PATENTS

3178.----- [RUHRCHEMIE, A. G.]   [Regenerating Catalysts].  German Patent Appl. R 103,371, filed Sept. 20, 1938 (Cl. IV b-12 n).  PB Report 412, May 15, 1945.

Calcium impurity in Co nitrate solution prepared in reworking catalysts is precipitated by a soluble fluoride in the presence of added Mg (nitrate).  Any excess of soluble fluoride over that required to precipitate Ca will precipitate as Mg F2, thus leaving no fluoride when Na2CO3 is added.