Počet záznamů: 1
Thermodynamics Possibilities and Constraints for the Regeneration of Spent Solid H2S Sorbents Based on Ce-, La-, and Zn-Oxides.
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SYSNO ASEP 0462391 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Thermodynamics Possibilities and Constraints for the Regeneration of Spent Solid H2S Sorbents Based on Ce-, La-, and Zn-Oxides. Tvůrce(i) Svoboda, Karel (UCHP-M) RID, ORCID, SAI
Leitner, J. (CZ)
Brynda, Jiří (UCHP-M) RID, ORCID, SAI
Skoblia, S. (CZ)
Chyou, Y.-P. (TW)
Chen, Y.-S. (TW)
Hartman, Miloslav (UCHP-M) RID, ORCID, SAIZdroj.dok. Proceedings. - Cape Town : University of Pittsburgh, 2016 - ISBN 1-890977-33-0 Rozsah stran s. 1-11 Poč.str. 11 s. Forma vydání Tištěná - P Akce Annual International Pittsburgh Coal Conference /33./ Datum konání 08.08.2016 - 12.08.2016 Místo konání Cape Town Země ZA - Jižní Afrika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. ZA - Jižní Afrika Klíč. slova sorbents ; regeneration ; temperature Vědní obor RIV CI - Průmyslová chemie a chemické inženýrství CEP GC14-09692J GA ČR - Grantová agentura ČR Institucionální podpora UCHP-M - RVO:67985858 Anotace The thermodynamic analyses are focused on suitable ways and conditions for regeneration of spent desulfurization sorbents from dry cleaning of producer gas in a temperature range 600 – 1200 K. Three sulfidic compounds (ZnS, Ce2O2S and La2O2S) were considered for regeneration to the corresponding oxides or oxy-carbonates by mild oxidation, reaction with SO2 and reaction with water vapour and CO2. Zinc sulfide can be regenerated practically only by mild oxidation either at O2/ZnS molar ration around 1.5 at temperatures between approx. 950 and 1050 K or at temperatures over 1200 K at higher O2/ZnS molar ratios. The temperature of regeneration higher than approx. 1100 K causes sintering/changes of sorbent texture. The Ce2O2S-based spent cerium sorbents are advantageously regenerated by reaction with SO2 at temperatures over 700 K (between 700 and 900 K). In this way CeO2, elemental sulfur and small concentrations of S2O are theoretically produced. If the spent Ce-sorbent contains also Ce-halides (e.g. CeCl3) , they are not decomposed by reaction with SO2. The La-based spent sulfur sorbents are restored by reaction with CO2 and H2O vapor leading to formation of La2O2CO3 and H2S. The suitable operating conditions involve temperatures between 700 and 800 K and higher operating pressures (above 1 MPa). The regeneration of La2O2S by simple oxygen oxidation is complicated by formation of very stable oxy-sulfate La2O2SO4. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2017
Počet záznamů: 1