Separation of 6-aminocapronitrile and hexamethylenediamine...

Details Separation of 6-aminocapronitrile and hexamethylenediamine... Separation of 6-aminocapronitrile and hexamethylenediamine...

2004-09-10

2008-12-23

Manoharan, Virginia (Department: 1797)

Distillation: processes, separatory

With measuring, testing or inspecting

C203S075000, C203S077000, C203S078000, C203S080000, C540S605000, C540S612000, C558S435000, C558S452000, C564S497000, C564S498000

Reexamination Certificate

active

07468119

ABSTRACT:
The invention relates to the field of separation by distillation of 6-aminocapronitrile (ACN) and hexamethylenediamine (HMD) from a mixture containing ACN, HMD, tetrahydrozaepine (THA), adiponitrile (ADN) and low boilers (LB). A method for producing a distillate stream comprising HMD is disclosed, which is suitable for the production of Nylon-6,6. The tails stream from the distillation of the mixture can be further distilled to produce a distillate containing ACN and THA, which is particularly suitable for use in the production of caprolactam and Nylon-6 from the caprolactam. Process conditions of the method of the invention disfavor the production of 2-cyanocyclopentylideneirnine (CPI).

REFERENCES:
patent: 6887352 (2005-05-01), Ostermaier
patent: 7208632 (2007-04-01), Ostermaier
patent: 2003/0023083 (2003-01-01), Luyken et al.
patent: 2004/0023083 (2004-02-01), Yang et al.

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