PATENT

3166. ----- [RUHRCHEMIE, A.G.] [Recovery of Carboxylic Acids.] German Patent Appl. R 116,742, no date (Cl. iv a-23 d). Auszüge deut. Patent-Anmeldungen, vol. 6, p. 837.

Carboxylic acids or their derivatives are recovered from the alkali liquor concentrates by melting the mixture, distilling, and finally treating in a finely divided from.  Distillation is stopped when, by slow cooling, 5-20% of the melted mass separates out in the form of an oily upper layer.  Addition to German Patent Appl. R 115,996 (abs. 3083).