反应详情

温度

90 °C

0.0072 moles of salicylic acid and 0.029 moles acetic anhydride (molar ratio=1:4) were taken in a 20 ml reaction vessel of reaction station. Nano-crystalline sulfated zirconia catalyst (SZ-1), activated at 450° C. in static air with salicylic acid to catalyst weight ratio 10:1, was added and the mixture was heated at 90° C. for 240 minutes. The reaction mixture was filtered to separate the catalyst. The acetyl salicylic acid was crystallized from the reaction mixture. The crude yield of acetyl salicylic acid was 73%. It was further re-crystallized with ethanol-water to obtain pure crystals of acetyl salicylic acid.

1. additionwas added
2. filtrationThe reaction mixture was filtered
3. customto separate the catalyst
4. customThe acetyl salicylic acid was crystallized from the reaction mixture
5. customIt was further re-crystallized with ethanol-water