2986. -----.[RUHRCHEMIE, A.G.] [Obtaining Lubricants.]  Belgian Patent 418,594, Apr. 30, 1937; appl. filed Nov. 25, 1936, in Germany Dec. 20, 1935. Chem. Zentralb. 1938, I, p.513.

The catalyst used f\or the condensation can be used again by adding small amounts of fresh catalyst and raising the reaction temperature above that of the previous condensation.  Addition to Belgian Patent 416,717 (abs.3151).