Distillation: processes – separatory – With measuring – testing or inspecting – Of temperature or pressure
Reexamination Certificate
2005-05-03
2005-05-03
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With measuring, testing or inspecting
Of temperature or pressure
C203S074000, C203S077000, C540S605000, C558S459000, C564S497000
Reexamination Certificate
active
06887352
ABSTRACT:
A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and adiponitrile (ADN) is disclosed.The method includes introducing the mixture into a first distillation column, separating as a group the HMD, ACN and at least a portion of the THA as distillate from the ADN. The first distillation column is operated at a temperature and pressure to minimize isomerization of the ADN into 2-cyanocyclopentylideneimine(CPI). The distillate of the first distillation column is introduced into a subsequent distillation column and the HMD is separated from the ACN and THA.
REFERENCES:
patent: 5961788 (1999-10-01), Ostermaier
patent: 6139693 (2000-10-01), Bassler et al.
patent: 6248926 (2001-06-01), Ostermaier et al.
patent: 6300497 (2001-10-01), Rehfinger et al.
patent: 6346641 (2002-02-01), Luyken et al.
patent: 6359178 (2002-03-01), Fischer et al.
patent: 6462220 (2002-10-01), Luyken et al.
patent: 6599398 (2003-07-01), Ostermaier et al.
Invista North America S.A.R.L.
Manoharan Virginia
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