3308.     STUHLPFARRER, -----.  [Catalytic Cracking of Hydrocarbons.]  FIAT Reel K-28, frames 6232-6259, Aug. 26, 1940, PB  70,185-s; TOM Reel 295.

                    It is desired to crack Diesel oils from the Fischer-Tropsch synthesis consisting of predominantly unbranched paraffins with 11-18 C atoms into hydrocarbons with 3-5 C atoms by polymerization by which antiknock gasolines can be obtained.  The production of CH₄ and C₂ hydrocarbons is to be avoided.  In the apparatus described, natural and synthetic Al hydrosilicates were tested as catalysts and compared.  Best results were obtained with those of Al₂O₃-4 SiO₂ composition.  For the production of large amounts of unsaturated hydrocarbons, the catalysts must contain dehydrogenating additions such as Cr and Ba oxides.  1 diagram, 12 tables.

        STURKEY, L.  See abs. 1390.

        SUCKSMITH, W.  See abs. 635, 2694, 2695.