PROCESS FOR PRODUCING MANGANESE DIOXIDE CATALYST FOR THE HYDRATION REACTION OF CYANOHYDRINS

摘要

A process for producing a denaturated manganese dioxide for the hydration reaction of cyanohydrins comprising reacting a permanganate salt and a manganese (II) compound in an acidic aqueous solution at a temperature of 60 DEG C to 150 DEG C is disclosed. The manganese dioxide catalyst obtained by the process exhibits a high activity over a long period in the preparation of an amide by the hydration of the corresponding cyanohydrin.