| 摘要 |
An improved process for the production of polyvinyl alcohol by catalytic alcoholysis of its esters comprising charging an alcoholic polyvinyl ester solution of a relatively high viscosity into a confined space, disposing a layer of one or more alcohols having a lower specific gravity than said alcoholic ester solution on top of said alcoholic ester solution, disposing a layer of a liquid alcoholysis catalyst solution having a higher specific gravity than said one or more alcohols below said one or more alcohols layer, stirring said contents of said confined space whereby a suspension of alcoholic ester solution beads in said alcohols layer is formed, for a time sufficient to effect alcoholysis and recovering polyvinyl alcohol. |
