Process for the preparation of diphenylamine and derivatives thereof
AssigneeSnam Progetti S.p.A.
InventorsPietro Antonio Moggi, Ugo Romano
Life of this patent
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Abstract
Diphenylamine, or the alkyl, phenyl, amino, alkoxy, hydroxy or halogen derivative thereof, is prepared through a continuous process wherein a stream of the corresponding imine (e.g. N-cyclohexylidene aniline) in the vapor phase and oxygen are fed to a reactor maintained at a temperature in the range from 300.degree. to 450.degree. C, at a rate providing a contact time between the reactants in the range of 0.1 to 20 seconds.
Claims9
Process for the production of a member of the group consisting of diphenylamine and the alkyl, phenyl, amino, alkoxy, hydroxy and halogen derivatives thereof consisting in reacting an imine having the formula ##STR2## wherein R is a substituent selected from alkyl, H, phenyl, amine, alkoxy, hydroxy and halogen with oxygen at a temperature in the range from 300.degree. C. to 450.degree. C. by feeding to a reactor charged with a contact mass selected from silica, alumina, silica-alumina, silica-aluminate and oxides, oxide mixtures, and compounds of metals selected from the group consisting of V, Bi and Mo and maintained at said temperature a stream of said imine in the vapor phase, together with oxygen at a molar ratio in the range from 0.1:1 to 20:1 and at a rate providing a contact time in said reactor in the range from 0.1 to 20 seconds.
Dependencies are inferred from the claim text.