Synthesis of acetyl salicylic acid over WO₃/ZrO₂ solid superacid catalyst
2011
Zhang, Cun | Liu, Tao | Wang, Hong-Juan | Wang, Feng | Pan, Xiao-Yu
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.
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