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Production of sebacic acid using two-phase bipolar membrane electrodialysis / Fang Zhang in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7482–7488 Titre : Production of sebacic acid using two-phase bipolar membrane electrodialysis Type de document : texte imprimé Auteurs : Fang Zhang, Auteur ; Chuanhui Huang, Auteur ; Tongwen Xu, Auteur Année de publication : 2009 Article en page(s) : pp. 7482–7488 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sebacic  acid  Two-phase  bipolar  membrane  electrodialysis Résumé : To produce a water-insoluble acid—sebacic acid—in an environmentally friendly manner, two-phase bipolar membrane electrodialysis (TPBMED) was proposed to convert sodium sebacate into sebacic acid in ethanol−water mixtures. The results indicated that BP-C configuration (BP, bipolar membrane; C, cation-exchange membrane) was better than the other configurations: BP-A (A, anion-exchange membrane), BP-A-C, and BP-A-A. In a TPBMED stack of BP-C configuration, the sodium sebacate could be totally transformed to sebacic acid with a current efficiency of 94% and energy consumption of 2.2 kW h kg−1. The process cost was estimated to be $0.57 kg−1. Nonetheless, to simultaneously dissolve sebacic sodium and sebacic acid, the ethanol content in the mixture was controlled at 60 v/v %, and the maximal concentration of sebacic acid produced was only 0.13 mol dm−3 due to the limit on solubility. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900485k [article] Production of sebacic acid using two-phase bipolar membrane electrodialysis [texte imprimé] / Fang Zhang, Auteur ; Chuanhui Huang, Auteur ; Tongwen Xu, Auteur . - 2009 . - pp. 7482–7488. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7482–7488 Mots-clés : Sebacic  acid  Two-phase  bipolar  membrane  electrodialysis Résumé : To produce a water-insoluble acid—sebacic acid—in an environmentally friendly manner, two-phase bipolar membrane electrodialysis (TPBMED) was proposed to convert sodium sebacate into sebacic acid in ethanol−water mixtures. The results indicated that BP-C configuration (BP, bipolar membrane; C, cation-exchange membrane) was better than the other configurations: BP-A (A, anion-exchange membrane), BP-A-C, and BP-A-A. In a TPBMED stack of BP-C configuration, the sodium sebacate could be totally transformed to sebacic acid with a current efficiency of 94% and energy consumption of 2.2 kW h kg−1. The process cost was estimated to be $0.57 kg−1. Nonetheless, to simultaneously dissolve sebacic sodium and sebacic acid, the ethanol content in the mixture was controlled at 60 v/v %, and the maximal concentration of sebacic acid produced was only 0.13 mol dm−3 due to the limit on solubility. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900485k

Production of tetramethyl ammonium hydroxide using bipolar membrane electrodialysis / Haozhe Feng in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7552-7557 Titre : Production of tetramethyl ammonium hydroxide using bipolar membrane electrodialysis Type de document : texte imprimé Auteurs : Haozhe Feng, Editeur scientifique ; Chuanhui Huang, Editeur scientifique ; Tongwen Xu, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7552-7557 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Tetramethyl  ammonium  hydroxide  (TMAH)  Bipolar  membrane  electrodialysis  (BMED) Résumé : To produce tetramethyl ammonium hydroxide (TMAH) at lower energy consumption and with less environmental pollution, a bipolar membrane electrodialysis (BMED) of A-BP configuration (A, anion exchange membrane; BP, bipolar membrane) was adopted to electro-alkalize tetramethyl ammonium chloride. The results for one-unit BMED stack indicate that current efficiency increases and energy consumption decreases as feed concentration increases or current density decreases. The highest current efficiency can reach 99.9%, and the lowest energy consumption is 1.43 kWh kg−1. On the basis of a 3-unit BMED, the process cost is estimated to be 0.33 $ kg−1 of TMAH. This method is not only environmentally friendly but also cost-effective. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800558m [article] Production of tetramethyl ammonium hydroxide using bipolar membrane electrodialysis [texte imprimé] / Haozhe Feng, Editeur scientifique ; Chuanhui Huang, Editeur scientifique ; Tongwen Xu, Editeur scientifique . - 2008 . - P. 7552-7557. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7552-7557 Mots-clés : Tetramethyl  ammonium  hydroxide  (TMAH)  Bipolar  membrane  electrodialysis  (BMED) Résumé : To produce tetramethyl ammonium hydroxide (TMAH) at lower energy consumption and with less environmental pollution, a bipolar membrane electrodialysis (BMED) of A-BP configuration (A, anion exchange membrane; BP, bipolar membrane) was adopted to electro-alkalize tetramethyl ammonium chloride. The results for one-unit BMED stack indicate that current efficiency increases and energy consumption decreases as feed concentration increases or current density decreases. The highest current efficiency can reach 99.9%, and the lowest energy consumption is 1.43 kWh kg−1. On the basis of a 3-unit BMED, the process cost is estimated to be 0.33 $ kg−1 of TMAH. This method is not only environmentally friendly but also cost-effective. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800558m

Win-win coupling in electrodialysis with bipolar membranes (EDBM) for cleaner production / Chuanhui Huang in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1699–1705 Titre : Win-win coupling in electrodialysis with bipolar membranes (EDBM) for cleaner production Type de document : texte imprimé Auteurs : Chuanhui Huang, Auteur ; Tongwen Xu, Auteur ; Haozhe Feng, Auteur Année de publication : 2009 Article en page(s) : pp. 1699–1705 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Electrodialysis  Bipolor  membranes  Piperazine  sulfate  Sodium  gluconate Résumé : An obstacle to the development of electrodialysis with bipolor membranes (EDBM) technology—high fixed cost—can be cleared away by allocating the investment among factories or plants, but it requires that EDBM couple two processes inside and provide respective products cost-effectively. To assess the process coupling, piperazine sulfate (PzH2SO4) and sodium gluconate (NaGlu) were used as model agents for Pz regeneration and HGlu production, respectively. The results showed that the highest current efficiency was achieved at the highest current density, and the lowest energy consumption at the highest feed concentration. The process cost was estimated to be $0.80 kg−1 Pz and $0.17 kg−1 HGlu in the coupled operation, which were less than those in separate operations—$0.96 kg−1 Pz and $0.24 kg−1 HGlu. Apart from environmental benignity, the process coupling in EDBM can achieve a win−win economy due to allocation of investment and economies of scale. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801192k [article] Win-win coupling in electrodialysis with bipolar membranes (EDBM) for cleaner production [texte imprimé] / Chuanhui Huang, Auteur ; Tongwen Xu, Auteur ; Haozhe Feng, Auteur . - 2009 . - pp. 1699–1705. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1699–1705 Mots-clés : Electrodialysis  Bipolor  membranes  Piperazine  sulfate  Sodium  gluconate Résumé : An obstacle to the development of electrodialysis with bipolor membranes (EDBM) technology—high fixed cost—can be cleared away by allocating the investment among factories or plants, but it requires that EDBM couple two processes inside and provide respective products cost-effectively. To assess the process coupling, piperazine sulfate (PzH2SO4) and sodium gluconate (NaGlu) were used as model agents for Pz regeneration and HGlu production, respectively. The results showed that the highest current efficiency was achieved at the highest current density, and the lowest energy consumption at the highest feed concentration. The process cost was estimated to be $0.80 kg−1 Pz and $0.17 kg−1 HGlu in the coupled operation, which were less than those in separate operations—$0.96 kg−1 Pz and $0.24 kg−1 HGlu. Apart from environmental benignity, the process coupling in EDBM can achieve a win−win economy due to allocation of investment and economies of scale. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801192k