PATENTS

      1557.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Separating the Unsaponifiable Components From Sulfochlorinated Mixtures.]  French Patent 52,734.  May 17, 1945: appl. filed Jan. 26, 1943. in Germany Jan. 3. 1942: addition to French Patent 879,513.  Chem. Zentralb., 1949. II. E. p. 90.

            The method of the main patent, wherein liquid SO₂ is used to separate the unsaponifiable constituents, is improved by the subsequent or simultaneous application of a volatile or liquid hydrocarbon.  Example: A hydrocarbon b. 240º-360º obtained by the hydrogenation of CO is sulfochlorinated.  The product contains 4.5% of hydrolysable Cl.  After adding about 3.7 times amount of liquid SO₂, stratification takes place.  The lower layer after evaporation of the SO₂ contains 12.5% of saponifiable and 5.7% of unsaponifiable constituents.  After renewed treatment with 1.5 times the amount of liquid butane at -20º and subsequent stratification, the lower layer contains a product with only 0.8% unsaponifiables and 14.9% of hydrolysable Cl.

            See also German Patent 715,323 (abs. 1561).