Abstract: The present invention provides a green catalytic process for the synthesis of acetyl salicylic acid using solid acid catalysts at atmospheric pressure. The invention involve the solid acid catalyst such as sulfated transition metal oxides namely nano-crystalline sulfated zirconia, sulfated titania; modified zeolites namely zeolite H-beta, H-Y, H-ZSM-5 and K-10 montmorillonite clay in a solvent free environment using salicylic acid and acetic anhydride with yield about 95% and high selectivity (100%). The solid acid catalysts can be recovered, regenerated and reused.

Abstract: The present invention provides a green catalytic process for the synthesis of acetyl salicylic acid using solid acid catalysts at atmospheric pressure. The invention involve the solid acid catalyst such as sulfated transition metal oxides namely nano-crystalline sulfated zirconia, sulfated titania; modified zeolites namely zeolite H-beta, H—Y, H-ZSM-5 and K-10 montmorillonite clay in a solvent free environment using salicylic acid and acetic anhydride with yield about 95% and high selectivity (100%). The solid acid catalysts can be recovered, regenerated and reused.

Abstract: The present invention relates to a catalytic process for preparation of isolongifolene using nanocrystalline solid super acid. This process is an eco-friendly, single step, solvent free catalytic process for the preparation of a tricyclic sesqui-terpene hydrocarbon, isolongifolene. More particularly, the present invention provides a process for the catalytic isomerisation of longifolene to iso-longifolene using nano-crystalline sulfated zirconia as a solid super acid catalyst.

Abstract: An ecofriendly process for acylation of an alkylated benzene derivative has increased selectively towards para position and comprises a step of reacting the alkylated benzene derivative with an acylating agent in the presence of nitrobenzene, dichlorobenze, dimethylsulfolane, and/or benzotrile, and a crystalline alumino silicate catalyst having general formula M2/nO.Al2O3.xSiO2.wH2O, wherein M is an alkali cation, a rare earth cation, and/or a proton, wherein the Si/Al ratio is in the range of 5.5 to 20, wherein the step of reacting is performed at temperature between 80° to 140° C. for 5 to 25 hours. In a further step, the solid catalyst is separated from the reaction mixture of step, and in yet another step, the acylated alkyl benzene derivative is separated from the mixture.

Abstract: An ecofriendly process for acylation of an alkylated benzene derivative has increased selectivity towards para position and comprises a step of reacting the alkylated benzene derivative with an acylating agent in the presence of nitrobenzene, dichlorobenzene, dimethylsulfolane, and/or benzonitrile, and a crystalline alumino silicate catalyst having general formula M2/nO.Al2O3.x SiO2.wH2O, wherein M is an alkali cation, a rare earth cation, and/or a proton, wherein the Si/Al ration is in the range of 5.5 to 20, wherein the weight percentage of the alkali and/or lanthanide cation is between 10 to 30, and wherein the step of reacting is performed at temperature between 90° to 140° C. for 5 to 25 hours. In a further step, the solid catalyst is separated from the reaction mixture of step, and in yet another step, the acylated alkyl benzene derivative is separated from the mixture.

Abstract: The present invention relates to a catalytic process for preparation of isolongifolene using nanocrystalline solid super acid. This process is an eco-friendly, single step, solvent free catalytic process for the preparation of a tricyclic sesqui-terpene hydrocarbon, isolongifolene. More particularly, the present invention provides a process for the catalytic isomerisation of longifolene to iso-longifolene using nano-crystalline sulfated zirconia as a solid super acid catalyst.