Korea Kumho Petrochemical Co., Ltd.

Seoung-IL Kim

Sang Ho Park

Jin-Eok Kim

Han Jin Kwag

Provided is a method for preparing 4,4'-dinitrodiphenylamine (4,4&#x2032;-DNDPA) in high yield via the NASH reaction using a mixture of a bis-quaternary ammonium base and a base catalyst for the reaction of urea with nitrobenzene, and a method of preparing 4,4&#x2032;-bis(alkylamino)diphenylamine (4,4&#x2032;BAADA) in high yield and purity by hydrogenating the resulting 4,4&#x2032;-DNDPA with a ketone in the presence of hydrogen and hydrogenation catalyst. The catalyst complex used in the present invention allows easy recovery, provides superior alkaline stability and is capable of reducing production cost.

Method for preparation of 4,4'-dinitrodiphenylamine and 4,4&#x2032;-bis(alkylamino)diphenylamine with the base catalyst complex

Provided is a method of preparing 4,4'-dinitrodiphenylamine (4,4&#x2032;-DNDPA) in high yield by reacting 4-nitroaniline with excess nitrobenzene via the NASH reaction, and a method of preparing 4,4&#x2032;-bis(alkylamino)diphenylamine (4,4&#x2032;BAADA) in high yield and purity by hydrogenating the resulting 4,4&#x2032;-DNDPA with a ketone compound in the presence of hydrogen and hydrogenation catalyst. The disclosed process is simple, allows selective preparation of 4,4&#x2032;-DNDPA without byproducts, and thus allows preparation of 4,4&#x2032;-BAADA in high yield without a complicated purification procedure.

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Daejeon, South Korea

Seoung-IL Kim