| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for continuously producing polymethylene polyphenyl polyamine, capable of reducing N-methyl form content to the same extent as the case with batch system, and including methylene diphenyldiamine in amounts similar to the case with batch system. SOLUTION: The method for continuously producing polymethylene polyphenyl polyamine by reaction between aniline and formaldehyde in the presence of a hydrochloric acid catalyst is provided. Specifically, this method comprises (A) the first condensation step of reaction between 80-95 mass% of the total charged amount of the aniline and part of the total charge amount of the formaldehyde in the presence of the hydrochloric acid catalyst in the molar ratio of hydrochloric acid to aniline of≤0.99, (B) the second condensation step of mixing the resultant reaction liquid and the rest of the formaldehyde together to conduct a further reaction, and (C) the step of mixing the thus obtained reaction liquid and 5-20 mass% of the total charge amount of the aniline together to conduct an isomerization reaction. COPYRIGHT: (C)2007,JPO&INPIT |
