Process for 1,4-phenylenediamine
AssigneeStandard Oil Company (Indiana)
InventorThomas A. Weil
Life of this patent
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Abstract
A process for the preparation of 1,4-phenylenediamine from 1,4-dihydroxybenzene at a temperature within the range of from about 300.degree. C. to 450.degree. C. and a pressure of from atmospheric to 3000 psig in the presence of an aminating agent, an inert hydrocarbon and an acidic alumina catalyst. p-Aminophenol can be aminated to 1,4-phenylenediamine with the same process.
Claims8
A process for the amination of a hydroxy aromatic selected from the group consisting essentially of 1,4-dihydroxybenzene and p-aminophenol which comprises reacting said hydroxy aromatic with an aminating agent in the presence of an inert liquid hydrocarbon with a boiling point in the range of from about 25.degree. C. to 400.degree. C., and an alumina catalyst selected from the group consisting of alpha alumina, gamma alumina and eta alumina catalysts at a temperature within the range of from about 300.degree. C. to 450.degree. C., a pressure from atmospheric to about 3000 psig wherein the concentration of said catalyst is within the range of from about 1:1 to about 1:10, weight of hydroxy aromatic to weight of catalyst and the mole ratio of aminating agent as ammonia to reactant is at least 20:1, aminating agent to reactant.
Dependencies are inferred from the claim text.