3164.----- [RUHRCHEMIE, A. G.] [Purifying Aldehydes and Ketones] German Patent Appl. --, R 512, filed May 10, 1940. FIAT Reel K-20, frames 295-298; PB 70,211.

Aldehydes and ketones, obtained by the catalytic reaction of water gas with unsaturated C compounds, are treated with aqueous solution of inorganic or organic acids and salts under any pressure and at temperatures below the boiling point. In doing so, concentration, temperature, and duration must be chosen so that the refractive index of the liquid remains virtually constant.