Process for nitrating toluene

Details Process for nitrating toluene Process for nitrating toluene

1977-07-15

1978-09-05

Sebastian, Leland A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260688, C07C 7910

Patent

active

041120060

ABSTRACT:
Toluene is nitrated with nitric acid in the gaseous phase under reduced pressure and at temperatures from about 80.degree. - 180.degree. C, while using an acidic inorganic catalyst consisting of a carrier substance based on SiO.sub.2 and/or Al.sub.2 O.sub.3 impregnated with a high boiling inorganic acid such as H.sub.2 SO.sub.4 or H.sub.3 PO.sub.4 and optionally with metal salts of such acids. This process yields essentially p-nitrotoluene, in addition to a smaller quantity of o-nitrotoluene and a very small amount of m-isomer. The technology of the process is simple and provides good yields. The nitrotoluenes, especially the p,nitrotoluene are interesting intermediates, for example for the manufacture of dyestuffs.

REFERENCES:
patent: 2431585 (1947-11-01), Rout
patent: 3957889 (1976-05-01), Milligan et al.
patent: 3965200 (1976-06-01), Manabe et al.
Topchiev, Nitration of Hydrocarbons and Other Organic Compounds, Pergamon Press, New York, 1959, pp. 278, 279 and 282.

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