METHOD FOR PREPARING N-METHYLANILINE Russian patent published in 2006 - IPC C07C209/36 C07C211/48 

FIELD: organic chemistry, petroleum chemical synthesis and chemical technology.

SUBSTANCE: invention relates to the improved method for preparing N-methylaniline by reductive N-alkylation reaction of aniline with methanol. Proposed method is carried out at enhanced temperature but usually at temperature 180-280°C on copper-containing catalysts comprising copper in the concentration 9-60 wt.-% as measured for copper oxide and involving reduction of catalyst at temperature 180-200°C and the following isolation of the end product from catalyzate by rectification. The stage of N-alkylation reaction of aniline and reduction of catalyst are carried out in the presence of exhausting gases of this process with the volume rate of raw feeding 0.3-0.7 h^-1 and in the mole ratio aniline/exhausting gases = 1:(1-10). Method provides high conversion and yield of the end N-methylaniline, simplifying the technological process and to diminish the cost of the process significantly.

EFFECT: improved preparing method.

2 cl, 7 ex