Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Reexamination Certificate
2006-01-10
2006-01-10
Tsang, Cecilia (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
C558S466000
Reexamination Certificate
active
06984749
ABSTRACT:
Economical processes are disclosed for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gaseous. Processes of the invention include quenching the gaseous reactor effluent with an aqueous quench liquid; forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co-products; and using an integrated sequence of distillations and phase separations to recover for recycle of a useful aqueous liquid, and obtain the desired nitrogen-containing products. According to the invention aqueous solutions are fractionated in an integrated system of multi-stage columns while an effective polymerization inhibiting amount of at least one member of a preselected class of p-phenylenediamine compounds is maintained therein.
REFERENCES:
patent: 3691226 (1972-09-01), Halvorson et al.
patent: 4720566 (1988-01-01), Martin
patent: 5396004 (1995-03-01), Arhancet et al.
patent: 5396005 (1995-03-01), Arhancet
patent: 5416258 (1995-05-01), Arhancet et al.
patent: 5426257 (1995-06-01), Arhancet
patent: 5446220 (1995-08-01), Arhancet
patent: 5489718 (1996-02-01), Arhancet
patent: 5489720 (1996-02-01), Arhancet
patent: 5510547 (1996-04-01), Arhancet et al.
patent: 5648574 (1997-07-01), Arhancet et al.
patent: 5869730 (1999-02-01), Graham et al.
patent: 5895822 (1999-04-01), Monical et al.
patent: 6084121 (2000-07-01), Rogers et al.
patent: 6238574 (2001-05-01), Cesa et al.
patent: 6262323 (2001-07-01), Elder
patent: 6403850 (2002-06-01), Benage et al.
patent: 6627766 (2003-09-01), Reid et al.
Firth Bruce E.
Rosen Bruce I.
BP Corporation North America Inc.
Jerome Fred S.
Nemo Thomas E.
Sackey Ebenezer
Tsang Cecilia
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