Two-step process for liquid-phase production of oximes
AssigneeEnichem Anic S.p.A.
InventorsMaria A. Mantegazza, Guido Petrini, Alberto Cesana
Life of this patent
Estimating the term…
Abstract
Two-step process in the liquid phase for producing oximes at 60.degree.-100.degree. C. and 1.5-5 bars, which comprises: (a) in a primary step, ammoximating a carbonylic compound with H.sub.2 O.sub.2 and NH.sub.3 in the presence of a silicon, titanium and oxygen based catalyst; (b) oximating the residual carbonylic compound with a solution of hydroxylamine, obtained in its turn by oxidizing ammonia with H.sub.2 O.sub.2, having a concentration comprised within the range of from 0.01 to 3%, preferably of from 0.5 to 2% by weight, in such a way as to have a molar ratio of hydroxylamine to the carbonylic compound comprised within the range of from 0.9 to 3, preferably of from 1 to 2.
Claims7
Two-step process for producing oximes in the liquid phase, at 60.degree.-1000.degree. C. and 1.5-5 bars, which process comprises:
- (a) in a primary step, ammoximating a carbonylic compound with H.sub.2 O.sub.2 and NH.sub.3 in the presence of a silicon, titanium and oxygen based catalyst;
- (b) oximating the residual carbonylic compound with a solution of hydroxylamine, obtained in its turn by oxidizing ammonia with H.sub.2 O.sub.2, having a concentration comprised within the range of from 0.01 to 3%, preferably of from 0.5 to 2% by weight, in such a way as to have a molar ratio of hydroxylamine to the carbonylic compound comprised within the range of from 0.95 to 3, preferably of from 1 to 2.
Dependencies are inferred from the claim text.