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Electro-membrane process for In situ Ion substitution and separation of salicylic acid from its sodium salt / Mahendra Kumar in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 923–930 Titre : Electro-membrane process for In situ Ion substitution and separation of salicylic acid from its sodium salt Type de document : texte imprimé Auteurs : Mahendra Kumar, Auteur ; Bijay P. Tripathi, Auteur ; Shahi, Vinod K., Auteur Année de publication : 2009 Article en page(s) : p 923–930 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Electro-Membrane  Process Résumé : An electrochemical membrane process (EMP) with three compartments (anolyte, catholyte, and central compartment) based on in-house-prepared cation-exchange membrane (CEM) was developed to achieve in situ ion substitution and recovery of salicylic acid (SAH) from its sodium salt. The physicochemical and electrochemical properties of the ion-exchange membrane (cation- and anion-exchange membrane) under standard operating conditions reveal its suitability for the proposed reactor. Experiments using sodium salicylate (SANa) solutions of different concentrations were carried out under varied applied current density to study the feasibility of the process. Overall electrochemical reaction for the in situ ion substitution and separation of SAH from SANa under operating conditions is also proposed. Results showed that developed EMP with CEMs proved promising for the in situ ion substitution and separation of SAH with recovery of SAH with current efficiency close to 90% and energy consumption around 10 kW h/kg of the SAH produced. This process was completely optimized in terms of operating conditions such as initial concentration of SANa in the central compartment, the applied current density, Na+ flux, recovery percentage, energy consumption, and current efficiency. Furthermore, the process efficiency and energy consumption of EMP for the production of SAH were compared with electrodialysis (ED) used for the separation of Na2SO4 and SAH, formed due to acidification of SANa by H2SO4. It was observed that EMP showed high current efficiency, recovery, and low energy consumption, in comparison with ED under similar experimental concentrations. It was concluded that the proposed EMP is an efficient alternate for producing SAH from SANa by economical and environmental friendly manner. Also the production of NaOH in the cathode stream is a spin off of the EMP. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801317n [article] Electro-membrane process for In situ Ion substitution and separation of salicylic acid from its sodium salt [texte imprimé] / Mahendra Kumar, Auteur ; Bijay P. Tripathi, Auteur ; Shahi, Vinod K., Auteur . - 2009 . - p 923–930. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 923–930 Mots-clés : Electro-Membrane  Process Résumé : An electrochemical membrane process (EMP) with three compartments (anolyte, catholyte, and central compartment) based on in-house-prepared cation-exchange membrane (CEM) was developed to achieve in situ ion substitution and recovery of salicylic acid (SAH) from its sodium salt. The physicochemical and electrochemical properties of the ion-exchange membrane (cation- and anion-exchange membrane) under standard operating conditions reveal its suitability for the proposed reactor. Experiments using sodium salicylate (SANa) solutions of different concentrations were carried out under varied applied current density to study the feasibility of the process. Overall electrochemical reaction for the in situ ion substitution and separation of SAH from SANa under operating conditions is also proposed. Results showed that developed EMP with CEMs proved promising for the in situ ion substitution and separation of SAH with recovery of SAH with current efficiency close to 90% and energy consumption around 10 kW h/kg of the SAH produced. This process was completely optimized in terms of operating conditions such as initial concentration of SANa in the central compartment, the applied current density, Na+ flux, recovery percentage, energy consumption, and current efficiency. Furthermore, the process efficiency and energy consumption of EMP for the production of SAH were compared with electrodialysis (ED) used for the separation of Na2SO4 and SAH, formed due to acidification of SANa by H2SO4. It was observed that EMP showed high current efficiency, recovery, and low energy consumption, in comparison with ED under similar experimental concentrations. It was concluded that the proposed EMP is an efficient alternate for producing SAH from SANa by economical and environmental friendly manner. Also the production of NaOH in the cathode stream is a spin off of the EMP. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801317n