Patent ID: 6346651
Filing Date: 2002-02-12
Classification: B01J,C07C

Abstract:
A process for producing ketoisophorone comprising:a step for oxidizing &bgr;-isophorone in an inert solvent in the presence of an oxidizing catalyst to form ketoisophorone; a step for separating ketoisophorone and the solvent from the resultant reaction mixture; and a step of recycling at least the separated solvent to the oxidizing step; wherein the oxidizing catalyst is a complex salt of a transition metal and an N,Nâ€²-disalicylidenediamine, the solvent from which a low-boiling point component having a boiling point of 100 to 180Â° C. as a by-product has been removed is recycled to the oxidizing step, and the low-boiling point component is a component that poisons the oxidizing catalyst.