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US 2006/0217549 A1Published application
Diamine purification method
OwnerDidier Letourneur, Philippe Marioninventors
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Abstract
Process for the purification of diamines The present invention relates to a process for the purification of diamines obtained by hydrogenation of dinitriles. It relates more particularly to the purification of hexamethylenediamine obtained from the hydrogenation of adiponitrile. The process of the invention consists in treating a portion of the hexamethylenediamine stream withdrawn from the distillation column and in reinjecting this treated stream into the said column.
Claims18
1-10. (canceled)
A process for the purification of aliphatic diamines, comprising the step of
- a) carrying out an hydrogenation treatment on the diamine in a medium in the presence of a catalyst comprising platinum, palladium, ruthenium, rhodium, iridium, nickel or cobalt, and
- b) recovering of the purified diamine.
Dependencies are inferred from the claim text.