| 摘要 |
<p>An improved process for the manufacture of hexamethylene diamine by the hydrogenation of adiponitrile in the presence of an iron catalyst is disclosed. In the improved process the adiponitrile is treated with a solid acidic sorption agent so as to reduce the amount of N-heterocyclic amines in the adiponitrile prior to the hydrogenation of the adiponitrile in the presence of an iron catalyst. Examples of suitable solid acid sorption agents are weak-acid cation exchange resins in the hydrogen form, strong-acid cation exchange resins especially such resins having a macroreticular structure, molecular sieves, boron phosphate and bentonite. The process is particularly useful in the manufacture of hexamethylene diamine from adiponitrile obtained from adipic acid and ammonia. Hexamethylene diamine free of odoriferous compounds that otherwise may be produced on hydrogenation of adiponitrile with an iron catalyst is obtainable.</p> |
