Distillation: processes – separatory – Plural distillations performed on same material – One a distillation under positive pressure or vacuum
Reexamination Certificate
2005-12-06
2005-12-06
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Plural distillations performed on same material
One a distillation under positive pressure or vacuum
C203S077000, C203S078000, C203S080000, C203S099000, C203SDIG019, C558S452000, C564S511000
Reexamination Certificate
active
06972075
ABSTRACT:
The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that has a hexamethylenediamine content of less than 1 wt. -%, b) removing completely or partially the 6-aminocapronitrile from mixture (I) while obtaining a mixture (II) whose content in substances that have a higher boiling point as 6-aminocapronitrile under distillation conditions and that cannot be formed by dimerization reactions when 6-aminocapronitrile is thermally treated is less than 1 wt. -%, and c) completely or partially removing from mixture (II) the hexamethylenediamine that might be present while obtaining a mixture (IV) whose hexamethylenediamine content is higher than that of mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of mixture (II).
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Achhammer Günther
Ansmann Andreas
Bassler Peter
Fischer Rolf-Hartmuth
Luyken Hermann
BASF - Aktiengesellschaft
Manoharan Virginia
Novak Druce & Quigg
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