PATENTS

3097.----- [RUHRCHEMIE, A. G.]  [Process for Separating  soda Soaps From Soap Mixtures Containing Hydrocarbons.]  German patent Appl. --, R 640, filed Nov. 4, 1942.  FIAT Reel K-30, frames 7,596-7,599; PB 73,587; YOM Reel 36, bag 3,454, item 36, 4 pp.; Meyer Transl. PC-S-IV, Was Oxidation, vol. 1, chap. 11, 1948, p. 28.

In separating soda soaps from soap mixtures containing hydrocarbons but no free alkali hydroxides, an amount of H₂O or aqueous alcohol mixture is used which is 10-15 times > the weight of the soap mixture  itself.  To prevent foaming of the mixture or the formation of emulsions, 10-15% of the ethyl alcohol is added. Example:  A synthesized mixture of soda soaps and aliphatic hydrocarbons consisting of about 25 kg. of soda soaps and 30 kg. of paraffin hydrocarbons, C₁₀—C₁₈, are mixed with 200 1. of H₂O and 40 1. of 50% ethyl alcohol, and the mixture is stirred well for 10 min.  The liquid is then heated to about 60°, whereupon 2sharply defined layers separate, the upper consisting of neutral oil, which is separated, and the lower of an aqueous alcohol soap solution, from which the alcohol soap solution, from which the alcohol is separated by distillation.  The soap is then salted out from the alcohol free aqueous soap solution.  About 24 kg. of raw soap, containing only 1.2% of neutral oil, is obtained.