Patent ID: 6555004
Filing Date: 2003-04-29
Classification: B01J

Abstract:
A method for separating an oxidation catalyst, a product of an oxidation reaction and a reaction solvent from a reaction mixture obtained by oxidizing a substrate in the presence of an oxidation catalyst which comprises an aromatic N-hydroxyimide compound and a transition metal, the method comprising the steps of:(i) distilling said reaction solvent from said reaction mixture in the presence of an organic solvent which is immiscible with said reaction solvent to obtain a residual reaction mixture which contains said reaction solvent in an amount of about 5 parts by weight or less per one part by weight of the N-hydroxyimide compound and precipitated oxidation catalyst, and (ii) separating said residual reaction mixture obtained in the step (i) by a solid liquid separation method to obtain the oxidation product and the oxidation catalyst.