| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an N,N-dimethyl-N-alkylamine of a high purity in a high yield. SOLUTION: This method for producing the N,N-dimethyl-N-alkylamine is provided by heating a higher alcohol and dimethylamine (a) in the presence of a catalyst of copper-a 4th period transition metal element (except for Cr) which may contain the 8th group platinum group element, (b) under an atmospheric pressure or 9.8 MPa, (c) at 100-250 deg.C in a reaction system, (d) introducing dimethylamine and hydrogen into the reaction system and removing the produced water to the outside of the system, (e) setting the amount of dimethylamine in the exhausted gas discharged to the outside of the reaction system after removing the produced water as 0.5-50 vol.%, (based on the exhaust gas) (f) also stopping the introduction of dimethylamine gas into the reaction system at a time point that the molar ratio of the higher alcohol/N-methyl-N-alkyl or alkenylamine produced as byproducts becomes 1-1.5 and reacting while continuing the introduction of hydrogen. |
