PATENTS

3078.----- [RUHRCHEMIE, A. G.]  [Process for Producing Valuable Monocarboxylic Acids by Oxidation of High-Boiling Paraffin Hydrocarbons.]  German Patent Appl. R 113,913, R 630, PA 602,820, filed Aug. 31, 1942 (Cl. 12 o-11).  FIAT Reel B-196, frames 331,335; PB 83,253; TOM Reel 36, bag 3,454, item 36; Meyer Transl. PC-S-IV, Wax Oxidation, vol. 2, ch. 24, 1948, p.20.

In a process for producing valuable monocarboxylic acids through oxidation of high-boiling paraffins that had been previously dehydrogenated by reaction with had been previously dehydrogenated by reaction with halogens, such as Br or Cl, the dehydrogenation is carried out at temperatures of 250°-300°, preferably at atmospheric or subatmospheric pressure in the presence of catalysts, which induce a shift of the existing double bonds.  The oxidation takes place in known manner by of O₂ or O₂-containing gases in the presence of oxidation promoters.  Artificial or natural Al or Mg silicates, preferably activated bleaching earths or borates or phosphates, which if desired are activated with metal compounds of groups 3-8 are used as catalysts during the reaction with halogens.  Directly combined with the dehydrogenation through cooling to about 100°, the halogen hydrides and the existing cracked products up to and including the C₇ fractions are separated from the higher-boiling fractions by condensation.  then, without further temperature change, the oxidation of the olefinic hydrocarbon mixture takes place.