PATENT

4014.  [Regenerating Used Hydrogenation Catalysts.] German Patent Appl. B 201,899, PA 292,062, Mar. 23, 1943. FIAT Reel B 196, frames 743-745; PB 83,253.

Method is given for regenerating used Co hydrogenation catalysts by dissolving them in HNO3 after removal of the greater part of the organic substances by treating while warm, with solvents, gases or vapors. Before the catalysts are dissolved in acid at temperatures < about 700° they are oxidized with air by this means a considerable saving of acid is reported.