Process for the manufacture of hexamethylene diamine

Details Process for the manufacture of hexamethylene diamine Process for the manufacture of hexamethylene diamine

C - Chemistry, Metallurgy

07

C

260/607.8

C07C 209/48 (2006.01)

Patent

CA 1064523

ABSTRACT OF THE DISCLOSURE An improved process for the manufacture of hexa- methylene 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 use- ful in the manufacture of hexamethylene diamine from adipo- nitrile 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.

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