Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2005-01-18
2005-01-18
Davis, Brian (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C564S253000, C564S259000
Reexamination Certificate
active
06844469
ABSTRACT:
The invention relates to a process for the production of cyclohexanone oxime in which a phosphate-containing aqueous reaction medium is cycled from a hydroxylammonium synthesis zone to a cyclohexanone oxime synthesis zone and back to the hydroxylammonium synthesis zone, in which hydroxylammonium synthesis zone hydroxylammonium is formed by catalytic reduction of nitrate with hydrogen, and in which cyclohexanone oxime synthesis zone hydroxylammonium is reacted with cyclohexanone to form cyclohexanone oxime, where the concentration hydroxylammonium in the aqueous reaction medium entering the cyclohexanone oxime synthesis zone is higher than 1.0 mol/l.
REFERENCES:
patent: 3720758 (1973-03-01), Aggenbach et al.
patent: 3862230 (1975-01-01), Elmendorp et al.
patent: 3997607 (1976-12-01), De Rooij et al.
patent: 1 138 750 (1969-01-01), None
Benneker Arno
Oevering Henk
Pieters Paulus Johannes Jacobus
Pit Alex
Davis Brian
DSM Ip Assets B.V.
Mayer Brown Rowe & Maw LLP
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