PATENTS

      195.            BLANCHARD, D. W., LAUER, G. G., AND PRATT, R. S. (M. W. Kellogg Co.).  Separations of Aldehydes and Ketones.  United States Patent 2,552,513, May 15, 1951; appl. filed July 24, 1948, Serial No. 40,618; 11 claims (Cl. 260-450).

Substituted ammonias from the group consisting of hydroxylamine, hydrazine, and their salts are used to treat a hydrocarbon mixture containing nonacid oxygenated compounds produced by the hydrogenation of C oxides to selectively remove aldehydes from the mixture and thus facilitate subsequent separation of remaining ketones.  This treatment converts the aldehydes and a minor portion of ketones to their corresponding oximes.  The whole reaction mixture is then neutralized and subjected to a distillation procedure that separates the high-boiling oxime fraction from the rest of the hydrocarbons, which are relatively lowboiling.  The oxime fraction is next acidified to convert the oximes to their corresponding pure aldehydes and ketones, which are then separated from the resulting reaction  product by distillation.  The low-boiling hydrocarbon mixture can be subjected to any known process, such as distillation or chromatographic absorption, to effect separation of pure keotones that have not entered into the previous oxime reaction.  2 United States patents and 1 literature ref. Cited.