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Synthesis of acetyl salicylic acid over WO3/ZrO2 solid superacid catalyst / Cun Zhang in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 236–241 Titre : Synthesis of acetyl salicylic acid over WO3/ZrO2 solid superacid catalyst Type de document : texte imprimé Auteurs : Cun Zhang, Auteur ; Tao Liu, Auteur ; Hong-Juan Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 236–241 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Acetyl  salicylic  acid  Solid  superacid  WO3/ZrO2  catalyst Résumé : Solid superacid WO3/ZrO2 was prepared by co-precipitation of an aqueous zirconyl chloride and ammonium metatungstate solution. The as-prepared catalysts were characterized by using XRD, Laser Raman spectroscopy and BET. Acetyl salicylic acid was synthesized from salicylic acid and acetic anhydride using as-synthesized WO3/ZrO2. The effects of WO3 concentration, reaction time, reaction temperature, molar ratio of reactants, as well as dosage of catalysts on synthesis of acetyl salicylic acid were investigated, and the reaction conditions were therefore optimized. The excellent yield (91.0%) of acetylsalicylic acid was obtained under optimized reaction conditions. The catalyst has been easily recovered and reused repeatedly with a consistent high yield. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010680 [article] Synthesis of acetyl salicylic acid over WO3/ZrO2 solid superacid catalyst [texte imprimé] / Cun Zhang, Auteur ; Tao Liu, Auteur ; Hong-Juan Wang, Auteur . - 2012 . - pp. 236–241. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 236–241 Mots-clés : Acetyl  salicylic  acid  Solid  superacid  WO3/ZrO2  catalyst Résumé : Solid superacid WO3/ZrO2 was prepared by co-precipitation of an aqueous zirconyl chloride and ammonium metatungstate solution. The as-prepared catalysts were characterized by using XRD, Laser Raman spectroscopy and BET. Acetyl salicylic acid was synthesized from salicylic acid and acetic anhydride using as-synthesized WO3/ZrO2. The effects of WO3 concentration, reaction time, reaction temperature, molar ratio of reactants, as well as dosage of catalysts on synthesis of acetyl salicylic acid were investigated, and the reaction conditions were therefore optimized. The excellent yield (91.0%) of acetylsalicylic acid was obtained under optimized reaction conditions. The catalyst has been easily recovered and reused repeatedly with a consistent high yield. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010680