PATENTS

      1400.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Preparation of Waxy Substances.]  German Patent Appl. I 74,553. OZ 14,060, filed Mar. 10, 1943 (Cl. IV d-12 6)  FIAT Reel 169, frames 8,601-8,604: PB 25,613: Meyer Transl. PC-S-IV. Wax Oxidation. Vol. 3. chap. 53. 1949. p. 43.

            Fatty acid mixtures or fractions thereof. B. > about 240º under 1 mm. Pressure and obtained by the oxidation of high molecular weight aliphatic hydrocarbons, are esterfied with high molecular weight alcohols, which have been obtained by the hydrogenation of this acid mixture or of the constituents b. about 160º-240º under 1 mm. pressure.  Example: 1,000 parts of a hydrocarbon mixture, prepared by hydrogenation of CO and having a M. p. of 95º, is oxidized with air at 115º in presence of 0.2% Mn state up to an acid number of 50.  The product is saponified with NaOH solution: the unsaponifiable portions being extracted from the soap solution with benzine and returned to the oxidation zone.  H₂SO₄ is added to the soap solution and the resulting acid mixture distilled under 1 mm. Pressure with the addition of small amounts of steam.  The fractions b. >240º are separated and 1.2 is converted into alcohols by hydrogenation under pressure.  Acids and alcohols are then mixed and heated to 150º with the addition of 40 parts xylene.  The esterfication is complete after 6 hr., giving 580 parts of a wax with drop point of 93º.