| abstract |
PROBLEM TO BE SOLVED: To remarkably reduce hydrogenation pressure and remarkably low acid concentration in a first-stage reaction mixture, thereby enabling hydrogenation using a copper catalyst without removing acid, and therefore remarkably. An economical process for the production of the corresponding alcohols and / or cyclic ethers from dicarboxylic acids in a two-stage hydrogenation is provided. SOLUTION: In a method for hydrogenating a dicarboxylic acid in two steps to produce a corresponding dialcohol and / or cyclic ether, a metal of group VIII, a group IB, a group VI, A process comprising using a catalyst comprising a metal selected from the group consisting of Group B and Group VII B, and using a catalyst comprising copper in the second stage hydrogenation. |