Documents disponibles écrits par cet auteur

CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation / Wenlong Wang in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8333-8339 Titre : CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation Type de document : texte imprimé Auteurs : Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yanli Zheng, Auteur Année de publication : 2011 Article en page(s) : pp. 8333-8339 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  solution  Carbon  dioxide Résumé : In this work, the possibility of achieving fixation of CO2 using Ca and Mg ions was tested and verified Concentrated seawater from desalination plants, subsurface brines, industrial effluents with high hardness, and/or natural seawaters that are rich in Ca2+ and Mg2+ could all be potential aqueous sources. Theoretical analyses indicated that the carbonation reaction could be enhanced by raising the pH or the CO2 partial pressure. Experiments using synthesized seawater confirmed this possibility. Over 90% of the Ca2+ and Mg2+ ions in the seawater could be converted by precipitation in the forms of MgCO3 and dolomite [MgCa(CO3)2], and the kinetics of the process was found to be quite acceptable. It was found that 1 m3 of natural seawater could fix about 1.34 m3 or 2.65 kg of CO2 (gas volume, standard conditions), and the potential of concentrated seawater is 2-3 times this value. Even if the annual CO2 emissions of the entire world were captured in this way, the concentration of Ca2+/Mg2+ in natural seawater would change at only the part-per-million scale, such that the ecological effects could be negligible. This idea has great potential for application. It might be able to realize not only the permanent fixation of CO2 but also the production of large amounts of carbonate byproducts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332159 [article] CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation [texte imprimé] / Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yanli Zheng, Auteur . - 2011 . - pp. 8333-8339. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8333-8339 Mots-clés : Aqueous  solution  Carbon  dioxide Résumé : In this work, the possibility of achieving fixation of CO2 using Ca and Mg ions was tested and verified Concentrated seawater from desalination plants, subsurface brines, industrial effluents with high hardness, and/or natural seawaters that are rich in Ca2+ and Mg2+ could all be potential aqueous sources. Theoretical analyses indicated that the carbonation reaction could be enhanced by raising the pH or the CO2 partial pressure. Experiments using synthesized seawater confirmed this possibility. Over 90% of the Ca2+ and Mg2+ ions in the seawater could be converted by precipitation in the forms of MgCO3 and dolomite [MgCa(CO3)2], and the kinetics of the process was found to be quite acceptable. It was found that 1 m3 of natural seawater could fix about 1.34 m3 or 2.65 kg of CO2 (gas volume, standard conditions), and the potential of concentrated seawater is 2-3 times this value. Even if the annual CO2 emissions of the entire world were captured in this way, the concentration of Ca2+/Mg2+ in natural seawater would change at only the part-per-million scale, such that the ecological effects could be negligible. This idea has great potential for application. It might be able to realize not only the permanent fixation of CO2 but also the production of large amounts of carbonate byproducts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332159

Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization / Wenlong Wang in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1444–1449 Titre : Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization Type de document : texte imprimé Auteurs : Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yong Dong, Auteur Année de publication : 2010 Article en page(s) : pp. 1444–1449 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Study--Effect--CO2--Consumption--Desulfurizing--Ca(OH)2--Gas  Desulfurization Résumé : In view of the ambiguity concerning the effect of CO2 on the consumption of desulfurizing agent and based on our previous findings when studying flue gas desulfurization (FGD) byproduct, a specific study on the influence of CO2 has been carried out here with Ca(OH)2 being employed as a desulfurizing agent. This study is based on compositional analyses of the reaction products, and combined measurements have provided relatively precise compositions of the reaction products derived from Ca(OH)2 and flue gases. It has been found that the presence of CO2 does have an effect on the desulfurization reaction and on the consumption of desulfurizing agent when Ca(OH)2 is employed as the sorbent for SO2. Also, the formation of CaCO3 is inevitable at about 70 °C and is enhanced under conditions of high humidity. Although over 90% SO2 removal efficiency could be achieved with a relatively high Ca/S mole ratio, the effective utilization of desulfurizing agent would be low because CaCO3 is not the targeted product. Therefore, in order to improve semidry FGD technology, measures must be taken to prevent the reaction between CO2 and Ca(OH)2 so as to increase the utilization ratio of the desulfurizing agent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901401j [article] Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization [texte imprimé] / Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yong Dong, Auteur . - 2010 . - pp. 1444–1449. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1444–1449 Mots-clés : Study--Effect--CO2--Consumption--Desulfurizing--Ca(OH)2--Gas  Desulfurization Résumé : In view of the ambiguity concerning the effect of CO2 on the consumption of desulfurizing agent and based on our previous findings when studying flue gas desulfurization (FGD) byproduct, a specific study on the influence of CO2 has been carried out here with Ca(OH)2 being employed as a desulfurizing agent. This study is based on compositional analyses of the reaction products, and combined measurements have provided relatively precise compositions of the reaction products derived from Ca(OH)2 and flue gases. It has been found that the presence of CO2 does have an effect on the desulfurization reaction and on the consumption of desulfurizing agent when Ca(OH)2 is employed as the sorbent for SO2. Also, the formation of CaCO3 is inevitable at about 70 °C and is enhanced under conditions of high humidity. Although over 90% SO2 removal efficiency could be achieved with a relatively high Ca/S mole ratio, the effective utilization of desulfurizing agent would be low because CaCO3 is not the targeted product. Therefore, in order to improve semidry FGD technology, measures must be taken to prevent the reaction between CO2 and Ca(OH)2 so as to increase the utilization ratio of the desulfurizing agent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901401j