equilibrium concentration in the presence of the Fe-based sorbents, which means the Fe-based sorbents may effectively catalyze the reaction between H 2 S and CO. Because of the correlation of the two sulfur species, both can be effectively removed at high temperatures simultaneously, offering high temperature desulfurization some advantages over low temperature desulfurization processes.

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