PATENTS

      1606.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Treatment of Sulfonate Solutions.]  French Patent 899,332, May 28, 1945: appl. filed Oct 30, 1943: in Germany Aug. 8, 1942.  Chem. Zentralb., 1949, I, p. E 14.

            Describes method for working up the mixtures obtained by the saponification of the sulfochlorinated products of Fischer-Tropsch hydrocarbons b. 230º-320º and the separation of the sulfonates from the unsaponified and other impurities.  A recovery of 98% of the crude sulfonates as a pure product is reported.