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AssigneeCouncil of Scientific and Industrial Research
InventorsBoyapati Manoranjan Choudary, Mannepalli Lakshmi Kantam, Nadakuditi Sailendra Kumar, Kompella Vishweshwara Ram Prasad, Kondapuram Vijaya Raghavan
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This invention relates to a process for the nitration of xylene isomers by using zeolite-beta as a catalyst. This invention particularly relates to a process for the nitration of xylenes using solid acid catalyst, thus totally eliminating the disposal of spent acid and salts. Herein we describe the nitration of disubstituted benzenes, all the isomers of xylene, by employing nitric acid and beta zeolite catalyst dispensing the use of acetic anhydride. The reactions were performed at temperatures ranging from room temperature to reflux temperature of the solvent
An improved process for the nitration of isomers of xylene with high selectivity towards 4-nitro o and m-xylenes using a zeolite catalyst in batch mode which comprises nitrating the substrate with nitric acid in a molar ratio of xylene to nitric acid in the range of 1:0.80 to 1:1.5 in the presence of a zeolite-β catalyst at a reflux temperature of solvent for about 4 h and recovering the resulting nitro compounds by conventional methods
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