| 摘要 |
PROBLEM TO BE SOLVED: To effectively recover the hydrogenation activity of a Raney nickel catalyst to extend its life span by washing with an alcohol the Raney nickel catalyst whose activity has been decreased in the production of sugar alcohol by a hydrogenation reaction of reducing sugar. SOLUTION: A Raney catalyst whose activity has been reduced in the production of sugar alcohol by hydrogenation reaction of reducing sugar is regenerated by washing with an alcohol. The alcohol to be used is not specified so long as it does not dissolve a sticking organic compound generated by decomposing the reducing sugar. Preferably, a 1-4C lower alcohol is used. Since water is well dissolved in the lower alcohol, the catalyst wetted with water can be efficiently washed by the alcohol. A method for washing the catalyst by the alcohol includes a method that the catalyst is settled after the alcohol is added to the catalyst to remove the alcohol and that the alcohol is discharged continuously, and the like. |
