PATENTS

      1605.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Treating Carbonaceous Matter.]  French Patent 841,898. May 31, 1939.  Chem. Abs., vol. 34. 1940. p. 4544.

            Particularly good results are obtained in the treatment of carbonaceous matter by using mixed catalysts prepared by precipitating metallic compounds from corresponding salt solutions, which have been previously mixed with substances analogous to gels obtained by treating salt solutions containing Si, Ti, Zr, Ce, Th, or Al with an appropriate precipitating agent.  Thus, the gel of silic acid obtained by the addition of an acid to a water-glass solution or aluminium gel obtained by the addition of NH4OH to Al nitrate is mixed with a solution of 1 or more salts of metals belonging to the groups 2-8 of the periodic, table and the mixture is treated with an appropriate precipitating agent such as NH3 (NH4)2CO3, (NH4)2S, or an aqueous solution of a caustic alkali.  As metallic constituents, Mg, Sn, Zn, Fe, Cr, Ni, Co, and Al are particularly indicated.  Among examples, a solution of 50 cc. HCl, mixed with a solution of 2,750 gm. Al(NO3)3∙9 H2O in 8 1. H2O and treated with NH4OH.  The precipitate obtained containing 66% Al2O3 and 34% SiO2 is used as a catalyst in the cracking of paraffin oils, at 460º, with the resulting yield of 30% motor spirit.

            See also Belgian Patent 429,626 (ABS. 1214).