Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Reexamination Certificate
2007-10-16
2007-10-16
Richter, Johann (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
Reexamination Certificate
active
10852277
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: 4720566 (1988-01-01), Martin
patent: 6403850 (2002-06-01), Benage et al.
patent: 6608226 (2003-08-01), Reid et al.
Firth Bruce E.
Rosen Bruce I.
Ineos USA LLC
Richter Johann
Sackey Ebenezer
Yusko David P.
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