Co-production of an aromatic monoamine and an aromatic diamine d

Details Co-production of an aromatic monoamine and an aromatic diamine d Co-production of an aromatic monoamine and an aromatic diamine d

1985-11-01

1988-04-26

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C 8511

Patent

active

047406216

ABSTRACT:
A two-stage process for the co-production of aniline and m-phenylenediamine where, in the first stage, benzene, nitric acid, and sulfuric acid are reacted in a liquid phase to produce in greater amounts nitrobenzene (approximately 70%) and m-dinitrobenzene (approximately 30%), and in lesser or trace amounts o-dinitrobenzene and p-dinitrobenzene, and water; and in the second stage the products of the first stage are reacted with hydrogen in the gas phase to produce aniline (approximately 70%) and m-phenylenediamine (approximately 30%) in greater amounts, and o-phenylenediamine and p-phenylenediamine in lesser amounts, and water. The reaction products are separated by distillation. The first stage of a preferred embodiment of the process is characterized in that a concentrated mixture of nitric acid and sulfuric acid are fed along with mononitrobenzene to a first reactor for producing dinitrobenzene, and then the dilute acid mixture recovered from this first reactor is fed along with benzene to a second reactor for producing the mononitrobenzene used as a reactant in the first reactor. The second stage, which provides the aniline and m-phenylenediamine in major amounts, is characterized in that the hydrogenation is carried out in the gas phase with product aniline serving as a diluent. The process is applicable to the co-production of other aromatic mono- and diamines.

REFERENCES:
patent: 2454468 (1948-11-01), McArdle
patent: 4287365 (1981-09-01), Becker et al.
patent: 4340758 (1982-07-01), Lapporte et al.
patent: 4433169 (1984-02-01), Scholl

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