PATENTS

      1517.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Purification of Synthetic Products.]  French Patent 650,543. Mar. 7, 1928.  Chem. Abs., vol. 23, 1929, p. 3236.

            Synthetic substances such as MeOH, iso-BuOH, are purified by treatment with oxidizing agents, for example KMnO₄, if necessary with the addition of alkalies or organic bases and metal halides, with or without treatment with active purifying agents.