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US 4,062,893 AGranted
Process for preparing N,N-dialkyl aromatic amines
AssigneeNew Japan Chemical Co., Ltd.
InventorsTatsuo Kyuma, Mikio Nakazawa
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AssigneeNew Japan Chemical Co., Ltd.
InventorsTatsuo Kyuma, Mikio Nakazawa
Estimating the term…
A process is provided for preparing an N,N-dialkyl aromatic amine by reacting an aromatic amine of the formula ##STR1## wherein R is a hydrogen atom or a lower alkyl group with a lower alcohol in the presence of at least one catalyst selected from sulfuric acid and compounds being capable of forming sulfuric acid during the reaction. The essential features of this process are characterized by: 1. maintaining the reaction temperature at 170.degree. to 230.degree. C, 2. maintaining the reaction system at a pressure not higher than 10 Kg/cm.sup.2 gauge and capable of keeping the reaction phase liquid, and 3. feeding the amine and alcohol starting materials to the reaction system already containing at least one of the amine starting material and N,N-dialkyl aromatic amine, the desired product, and withdrawing the resulting reaction product and unreacted lower alcohol from the system in the form of a vapor while maintaining the above-mentioned pressure.
Process for preparing an N,N-dialkyl aromatic amine which comprises subjecting an aromatic amine of the formula ##STR4## wherein R is a hydrogen atom or a lower alkyl group, to reaction with a lower alcohol in the presence of at least one catalyst selected from the group consisting of (a) sulfuric acid and (b) compounds capable of forming sulfuric acid during the reaction process, in a suitable vessel, maintaining the reaction at a temperature of about 170.degree. to about 230.degree. C, maintaining the reaction pressure at a pressure not higher than about 10 kg/cm.sup.2 gauge which is capable of keeping the reaction phase liquid, and feeding the amine and alcohol starting materials to the reaction system in said vessel already containing at least one of the amine starting materials and N,N-dialkyl aromatic amine, the desired product, and withdrawing the resulting reaction product and unreacted lower alcohol from the system in the form of a vapor while maintaining the above-mentioned pressure.
Dependencies are inferred from the claim text.