| 摘要 |
PURPOSE:The reaction of a primary or secondary amine with formaldehyde is carried out under the pressure of hydrogen, then a primary or secondary amine is added to the reaction mixture and distillation is effected to obtain a tertiary amine which is readily purified with reduced discoloration and increased storage stability. CONSTITUTION:A primary or secondary amine and a hydrogenation catalyst are charged in a reactor, the mixture is stirred, as hydrogen is introduced into the reactor. When the hydrogen pressure and the temperature reach 3-20kg/cm<2> G and 100-150 deg.C, respectively, formaldehyde, preferably 35-50% formalin, is continuously fed in a certain time to effect the reactions. After the completion of the reactions, the catalyst is filtered off, the filtrate is combined with a primary or secondary amine and they are heat treated and subjected to distilla tion to collect the tertiary amine. The amine which is added to the tiltrate is selected so that it has an appropriate difference in boiling point from the tertiary amine. EFFECT:The acid components such as formic acid which are formed in the reactions are varied by addition of amines to give the objective substance of lowered discoloration with the passage of time.
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