Documents disponibles écrits par cet auteur

Fractionation of ligusticum chuanxiong by adsorption in supercritical carbon dioxide / Zhihui Hu in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14496-14502 Titre : Fractionation of ligusticum chuanxiong by adsorption in supercritical carbon dioxide Type de document : texte imprimé Auteurs : Zhihui Hu, Auteur ; Donghui Zhang, Auteur ; Jixiao Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 14496-14502 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Supercritical  state  Carbon  dioxide  Adsorption  Speciation Résumé : An experimental and simulated study of the fractionation of Ligusticum chuanxiong via adsorption in supercritical carbon dioxide (SC-CO2), using silica gel as the adsorbent, was conducted. Adsorption equilibrium and adsorption dynamic data were obtained from experiments conducted at 8.8 MPa and 323.15 K The adsorption isotherms can be represented by the Extended Langmuir 1 isotherm equation. Effect of the flow rate of the strippant was studied, and the regeneration became more complete and occurred more quickly as the flow rate of the strippant increased. Highly concentrated fraction of lactone was obtained for the desorption step and the recovery of it reached 85%. A mathematical model simulated the behavior of the process well, and the amount of adsorbed components on the adsorbents was predicted graphically. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620363 [article] Fractionation of ligusticum chuanxiong by adsorption in supercritical carbon dioxide [texte imprimé] / Zhihui Hu, Auteur ; Donghui Zhang, Auteur ; Jixiao Wang, Auteur . - 2013 . - pp. 14496-14502. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14496-14502 Mots-clés : Supercritical  state  Carbon  dioxide  Adsorption  Speciation Résumé : An experimental and simulated study of the fractionation of Ligusticum chuanxiong via adsorption in supercritical carbon dioxide (SC-CO2), using silica gel as the adsorbent, was conducted. Adsorption equilibrium and adsorption dynamic data were obtained from experiments conducted at 8.8 MPa and 323.15 K The adsorption isotherms can be represented by the Extended Langmuir 1 isotherm equation. Effect of the flow rate of the strippant was studied, and the regeneration became more complete and occurred more quickly as the flow rate of the strippant increased. Highly concentrated fraction of lactone was obtained for the desorption step and the recovery of it reached 85%. A mathematical model simulated the behavior of the process well, and the amount of adsorbed components on the adsorbents was predicted graphically. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620363

Parametric study of the membrane process for carbon dioxide removal from natural gas / Dongxiao Yang in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9013–9022 Titre : Parametric study of the membrane process for carbon dioxide removal from natural gas Type de document : texte imprimé Auteurs : Dongxiao Yang, Auteur ; Zhi Wang, Auteur ; Jixiao Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 9013–9022 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cross-flow  model  Removing  CO2Natural  gas Résumé : In this work, the cross-flow model is compared with the cocurrent flow model and the countercurrent flow model for the process of removing CO2 from natural gas. According to the comparison result, the cross-flow model is used for the analysis of the process of CO2 removal from the natural gas. Analysis results indicate that the membrane area is not a monodrome function of the selectivity and both the effects of the fast gas (CO2) permeability and the slow gas (CH4) permeability on membrane area and CH4 recovery are studied. Similar analysis is carried out for the operating pressures. Both the single stage system and the two-stage system with a recycle are studied. In order to reduce the membrane area required, membranes with high permeability and selectivity less than 100 are preferable. With increasing feed side pressure and decreasing permeate side pressure, the membrane area required decreases and the CH4 recovery increases. For the single-stage system using a commercial membrane with selectivity of 20, the CH4 recovery is lower than 90% at a product purity of 98%. Only when the membrane with selectivity higher than 50 is used, the separation of CH4 recovery >98% and product purity >98% target can be fulfilled by the single stage system. Using the two-stage system with a membrane selectivity of 20, the separation target can be achieved. In the two-stage system, the permeate gas of the first stage has to be compressed before it can be sent to the next stage. The compression energy required between stages is estimated to be 107.5 KJ/m3(STP) of feed for the process discussed in this paper. Even considering the conversion factor between heat and electricity of 3−4, the energy consumption of a two-stage membrane system is still much less than that of the amine absorption process which is about 600−900 KJ/(m3(STP) of feed). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900028m [article] Parametric study of the membrane process for carbon dioxide removal from natural gas [texte imprimé] / Dongxiao Yang, Auteur ; Zhi Wang, Auteur ; Jixiao Wang, Auteur . - 2009 . - pp. 9013–9022. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9013–9022 Mots-clés : Cross-flow  model  Removing  CO2Natural  gas Résumé : In this work, the cross-flow model is compared with the cocurrent flow model and the countercurrent flow model for the process of removing CO2 from natural gas. According to the comparison result, the cross-flow model is used for the analysis of the process of CO2 removal from the natural gas. Analysis results indicate that the membrane area is not a monodrome function of the selectivity and both the effects of the fast gas (CO2) permeability and the slow gas (CH4) permeability on membrane area and CH4 recovery are studied. Similar analysis is carried out for the operating pressures. Both the single stage system and the two-stage system with a recycle are studied. In order to reduce the membrane area required, membranes with high permeability and selectivity less than 100 are preferable. With increasing feed side pressure and decreasing permeate side pressure, the membrane area required decreases and the CH4 recovery increases. For the single-stage system using a commercial membrane with selectivity of 20, the CH4 recovery is lower than 90% at a product purity of 98%. Only when the membrane with selectivity higher than 50 is used, the separation of CH4 recovery >98% and product purity >98% target can be fulfilled by the single stage system. Using the two-stage system with a membrane selectivity of 20, the separation target can be achieved. In the two-stage system, the permeate gas of the first stage has to be compressed before it can be sent to the next stage. The compression energy required between stages is estimated to be 107.5 KJ/m3(STP) of feed for the process discussed in this paper. Even considering the conversion factor between heat and electricity of 3−4, the energy consumption of a two-stage membrane system is still much less than that of the amine absorption process which is about 600−900 KJ/(m3(STP) of feed). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900028m