Recycle process for the preparation and processing of a hydroxyl

Details Recycle process for the preparation and processing of a hydroxyl Recycle process for the preparation and processing of a hydroxyl

1975-01-17

1976-02-24

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

423387, C07C13104

Patent

active

039404420

ABSTRACT:
An improved recycle process for the production of cyclohexanone oxime comprising circulating an acidic, aqueous solution containing phosphoric acid or ammonium bisulphate or a mixture thereof between a hydroxylamine synthesis zone and a cyclohexanone oxime synthesis zone. Nitrate ions are added to the aqueous solution just prior to the hydroxylamine synthesis zone and catalytically reduced with molecular hydrogen. The aqueous solution from the hydroxylamine synthesis zone is then fed to the cyclohexanone oxime synthesis zone along with a ketone. The aqueous solution is then separated from the oxime formed, either (a) treated at an elevated temperature for a sufficient time to decompose any trace amounts of oxime and cyclohexanone or (b) subjected to a stripping step to remove any trace amounts of oxime and cyclohexanone before being recirculated to the hydroxylamine synthesis zone. The oxime formed by this process is a valuable commercial commodity.

REFERENCES:
patent: 3335183 (1967-08-01), de Rooij
patent: 3429920 (1969-02-01), de Rooij

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