Process for producing N,N-diethylaminophenols

Details Process for producing N,N-diethylaminophenols Process for producing N,N-diethylaminophenols

1988-04-08

1990-10-30

Nutter, Nathan M.

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

Organic compounds

Amino nitrogen containing

564398, 564437, C01C20900

Patent

active

049670042

ABSTRACT:
A process for producing an N,N-diethylaminophenol is disclosed, comprising subjecting an aminophenol to reductive alkylation with acetaldehyde in the presence of a solvent, a catalyst, and hydrogen is disclosed, in which the reaction mixture from which the catalyst has been removed is subjected to distillation while maintaining the temperature of the bottom at 160.degree. C. or lower to substantially remove the unreacted acetaldehyde and the solvent, the residual bottom is distilled while maintaining the temperature of the bottom at 200.degree. C. or lower to recover a crude N,N-diethylaminophenol as a distillate, and the recovered crude N,N-diethylaminophenol is contacted with a solvent to which at least one of acid sulfites and dithionites has been added, said solvent being substantially incompatible with the N,N-diethylaminophenol, in an inert gas atmosphere, followed by precipitating and recovering the N,N-diethylaminophenol by cooling. N,N-Diethylaminophenols of high purity can be obtained in high yield without involving problems, such as production of large quantities of waste water and sludge, corrosion of materials, and coloring with time.

REFERENCES:
patent: 4760183 (1988-07-01), Papenfuhs et al.
Chemical Abstracts, vol. 107, No. 13, Sep. 28, 1987, CA 115 359u.
Chemical Abstracts, vol. 85, No. 7, Aug. 16, 1979, CA 46 172r.
European Search Report EP 88303116.3.

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