Solvent free synthesis of acetyl salicylic acid over nano-crystalline sulfated zirconia solid acid catalyst

Acetyl salicylic acid, commonly known as Aspirin or Ecotrin, has been synthesized by an eco-friendly route using solid acid catalysts namely nano-crystalline sulfated zirconia, sulfated titania, zeolite H-beta, H-Y, H-ZSM-5 and acid treated K-10 clay. Among all the solid acid catalysts studied, nano-crystalline sulfated zirconia showed highest catalytic activity and was found to be efficient in minimal amount to obtain excellent yield (95 wt%) of acetyl salicylic acid crystals. Thermally regenerated catalyst showed similar yield as obtained with the fresh catalyst.

An eco-friendly, solvent free synthesis of acetyl salicyclic acid has been carried out over various solid acid catalysts. Among all the catalysts studied nano-crystalline sulfated zirconia (SZ) catalyst showed highest catalytic activity yielding 95 wt% of acetyl salicylic acid. Thermally regenerated catalyst showed similar yield as obtained with the fresh catalyst.Figure optionsDownload high-quality image (37 K)Download as PowerPoint slide